diff --git a/tests/Unit/Type/Types/ArrayKeyTypeTest.php b/tests/Unit/Type/Types/ArrayKeyTypeTest.php
index 050591ad..0268a54e 100644
--- a/tests/Unit/Type/Types/ArrayKeyTypeTest.php
+++ b/tests/Unit/Type/Types/ArrayKeyTypeTest.php
@@ -11,6 +11,7 @@
 use CuyZ\Valinor\Type\Types\NativeIntegerType;
 use CuyZ\Valinor\Type\Types\NativeStringType;
 use LogicException;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -32,29 +33,37 @@ public function test_string_values_are_correct(): void
         self::assertSame('string', ArrayKeyType::string()->toString());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['accepts' => true, 'value' => 42])]
+    #[TestWith(['accepts' => true, 'value' => 'foo'])]
+    public function test_default_array_key_type_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        $arrayKeyDefault = ArrayKeyType::default();
-        $arrayKeyInteger = ArrayKeyType::integer();
-        $arrayKeyString = ArrayKeyType::string();
-
-        self::assertTrue($arrayKeyDefault->accepts('foo'));
-        self::assertTrue($arrayKeyDefault->accepts(42));
+        self::assertSame($accepts, ArrayKeyType::default()->accepts($value));
+    }
 
-        self::assertFalse($arrayKeyInteger->accepts('foo'));
-        self::assertTrue($arrayKeyInteger->accepts(42));
+    #[TestWith(['accepts' => true, 'value' => 42])]
+    #[TestWith(['accepts' => false, 'value' => 'foo'])]
+    public function test_integer_array_key_type_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        self::assertSame($accepts, ArrayKeyType::integer()->accepts($value));
+    }
 
-        self::assertTrue($arrayKeyString->accepts('foo'));
-        self::assertTrue($arrayKeyString->accepts(42));
+    #[TestWith(['accepts' => true, 'value' => 'foo'])]
+    #[TestWith(['accepts' => true, 'value' => 42])]
+    public function test_string_array_key_type_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        self::assertSame($accepts, ArrayKeyType::string()->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith([42.1337])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse(ArrayKeyType::default()->accepts(null));
-        self::assertFalse(ArrayKeyType::default()->accepts(42.1337));
-        self::assertFalse(ArrayKeyType::default()->accepts(['foo' => 'bar']));
-        self::assertFalse(ArrayKeyType::default()->accepts(false));
-        self::assertFalse(ArrayKeyType::default()->accepts(new stdClass()));
+        self::assertFalse(ArrayKeyType::default()->accepts($value));
+        self::assertFalse(ArrayKeyType::integer()->accepts($value));
+        self::assertFalse(ArrayKeyType::string()->accepts($value));
     }
 
     public function test_default_array_key_can_cast_numeric_and_string_value(): void
diff --git a/tests/Unit/Type/Types/ArrayTypeTest.php b/tests/Unit/Type/Types/ArrayTypeTest.php
index 513dc951..1ec2025a 100644
--- a/tests/Unit/Type/Types/ArrayTypeTest.php
+++ b/tests/Unit/Type/Types/ArrayTypeTest.php
@@ -12,6 +12,7 @@
 use CuyZ\Valinor\Type\Types\MixedType;
 use CuyZ\Valinor\Type\Types\NativeStringType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -71,38 +72,62 @@ public function test_simple_array_subtype_is_correct(): void
         self::assertSame($subType, ArrayType::simple($subType)->subType());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 1337.404]])]
+    public function test_native_array_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        $type = FakeType::accepting('Some value');
+        $type = ArrayType::native();
 
-        $arrayWithDefaultKey = new ArrayType(ArrayKeyType::default(), $type);
-        $arrayWithIntegerKey = new ArrayType(ArrayKeyType::integer(), $type);
-        $arrayWithStringKey = new ArrayType(ArrayKeyType::string(), $type);
+        self::assertSame($accepts, $type->accepts($value));
+    }
+
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 1337.404]])]
+    public function test_default_array_key_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new ArrayType(ArrayKeyType::default(), FakeType::accepting('Some value'));
+
+        self::assertSame($accepts, $type->accepts($value));
+    }
 
-        self::assertTrue($arrayWithDefaultKey->accepts([42 => 'Some value']));
-        self::assertTrue($arrayWithDefaultKey->accepts(['foo' => 'Some value']));
-        self::assertFalse($arrayWithDefaultKey->accepts([42 => 1337.404]));
-        self::assertFalse($arrayWithDefaultKey->accepts(['foo' => 1337.404]));
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 1337.404]])]
+    public function test_integer_array_key_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new ArrayType(ArrayKeyType::integer(), FakeType::accepting('Some value'));
 
-        self::assertTrue($arrayWithIntegerKey->accepts([42 => 'Some value']));
-        self::assertFalse($arrayWithIntegerKey->accepts(['foo' => 'Some value']));
-        self::assertFalse($arrayWithIntegerKey->accepts([42 => 1337.404]));
+        self::assertSame($accepts, $type->accepts($value));
+    }
 
-        self::assertTrue($arrayWithStringKey->accepts([42 => 'Some value']));
-        self::assertTrue($arrayWithStringKey->accepts(['foo' => 'Some value']));
-        self::assertFalse($arrayWithIntegerKey->accepts([42 => 1337.404]));
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 1337.404]])]
+    public function test_string_array_key_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new ArrayType(ArrayKeyType::string(), FakeType::accepting('Some value'));
 
-        self::assertFalse(ArrayType::native()->accepts('foo'));
+        self::assertSame($accepts, $type->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse(ArrayType::native()->accepts(null));
-        self::assertFalse(ArrayType::native()->accepts('Schwifty!'));
-        self::assertFalse(ArrayType::native()->accepts(42.1337));
-        self::assertFalse(ArrayType::native()->accepts(404));
-        self::assertFalse(ArrayType::native()->accepts(false));
-        self::assertFalse(ArrayType::native()->accepts(new stdClass()));
+        self::assertFalse(ArrayType::native()->accepts($value));
+        self::assertFalse((new ArrayType(ArrayKeyType::default(), FakeType::accepting('Some value')))->accepts($value));
+        self::assertFalse((new ArrayType(ArrayKeyType::integer(), FakeType::accepting('Some value')))->accepts($value));
+        self::assertFalse((new ArrayType(ArrayKeyType::string(), FakeType::accepting('Some value')))->accepts($value));
     }
 
     public function test_matches_valid_array_type(): void
diff --git a/tests/Unit/Type/Types/BooleanValueTypeTest.php b/tests/Unit/Type/Types/BooleanValueTypeTest.php
index d0e35f44..a846fc60 100644
--- a/tests/Unit/Type/Types/BooleanValueTypeTest.php
+++ b/tests/Unit/Type/Types/BooleanValueTypeTest.php
@@ -10,6 +10,7 @@
 use CuyZ\Valinor\Type\Types\MixedType;
 use CuyZ\Valinor\Type\Types\NativeBooleanType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -27,29 +28,30 @@ public function test_string_value_is_correct(): void
         self::assertSame('false', BooleanValueType::false()->toString());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['accepts' => true, 'value' => true])]
+    #[TestWith(['accepts' => false, 'value' => false])]
+    public function test_true_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        self::assertTrue(BooleanValueType::true()->accepts(true));
-        self::assertTrue(BooleanValueType::false()->accepts(false));
+        self::assertSame($accepts, BooleanValueType::true()->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith(['accepts' => true, 'value' => false])]
+    #[TestWith(['accepts' => false, 'value' => true])]
+    public function test_false_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        self::assertFalse(BooleanValueType::true()->accepts('Schwifty!'));
-        self::assertFalse(BooleanValueType::true()->accepts(42.1337));
-        self::assertFalse(BooleanValueType::true()->accepts(404));
-        self::assertFalse(BooleanValueType::true()->accepts(['foo' => 'bar']));
-        self::assertFalse(BooleanValueType::true()->accepts(false));
-        self::assertFalse(BooleanValueType::true()->accepts(null));
-        self::assertFalse(BooleanValueType::true()->accepts(new stdClass()));
+        self::assertSame($accepts, BooleanValueType::false()->accepts($value));
+    }
 
-        self::assertFalse(BooleanValueType::false()->accepts('Schwifty!'));
-        self::assertFalse(BooleanValueType::false()->accepts(42.1337));
-        self::assertFalse(BooleanValueType::false()->accepts(404));
-        self::assertFalse(BooleanValueType::false()->accepts(['foo' => 'bar']));
-        self::assertFalse(BooleanValueType::false()->accepts(true));
-        self::assertFalse(BooleanValueType::false()->accepts(null));
-        self::assertFalse(BooleanValueType::false()->accepts(new stdClass()));
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([null])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
+    {
+        self::assertFalse(BooleanValueType::true()->accepts($value));
+        self::assertFalse(BooleanValueType::false()->accepts($value));
     }
 
     public function test_can_cast_boolean_value(): void
diff --git a/tests/Unit/Type/Types/CallableTypeTest.php b/tests/Unit/Type/Types/CallableTypeTest.php
index e9bcb15f..770cf921 100644
--- a/tests/Unit/Type/Types/CallableTypeTest.php
+++ b/tests/Unit/Type/Types/CallableTypeTest.php
@@ -9,6 +9,7 @@
 use CuyZ\Valinor\Type\Types\CallableType;
 use CuyZ\Valinor\Type\Types\MixedType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -30,15 +31,16 @@ public function test_accepts_correct_values(): void
         self::assertTrue($this->callableType->accepts(fn () => null));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([true])]
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->callableType->accepts(true));
-        self::assertFalse($this->callableType->accepts(null));
-        self::assertFalse($this->callableType->accepts('Schwifty!'));
-        self::assertFalse($this->callableType->accepts(42.1337));
-        self::assertFalse($this->callableType->accepts(404));
-        self::assertFalse($this->callableType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->callableType->accepts(new stdClass()));
+        self::assertFalse($this->callableType->accepts($value));
     }
 
     public function test_string_value_is_correct(): void
diff --git a/tests/Unit/Type/Types/ClassStringTypeTest.php b/tests/Unit/Type/Types/ClassStringTypeTest.php
index 857d012f..37142201 100644
--- a/tests/Unit/Type/Types/ClassStringTypeTest.php
+++ b/tests/Unit/Type/Types/ClassStringTypeTest.php
@@ -19,6 +19,7 @@
 use DateTime;
 use DateTimeImmutable;
 use DateTimeInterface;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -51,57 +52,46 @@ public function test_union_with_invalid_type_throws_exception(): void
         new ClassStringType($type);
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([stdClass::class])]
+    #[TestWith([DateTimeInterface::class])]
+    public function test_basic_class_string_accepts_correct_values(mixed $value): void
     {
-        $classStringType = new ClassStringType();
-
-        self::assertTrue($classStringType->accepts(stdClass::class));
-        self::assertTrue($classStringType->accepts(DateTimeInterface::class));
-    }
-
-    public function test_does_not_accept_incorrect_values(): void
-    {
-        $classStringType = new ClassStringType();
-
-        self::assertFalse($classStringType->accepts(null));
-        self::assertFalse($classStringType->accepts('Schwifty!'));
-        self::assertFalse($classStringType->accepts(42.1337));
-        self::assertFalse($classStringType->accepts(404));
-        self::assertFalse($classStringType->accepts(['foo' => 'bar']));
-        self::assertFalse($classStringType->accepts(false));
-        self::assertFalse($classStringType->accepts(new stdClass()));
+        self::assertTrue((new ClassStringType())->accepts($value));
     }
 
-    public function test_accepts_correct_values_with_sub_type(): void
+    #[TestWith(['accepts' => true, 'value' => DateTime::class])]
+    #[TestWith(['accepts' => true, 'value' => DateTimeImmutable::class])]
+    #[TestWith(['accepts' => true, 'value' => DateTimeInterface::class])]
+    #[TestWith(['accepts' => false, 'value' => stdClass::class])]
+    public function test_object_class_string_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        $objectType = new FakeObjectType(DateTimeInterface::class);
-        $classStringType = new ClassStringType($objectType);
-
-        self::assertTrue($classStringType->accepts(DateTime::class));
-        self::assertTrue($classStringType->accepts(DateTimeImmutable::class));
-        self::assertTrue($classStringType->accepts(DateTimeInterface::class));
+        $type = new ClassStringType(new FakeObjectType(DateTimeInterface::class));
 
-        self::assertFalse($classStringType->accepts(stdClass::class));
+        self::assertSame($accepts, $type->accepts($value));
     }
 
-    public function test_accepts_correct_values_with_union_sub_type(): void
+    #[TestWith(['accepts' => true, 'value' => DateTime::class])]
+    #[TestWith(['accepts' => true, 'value' => stdClass::class])]
+    #[TestWith(['accepts' => false, 'value' => DateTimeImmutable::class])]
+    public function test_union_of_objects_class_string_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        $type = new UnionType(new FakeObjectType(DateTimeInterface::class), new FakeObjectType(stdClass::class));
-        $classStringType = new ClassStringType($type);
+        $type = new ClassStringType(new UnionType(new FakeObjectType(DateTime::class), new FakeObjectType(stdClass::class)));
 
-        self::assertTrue($classStringType->accepts(DateTime::class));
-        self::assertTrue($classStringType->accepts(DateTimeImmutable::class));
-        self::assertTrue($classStringType->accepts(DateTimeInterface::class));
-
-        self::assertTrue($classStringType->accepts(stdClass::class));
+        self::assertSame($accepts, $type->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values_with_union_sub_type(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        $unionType = new UnionType(new FakeObjectType(DateTime::class), new FakeObjectType(stdClass::class));
-        $classStringType = new ClassStringType($unionType);
-
-        self::assertFalse($classStringType->accepts(DateTimeImmutable::class));
+        self::assertFalse((new ClassStringType())->accepts($value));
+        self::assertFalse((new ClassStringType(new FakeObjectType()))->accepts($value));
+        self::assertFalse((new ClassStringType(new UnionType(new FakeObjectType(), new FakeObjectType())))->accepts($value));
     }
 
     public function test_can_cast_stringable_value(): void
diff --git a/tests/Unit/Type/Types/EnumTypeTest.php b/tests/Unit/Type/Types/EnumTypeTest.php
index b906a3bb..65634d98 100644
--- a/tests/Unit/Type/Types/EnumTypeTest.php
+++ b/tests/Unit/Type/Types/EnumTypeTest.php
@@ -12,6 +12,7 @@
 use CuyZ\Valinor\Type\Types\EnumType;
 use CuyZ\Valinor\Type\Types\UndefinedObjectType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -39,41 +40,42 @@ public function test_class_name_can_be_retrieved(): void
         self::assertSame(BackedIntegerEnum::class, $this->backedIntegerEnumType->className());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['accepts' => true, 'value' => PureEnum::FOO])]
+    #[TestWith(['accepts' => false, 'value' => BackedStringEnum::FOO])]
+    #[TestWith(['accepts' => false, 'value' => BackedIntegerEnum::FOO])]
+    public function test_pure_enum_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        self::assertTrue($this->pureEnumType->accepts(PureEnum::FOO));
-        self::assertTrue($this->backedStringEnumType->accepts(BackedStringEnum::FOO));
-        self::assertTrue($this->backedIntegerEnumType->accepts(BackedIntegerEnum::FOO));
+        self::assertSame($accepts, $this->pureEnumType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith(['accepts' => true, 'value' => BackedStringEnum::FOO])]
+    #[TestWith(['accepts' => false, 'value' => PureEnum::FOO])]
+    #[TestWith(['accepts' => false, 'value' => BackedIntegerEnum::FOO])]
+    public function test_backed_string_enum_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        self::assertFalse($this->pureEnumType->accepts(null));
-        self::assertFalse($this->pureEnumType->accepts('Schwifty!'));
-        self::assertFalse($this->pureEnumType->accepts(42.1337));
-        self::assertFalse($this->pureEnumType->accepts(404));
-        self::assertFalse($this->pureEnumType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->pureEnumType->accepts(false));
-        self::assertFalse($this->pureEnumType->accepts(new stdClass()));
-        self::assertFalse($this->pureEnumType->accepts(BackedIntegerEnum::FOO));
-
-        self::assertFalse($this->backedStringEnumType->accepts(null));
-        self::assertFalse($this->backedStringEnumType->accepts('Schwifty!'));
-        self::assertFalse($this->backedStringEnumType->accepts(42.1337));
-        self::assertFalse($this->backedStringEnumType->accepts(404));
-        self::assertFalse($this->backedStringEnumType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->backedStringEnumType->accepts(false));
-        self::assertFalse($this->backedStringEnumType->accepts(new stdClass()));
-        self::assertFalse($this->backedStringEnumType->accepts(PureEnum::FOO));
-
-        self::assertFalse($this->backedIntegerEnumType->accepts(null));
-        self::assertFalse($this->backedIntegerEnumType->accepts('Schwifty!'));
-        self::assertFalse($this->backedIntegerEnumType->accepts(42.1337));
-        self::assertFalse($this->backedIntegerEnumType->accepts(404));
-        self::assertFalse($this->backedIntegerEnumType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->backedIntegerEnumType->accepts(false));
-        self::assertFalse($this->backedIntegerEnumType->accepts(new stdClass()));
-        self::assertFalse($this->backedIntegerEnumType->accepts(BackedStringEnum::FOO));
+        self::assertSame($accepts, $this->backedStringEnumType->accepts($value));
+    }
+
+    #[TestWith(['accepts' => true, 'value' => BackedIntegerEnum::FOO])]
+    #[TestWith(['accepts' => false, 'value' => PureEnum::FOO])]
+    #[TestWith(['accepts' => false, 'value' => BackedStringEnum::FOO])]
+    public function test_backed_integer_enum_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        self::assertSame($accepts, $this->backedIntegerEnumType->accepts($value));
+    }
+
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
+    {
+        self::assertFalse($this->pureEnumType->accepts($value));
+        self::assertFalse($this->backedStringEnumType->accepts($value));
+        self::assertFalse($this->backedIntegerEnumType->accepts($value));
     }
 
     public function test_string_value_is_correct(): void
diff --git a/tests/Unit/Type/Types/FloatValueTypeTest.php b/tests/Unit/Type/Types/FloatValueTypeTest.php
index e70591d0..51bb3e25 100644
--- a/tests/Unit/Type/Types/FloatValueTypeTest.php
+++ b/tests/Unit/Type/Types/FloatValueTypeTest.php
@@ -10,6 +10,7 @@
 use CuyZ\Valinor\Type\Types\MixedType;
 use CuyZ\Valinor\Type\Types\NativeFloatType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -29,20 +30,22 @@ public function test_value_can_be_retrieved(): void
         self::assertSame(1337.42, $this->floatValueType->value());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([1337.42])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->floatValueType->accepts(1337.42));
+        self::assertTrue($this->floatValueType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([404])]
+    #[TestWith([404.42])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->floatValueType->accepts(null));
-        self::assertFalse($this->floatValueType->accepts('Schwifty!'));
-        self::assertFalse($this->floatValueType->accepts(404));
-        self::assertFalse($this->floatValueType->accepts(404.42));
-        self::assertFalse($this->floatValueType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->floatValueType->accepts(false));
-        self::assertFalse($this->floatValueType->accepts(new stdClass()));
+        self::assertFalse($this->floatValueType->accepts($value));
     }
 
     public function test_can_cast_float_value(): void
diff --git a/tests/Unit/Type/Types/IntegerRangeTypeTest.php b/tests/Unit/Type/Types/IntegerRangeTypeTest.php
index 9ba9a508..abbe2856 100644
--- a/tests/Unit/Type/Types/IntegerRangeTypeTest.php
+++ b/tests/Unit/Type/Types/IntegerRangeTypeTest.php
@@ -15,6 +15,7 @@
 use CuyZ\Valinor\Type\Types\PositiveIntegerType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -47,23 +48,25 @@ public function test_range_with_same_min_greater_than_max_throws_exception(): vo
         new IntegerRangeType(1337, 42);
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([-42])]
+    #[TestWith([0])]
+    #[TestWith([42])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->type->accepts(-42));
-        self::assertTrue($this->type->accepts(0));
-        self::assertTrue($this->type->accepts(42));
+        self::assertTrue($this->type->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([-1337])]
+    #[TestWith([1337])]
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->type->accepts(-1337));
-        self::assertFalse($this->type->accepts(1337));
-        self::assertFalse($this->type->accepts(null));
-        self::assertFalse($this->type->accepts('Schwifty!'));
-        self::assertFalse($this->type->accepts(42.1337));
-        self::assertFalse($this->type->accepts(['foo' => 'bar']));
-        self::assertFalse($this->type->accepts(false));
-        self::assertFalse($this->type->accepts(new stdClass()));
+        self::assertFalse($this->type->accepts($value));
     }
 
     public function test_can_cast_integer_value(): void
diff --git a/tests/Unit/Type/Types/IntegerValueTypeTest.php b/tests/Unit/Type/Types/IntegerValueTypeTest.php
index cdd81d9a..92589e36 100644
--- a/tests/Unit/Type/Types/IntegerValueTypeTest.php
+++ b/tests/Unit/Type/Types/IntegerValueTypeTest.php
@@ -13,6 +13,7 @@
 use CuyZ\Valinor\Type\Types\PositiveIntegerType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -32,21 +33,23 @@ public function test_value_can_be_retrieved(): void
         self::assertSame(1337, $this->type->value());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([1337])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->type->accepts(1337));
+        self::assertTrue($this->type->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([404])]
+    #[TestWith([-404])]
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->type->accepts(404));
-        self::assertFalse($this->type->accepts(-404));
-        self::assertFalse($this->type->accepts(null));
-        self::assertFalse($this->type->accepts('Schwifty!'));
-        self::assertFalse($this->type->accepts(42.1337));
-        self::assertFalse($this->type->accepts(['foo' => 'bar']));
-        self::assertFalse($this->type->accepts(false));
-        self::assertFalse($this->type->accepts(new stdClass()));
+        self::assertFalse($this->type->accepts($value));
     }
 
     public function test_can_cast_integer_value(): void
diff --git a/tests/Unit/Type/Types/InterfaceTypeTest.php b/tests/Unit/Type/Types/InterfaceTypeTest.php
index 9f2837dd..7ffb5e97 100644
--- a/tests/Unit/Type/Types/InterfaceTypeTest.php
+++ b/tests/Unit/Type/Types/InterfaceTypeTest.php
@@ -15,6 +15,7 @@
 use DateTimeImmutable;
 use DateTimeInterface;
 use Iterator;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -35,25 +36,27 @@ public function test_string_value_is_correct(): void
         self::assertSame(stdClass::class . "<{$generic->toString()}>", $type->toString());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([new DateTime()])]
+    #[TestWith([new DateTimeImmutable()])]
+    public function test_accepts_correct_values(mixed $value): void
     {
         $type = new InterfaceType(DateTimeInterface::class);
 
-        self::assertTrue($type->accepts(new DateTime()));
-        self::assertTrue($type->accepts(new DateTimeImmutable()));
+        self::assertTrue($type->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
         $type = new InterfaceType(DateTimeInterface::class);
 
-        self::assertFalse($type->accepts(null));
-        self::assertFalse($type->accepts('Schwifty!'));
-        self::assertFalse($type->accepts(42.1337));
-        self::assertFalse($type->accepts(404));
-        self::assertFalse($type->accepts(['foo' => 'bar']));
-        self::assertFalse($type->accepts(false));
-        self::assertFalse($type->accepts(new stdClass()));
+        self::assertFalse($type->accepts($value));
     }
 
     public function test_matches_other_identical_interface(): void
diff --git a/tests/Unit/Type/Types/IntersectionTypeTest.php b/tests/Unit/Type/Types/IntersectionTypeTest.php
index 5f41767a..7d540e35 100644
--- a/tests/Unit/Type/Types/IntersectionTypeTest.php
+++ b/tests/Unit/Type/Types/IntersectionTypeTest.php
@@ -10,6 +10,7 @@
 use CuyZ\Valinor\Type\Types\IntersectionType;
 use CuyZ\Valinor\Type\Types\MixedType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -58,21 +59,18 @@ public function test_accepts_correct_values(): void
         self::assertTrue($intersectionType->accepts($object));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        $typeA = new FakeObjectType();
-        $typeB = new FakeObjectType();
-        $typeC = new FakeObjectType();
-
-        $intersectionType = new IntersectionType($typeA, $typeB, $typeC);
+        $intersectionType = new IntersectionType(new FakeObjectType(), new FakeObjectType());
 
-        self::assertFalse($intersectionType->accepts(null));
-        self::assertFalse($intersectionType->accepts('Schwifty!'));
-        self::assertFalse($intersectionType->accepts(42.1337));
-        self::assertFalse($intersectionType->accepts(404));
-        self::assertFalse($intersectionType->accepts(['foo' => 'bar']));
-        self::assertFalse($intersectionType->accepts(false));
-        self::assertFalse($intersectionType->accepts(new stdClass()));
+        self::assertFalse($intersectionType->accepts($value));
     }
 
     public function test_matches_valid_type(): void
diff --git a/tests/Unit/Type/Types/IterableTypeTest.php b/tests/Unit/Type/Types/IterableTypeTest.php
index e057f206..d1ef094e 100644
--- a/tests/Unit/Type/Types/IterableTypeTest.php
+++ b/tests/Unit/Type/Types/IterableTypeTest.php
@@ -7,11 +7,13 @@
 use CuyZ\Valinor\Tests\Fake\Type\FakeCompositeType;
 use CuyZ\Valinor\Tests\Fake\Type\FakeType;
 use CuyZ\Valinor\Type\Types\ArrayKeyType;
-use CuyZ\Valinor\Type\Types\NativeStringType;
 use CuyZ\Valinor\Type\Types\IterableType;
 use CuyZ\Valinor\Type\Types\MixedType;
+use CuyZ\Valinor\Type\Types\NativeStringType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
+use stdClass;
 
 final class IterableTypeTest extends TestCase
 {
@@ -55,38 +57,90 @@ public function test_subtype_is_correct(): void
         self::assertSame($subType, (new IterableType(ArrayKeyType::default(), $subType))->subType());
     }
 
-    public function test_accepts_correct_values(): void
+    public function test_accepts_generators_with_correct_values(): void
     {
         $type = FakeType::accepting('Some value');
 
+        $iterableNative = IterableType::native();
         $iterableWithDefaultKey = new IterableType(ArrayKeyType::default(), $type);
         $iterableWithIntegerKey = new IterableType(ArrayKeyType::integer(), $type);
         $iterableWithStringKey = new IterableType(ArrayKeyType::string(), $type);
 
-        self::assertTrue($iterableWithDefaultKey->accepts([42 => 'Some value']));
-        self::assertTrue($iterableWithDefaultKey->accepts(['foo' => 'Some value']));
-        self::assertFalse($iterableWithDefaultKey->accepts([42 => 1337.404]));
-        self::assertFalse($iterableWithDefaultKey->accepts(['foo' => 1337.404]));
         self::assertTrue($iterableWithDefaultKey->accepts((static fn () => yield 42 => 'Some value')()));
         self::assertTrue($iterableWithDefaultKey->accepts((static fn () => yield 'foo' => 'Some value')()));
         self::assertFalse($iterableWithDefaultKey->accepts((static fn () => yield 42 => 1337.404)()));
         self::assertFalse($iterableWithDefaultKey->accepts((static fn () => yield 'foo' => 1337.404)()));
 
-        self::assertTrue($iterableWithIntegerKey->accepts([42 => 'Some value']));
-        self::assertFalse($iterableWithIntegerKey->accepts(['foo' => 'Some value']));
-        self::assertFalse($iterableWithIntegerKey->accepts([42 => 1337.404]));
         self::assertTrue($iterableWithIntegerKey->accepts((static fn () => yield 42 => 'Some value')()));
         self::assertFalse($iterableWithIntegerKey->accepts((static fn () => yield 'foo' => 'Some value')()));
         self::assertFalse($iterableWithIntegerKey->accepts((static fn () => yield 42 => 1337.404)()));
 
-        self::assertTrue($iterableWithStringKey->accepts([42 => 'Some value']));
-        self::assertTrue($iterableWithStringKey->accepts(['foo' => 'Some value']));
-        self::assertFalse($iterableWithIntegerKey->accepts([42 => 1337.404]));
         self::assertTrue($iterableWithStringKey->accepts((static fn () => yield 42 => 'Some value')()));
         self::assertTrue($iterableWithStringKey->accepts((static fn () => yield 'foo' => 'Some value')()));
         self::assertFalse($iterableWithStringKey->accepts((static fn () => yield 42 => 1337.404)()));
 
-        self::assertFalse(IterableType::native()->accepts('foo'));
+        self::assertTrue($iterableNative->accepts((static fn () => yield 42 => 'Some value')()));
+        self::assertTrue($iterableNative->accepts((static fn () => yield 'foo' => 'Some value')()));
+        self::assertTrue($iterableNative->accepts((static fn () => yield 42 => 1337.404)()));
+        self::assertTrue($iterableNative->accepts((static fn () => yield 'foo' => 1337.404)()));
+    }
+
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 1337.404]])]
+    public function test_native_array_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = IterableType::native();
+
+        self::assertSame($accepts, $type->accepts($value));
+    }
+
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 1337.404]])]
+    public function test_default_array_key_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new IterableType(ArrayKeyType::default(), FakeType::accepting('Some value'));
+
+        self::assertSame($accepts, $type->accepts($value));
+    }
+
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 1337.404]])]
+    public function test_integer_array_key_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new IterableType(ArrayKeyType::integer(), FakeType::accepting('Some value'));
+
+        self::assertSame($accepts, $type->accepts($value));
+    }
+
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 1337.404]])]
+    public function test_string_array_key_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new IterableType(ArrayKeyType::string(), FakeType::accepting('Some value'));
+
+        self::assertSame($accepts, $type->accepts($value));
+    }
+
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
+    {
+        self::assertFalse(IterableType::native()->accepts($value));
+        self::assertFalse((new IterableType(ArrayKeyType::default(), FakeType::accepting('Some value')))->accepts($value));
+        self::assertFalse((new IterableType(ArrayKeyType::integer(), FakeType::accepting('Some value')))->accepts($value));
+        self::assertFalse((new IterableType(ArrayKeyType::string(), FakeType::accepting('Some value')))->accepts($value));
     }
 
     public function test_matches_valid_iterable_type(): void
diff --git a/tests/Unit/Type/Types/ListTypeTest.php b/tests/Unit/Type/Types/ListTypeTest.php
index faaabc58..25d982f7 100644
--- a/tests/Unit/Type/Types/ListTypeTest.php
+++ b/tests/Unit/Type/Types/ListTypeTest.php
@@ -13,6 +13,7 @@
 use CuyZ\Valinor\Type\Types\MixedType;
 use CuyZ\Valinor\Type\Types\NativeStringType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -57,34 +58,38 @@ public function test_subtype_is_correct(): void
         self::assertSame($subType, (new ListType($subType))->subType());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['accepts' => true, 'value' => []])]
+    #[TestWith(['accepts' => true, 'value' => ['Some value', 'Some value', 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['Some value', 'Schwifty!', 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [1 => 'Some value', 2 => 'Some value']])]
+    public function test_native_list_type_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        $type = FakeType::accepting('Some value');
+        self::assertSame($accepts, ListType::native()->accepts($value));
+    }
 
-        self::assertTrue((new ListType($type))->accepts([
-            'Some value',
-            'Some value',
-            'Some value',
-        ]));
+    #[TestWith(['accepts' => true, 'value' => []])]
+    #[TestWith(['accepts' => true, 'value' => ['Some value', 'Some value', 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => ['Some value', 'Schwifty!', 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [1 => 'Some value', 2 => 'Some value']])]
+    public function test_list_of_type_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new ListType(FakeType::accepting('Some value'));
 
-        self::assertFalse((new ListType($type))->accepts([
-            'Some value',
-            'Schwifty!',
-            'Some value',
-        ]));
+        self::assertSame($accepts, $type->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([[1 => 'foo']])]
+    #[TestWith([['foo' => 'foo']])]
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse(ListType::native()->accepts([1 => 'foo']));
-        self::assertFalse(ListType::native()->accepts(['foo' => 'foo']));
-
-        self::assertFalse(ListType::native()->accepts(null));
-        self::assertFalse(ListType::native()->accepts('Schwifty!'));
-        self::assertFalse(ListType::native()->accepts(42.1337));
-        self::assertFalse(ListType::native()->accepts(404));
-        self::assertFalse(ListType::native()->accepts(false));
-        self::assertFalse(ListType::native()->accepts(new stdClass()));
+        self::assertFalse(ListType::native()->accepts($value));
+        self::assertFalse((new ListType(FakeType::accepting('Some value')))->accepts($value));
     }
 
     public function test_matches_valid_list_type(): void
diff --git a/tests/Unit/Type/Types/MixedTypeTest.php b/tests/Unit/Type/Types/MixedTypeTest.php
index 4f14427c..9a388c6c 100644
--- a/tests/Unit/Type/Types/MixedTypeTest.php
+++ b/tests/Unit/Type/Types/MixedTypeTest.php
@@ -7,6 +7,7 @@
 use CuyZ\Valinor\Tests\Fake\Type\FakeType;
 use CuyZ\Valinor\Tests\Traits\TestIsSingleton;
 use CuyZ\Valinor\Type\Types\MixedType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -28,15 +29,16 @@ public function test_string_value_is_correct(): void
         self::assertSame('mixed', $this->mixedType->toString());
     }
 
-    public function test_accepts_every_value(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_accepts_every_value(mixed $value): void
     {
-        self::assertTrue($this->mixedType->accepts(null));
-        self::assertTrue($this->mixedType->accepts('Schwifty!'));
-        self::assertTrue($this->mixedType->accepts(42.1337));
-        self::assertTrue($this->mixedType->accepts(404));
-        self::assertTrue($this->mixedType->accepts(['foo' => 'bar']));
-        self::assertTrue($this->mixedType->accepts(false));
-        self::assertTrue($this->mixedType->accepts(new stdClass()));
+        self::assertTrue($this->mixedType->accepts($value));
     }
 
     public function test_matches_same_type(): void
diff --git a/tests/Unit/Type/Types/NativeBooleanTypeTest.php b/tests/Unit/Type/Types/NativeBooleanTypeTest.php
index d73d1ee8..e6a3f1ad 100644
--- a/tests/Unit/Type/Types/NativeBooleanTypeTest.php
+++ b/tests/Unit/Type/Types/NativeBooleanTypeTest.php
@@ -11,6 +11,7 @@
 use CuyZ\Valinor\Type\Types\NativeBooleanType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -27,20 +28,22 @@ protected function setUp(): void
         $this->booleanType = new NativeBooleanType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([true])]
+    #[TestWith([false])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->booleanType->accepts(true));
-        self::assertTrue($this->booleanType->accepts(false));
+        self::assertTrue($this->booleanType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->booleanType->accepts(null));
-        self::assertFalse($this->booleanType->accepts('Schwifty!'));
-        self::assertFalse($this->booleanType->accepts(42.1337));
-        self::assertFalse($this->booleanType->accepts(404));
-        self::assertFalse($this->booleanType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->booleanType->accepts(new stdClass()));
+        self::assertFalse($this->booleanType->accepts($value));
     }
 
     public function test_can_cast_boolean_value(): void
diff --git a/tests/Unit/Type/Types/NativeClassTypeTest.php b/tests/Unit/Type/Types/NativeClassTypeTest.php
index 53245af0..7cd151e8 100644
--- a/tests/Unit/Type/Types/NativeClassTypeTest.php
+++ b/tests/Unit/Type/Types/NativeClassTypeTest.php
@@ -12,6 +12,7 @@
 use CuyZ\Valinor\Type\Types\UnionType;
 use DateTime;
 use DateTimeInterface;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -32,22 +33,26 @@ public function test_string_value_is_signature(): void
         self::assertSame(stdClass::class . "<{$generic->toString()}>", $type->toString());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([new stdClass()])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue((new NativeClassType(stdClass::class))->accepts(new stdClass()));
+        $type = new NativeClassType(stdClass::class);
+
+        self::assertTrue($type->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new DateTime()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
         $type = new NativeClassType(stdClass::class);
 
-        self::assertFalse($type->accepts(null));
-        self::assertFalse($type->accepts('Schwifty!'));
-        self::assertFalse($type->accepts(42.1337));
-        self::assertFalse($type->accepts(404));
-        self::assertFalse($type->accepts(['foo' => 'bar']));
-        self::assertFalse($type->accepts(false));
-        self::assertFalse($type->accepts(new DateTime()));
+        self::assertFalse($type->accepts($value));
     }
 
     public function test_matches_other_identical_class(): void
diff --git a/tests/Unit/Type/Types/NativeFloatTypeTest.php b/tests/Unit/Type/Types/NativeFloatTypeTest.php
index fe1623cd..1a01a8ff 100644
--- a/tests/Unit/Type/Types/NativeFloatTypeTest.php
+++ b/tests/Unit/Type/Types/NativeFloatTypeTest.php
@@ -11,6 +11,7 @@
 use CuyZ\Valinor\Type\Types\NativeFloatType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -27,19 +28,21 @@ protected function setUp(): void
         $this->floatType = new NativeFloatType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([42.1337])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->floatType->accepts(42.1337));
+        self::assertTrue($this->floatType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->floatType->accepts(null));
-        self::assertFalse($this->floatType->accepts('Schwifty!'));
-        self::assertFalse($this->floatType->accepts(404));
-        self::assertFalse($this->floatType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->floatType->accepts(false));
-        self::assertFalse($this->floatType->accepts(new stdClass()));
+        self::assertFalse($this->floatType->accepts($value));
     }
 
     public function test_can_cast_float_value(): void
diff --git a/tests/Unit/Type/Types/NativeIntegerTypeTest.php b/tests/Unit/Type/Types/NativeIntegerTypeTest.php
index f3d12759..0857e246 100644
--- a/tests/Unit/Type/Types/NativeIntegerTypeTest.php
+++ b/tests/Unit/Type/Types/NativeIntegerTypeTest.php
@@ -11,6 +11,7 @@
 use CuyZ\Valinor\Type\Types\NativeIntegerType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -27,21 +28,23 @@ protected function setUp(): void
         $this->integerType = new NativeIntegerType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([404])]
+    #[TestWith([-404])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->integerType->accepts(404));
-        self::assertTrue($this->integerType->accepts(-404));
+        self::assertTrue($this->integerType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([-42.1337])]
+    #[TestWith([42.1337])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->integerType->accepts(null));
-        self::assertFalse($this->integerType->accepts('Schwifty!'));
-        self::assertFalse($this->integerType->accepts(-42.1337));
-        self::assertFalse($this->integerType->accepts(42.1337));
-        self::assertFalse($this->integerType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->integerType->accepts(false));
-        self::assertFalse($this->integerType->accepts(new stdClass()));
+        self::assertFalse($this->integerType->accepts($value));
     }
 
     public function test_can_cast_integer_value(): void
diff --git a/tests/Unit/Type/Types/NativeStringTypeTest.php b/tests/Unit/Type/Types/NativeStringTypeTest.php
index bb876904..73fec19d 100644
--- a/tests/Unit/Type/Types/NativeStringTypeTest.php
+++ b/tests/Unit/Type/Types/NativeStringTypeTest.php
@@ -12,6 +12,7 @@
 use CuyZ\Valinor\Type\Types\NativeStringType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -28,19 +29,21 @@ protected function setUp(): void
         $this->stringType = new NativeStringType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['Schwifty!'])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->stringType->accepts('Schwifty!'));
+        self::assertTrue($this->stringType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->stringType->accepts(null));
-        self::assertFalse($this->stringType->accepts(42.1337));
-        self::assertFalse($this->stringType->accepts(404));
-        self::assertFalse($this->stringType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->stringType->accepts(false));
-        self::assertFalse($this->stringType->accepts(new stdClass()));
+        self::assertFalse($this->stringType->accepts($value));
     }
 
     public function test_can_cast_stringable_value(): void
diff --git a/tests/Unit/Type/Types/NegativeIntegerTypeTest.php b/tests/Unit/Type/Types/NegativeIntegerTypeTest.php
index ef42727e..b4a9c91e 100644
--- a/tests/Unit/Type/Types/NegativeIntegerTypeTest.php
+++ b/tests/Unit/Type/Types/NegativeIntegerTypeTest.php
@@ -13,6 +13,7 @@
 use CuyZ\Valinor\Type\Types\PositiveIntegerType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -29,21 +30,23 @@ protected function setUp(): void
         $this->negativeIntegerType = new NegativeIntegerType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([-404])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->negativeIntegerType->accepts(-404));
+        self::assertTrue($this->negativeIntegerType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([0])]
+    #[TestWith([404])]
+    #[TestWith([42.1337])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->negativeIntegerType->accepts(null));
-        self::assertFalse($this->negativeIntegerType->accepts('Schwifty!'));
-        self::assertFalse($this->negativeIntegerType->accepts(0));
-        self::assertFalse($this->negativeIntegerType->accepts(404));
-        self::assertFalse($this->negativeIntegerType->accepts(42.1337));
-        self::assertFalse($this->negativeIntegerType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->negativeIntegerType->accepts(false));
-        self::assertFalse($this->negativeIntegerType->accepts(new stdClass()));
+        self::assertFalse($this->negativeIntegerType->accepts($value));
     }
 
     public function test_can_cast_integer_value(): void
diff --git a/tests/Unit/Type/Types/NonEmptyArrayTypeTest.php b/tests/Unit/Type/Types/NonEmptyArrayTypeTest.php
index 0be46e4d..3dfddc3e 100644
--- a/tests/Unit/Type/Types/NonEmptyArrayTypeTest.php
+++ b/tests/Unit/Type/Types/NonEmptyArrayTypeTest.php
@@ -11,6 +11,7 @@
 use CuyZ\Valinor\Type\Types\NativeStringType;
 use CuyZ\Valinor\Type\Types\NonEmptyArrayType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -56,39 +57,63 @@ public function test_subtype_is_correct(): void
         self::assertSame($subType, (new NonEmptyArrayType(ArrayKeyType::default(), $subType))->subType());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 1337.404]])]
+    public function test_native_array_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        $type = FakeType::accepting('Some value');
+        $type = NonEmptyArrayType::native();
 
-        $arrayWithDefaultKey = new NonEmptyArrayType(ArrayKeyType::default(), $type);
-        $arrayWithIntegerKey = new NonEmptyArrayType(ArrayKeyType::integer(), $type);
-        $arrayWithStringKey = new NonEmptyArrayType(ArrayKeyType::string(), $type);
+        self::assertSame($accepts, $type->accepts($value));
+    }
+
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 1337.404]])]
+    public function test_default_array_key_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new NonEmptyArrayType(ArrayKeyType::default(), FakeType::accepting('Some value'));
+
+        self::assertSame($accepts, $type->accepts($value));
+    }
 
-        self::assertTrue($arrayWithDefaultKey->accepts([42 => 'Some value']));
-        self::assertTrue($arrayWithDefaultKey->accepts(['foo' => 'Some value']));
-        self::assertFalse($arrayWithDefaultKey->accepts([42 => 1337.404]));
-        self::assertFalse($arrayWithDefaultKey->accepts(['foo' => 1337.404]));
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 1337.404]])]
+    public function test_integer_array_key_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new NonEmptyArrayType(ArrayKeyType::integer(), FakeType::accepting('Some value'));
 
-        self::assertTrue($arrayWithIntegerKey->accepts([42 => 'Some value']));
-        self::assertFalse($arrayWithIntegerKey->accepts(['foo' => 'Some value']));
-        self::assertFalse($arrayWithIntegerKey->accepts([42 => 1337.404]));
+        self::assertSame($accepts, $type->accepts($value));
+    }
 
-        self::assertTrue($arrayWithStringKey->accepts([42 => 'Some value']));
-        self::assertTrue($arrayWithStringKey->accepts(['foo' => 'Some value']));
-        self::assertFalse($arrayWithIntegerKey->accepts([42 => 1337.404]));
+    #[TestWith(['accepts' => true, 'value' => [42 => 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['foo' => 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [42 => 1337.404]])]
+    #[TestWith(['accepts' => false, 'value' => ['foo' => 1337.404]])]
+    public function test_string_array_key_accepts_correct_values(bool $accepts, mixed $value): void
+    {
+        $type = new NonEmptyArrayType(ArrayKeyType::string(), FakeType::accepting('Some value'));
 
-        self::assertFalse(NonEmptyArrayType::native()->accepts('foo'));
+        self::assertSame($accepts, $type->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([[]])]
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse(NonEmptyArrayType::native()->accepts([]));
-        self::assertFalse(NonEmptyArrayType::native()->accepts(null));
-        self::assertFalse(NonEmptyArrayType::native()->accepts('Schwifty!'));
-        self::assertFalse(NonEmptyArrayType::native()->accepts(42.1337));
-        self::assertFalse(NonEmptyArrayType::native()->accepts(404));
-        self::assertFalse(NonEmptyArrayType::native()->accepts(false));
-        self::assertFalse(NonEmptyArrayType::native()->accepts(new stdClass()));
+        self::assertFalse(NonEmptyArrayType::native()->accepts($value));
+        self::assertFalse((new NonEmptyArrayType(ArrayKeyType::default(), FakeType::accepting('Some value')))->accepts($value));
+        self::assertFalse((new NonEmptyArrayType(ArrayKeyType::integer(), FakeType::accepting('Some value')))->accepts($value));
+        self::assertFalse((new NonEmptyArrayType(ArrayKeyType::string(), FakeType::accepting('Some value')))->accepts($value));
     }
 
     public function test_matches_valid_array_type(): void
diff --git a/tests/Unit/Type/Types/NonEmptyListTypeTest.php b/tests/Unit/Type/Types/NonEmptyListTypeTest.php
index 46fb6edb..0e82218c 100644
--- a/tests/Unit/Type/Types/NonEmptyListTypeTest.php
+++ b/tests/Unit/Type/Types/NonEmptyListTypeTest.php
@@ -15,6 +15,7 @@
 use CuyZ\Valinor\Type\Types\NonEmptyArrayType;
 use CuyZ\Valinor\Type\Types\NonEmptyListType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -59,35 +60,37 @@ public function test_subtype_is_correct(): void
         self::assertSame($subType, (new NonEmptyListType($subType))->subType());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['accepts' => true, 'value' => ['Some value', 'Some value', 'Some value']])]
+    #[TestWith(['accepts' => true, 'value' => ['Some value', 'Schwifty!', 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [1 => 'Some value', 2 => 'Some value']])]
+    public function test_native_list_type_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        $type = FakeType::accepting('Some value');
-
-        self::assertTrue((new NonEmptyListType($type))->accepts([
-            'Some value',
-            'Some value',
-            'Some value',
-        ]));
-
-        self::assertFalse((new NonEmptyListType($type))->accepts([
-            'Some value',
-            'Schwifty!',
-            'Some value',
-        ]));
+        self::assertSame($accepts, NonEmptyListType::native()->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith(['accepts' => true, 'value' => ['Some value', 'Some value', 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => ['Some value', 'Schwifty!', 'Some value']])]
+    #[TestWith(['accepts' => false, 'value' => [1 => 'Some value', 2 => 'Some value']])]
+    public function test_list_of_type_accepts_correct_values(bool $accepts, mixed $value): void
     {
-        self::assertFalse(NonEmptyListType::native()->accepts([]));
-        self::assertFalse(NonEmptyListType::native()->accepts([1 => 'foo']));
-        self::assertFalse(NonEmptyListType::native()->accepts(['foo' => 'foo']));
-
-        self::assertFalse(NonEmptyListType::native()->accepts(null));
-        self::assertFalse(NonEmptyListType::native()->accepts('Schwifty!'));
-        self::assertFalse(NonEmptyListType::native()->accepts(42.1337));
-        self::assertFalse(NonEmptyListType::native()->accepts(404));
-        self::assertFalse(NonEmptyListType::native()->accepts(false));
-        self::assertFalse(NonEmptyListType::native()->accepts(new stdClass()));
+        $type = new NonEmptyListType(FakeType::accepting('Some value'));
+
+        self::assertSame($accepts, $type->accepts($value));
+    }
+
+    #[TestWith([[]])]
+    #[TestWith([[1 => 'foo']])]
+    #[TestWith([['foo' => 'foo']])]
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
+    {
+        self::assertFalse(NonEmptyListType::native()->accepts($value));
+        self::assertFalse((new NonEmptyListType(FakeType::accepting('Some value')))->accepts($value));
     }
 
     public function test_matches_valid_list_type(): void
diff --git a/tests/Unit/Type/Types/NonEmptyStringTypeTest.php b/tests/Unit/Type/Types/NonEmptyStringTypeTest.php
index 56962983..bfa868b3 100644
--- a/tests/Unit/Type/Types/NonEmptyStringTypeTest.php
+++ b/tests/Unit/Type/Types/NonEmptyStringTypeTest.php
@@ -13,6 +13,7 @@
 use CuyZ\Valinor\Type\Types\NonEmptyStringType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -29,20 +30,22 @@ protected function setUp(): void
         $this->nonEmptyStringType = new NonEmptyStringType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['Schwifty!'])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->nonEmptyStringType->accepts('Schwifty!'));
+        self::assertTrue($this->nonEmptyStringType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith([''])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->nonEmptyStringType->accepts(null));
-        self::assertFalse($this->nonEmptyStringType->accepts(''));
-        self::assertFalse($this->nonEmptyStringType->accepts(42.1337));
-        self::assertFalse($this->nonEmptyStringType->accepts(404));
-        self::assertFalse($this->nonEmptyStringType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->nonEmptyStringType->accepts(false));
-        self::assertFalse($this->nonEmptyStringType->accepts(new stdClass()));
+        self::assertFalse($this->nonEmptyStringType->accepts($value));
     }
 
     public function test_can_cast_stringable_value(): void
diff --git a/tests/Unit/Type/Types/NonNegativeIntegerTypeTest.php b/tests/Unit/Type/Types/NonNegativeIntegerTypeTest.php
index eca0edb9..a99bfad2 100644
--- a/tests/Unit/Type/Types/NonNegativeIntegerTypeTest.php
+++ b/tests/Unit/Type/Types/NonNegativeIntegerTypeTest.php
@@ -13,6 +13,7 @@
 use CuyZ\Valinor\Type\Types\PositiveIntegerType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -29,21 +30,23 @@ protected function setUp(): void
         $this->nonNegativeIntegerType = new NonNegativeIntegerType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([0])]
+    #[TestWith([404])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->nonNegativeIntegerType->accepts(0));
-        self::assertTrue($this->nonNegativeIntegerType->accepts(404));
+        self::assertTrue($this->nonNegativeIntegerType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([-404])]
+    #[TestWith([42.1337])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->nonNegativeIntegerType->accepts(null));
-        self::assertFalse($this->nonNegativeIntegerType->accepts('Schwifty!'));
-        self::assertFalse($this->nonNegativeIntegerType->accepts(-404));
-        self::assertFalse($this->nonNegativeIntegerType->accepts(42.1337));
-        self::assertFalse($this->nonNegativeIntegerType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->nonNegativeIntegerType->accepts(false));
-        self::assertFalse($this->nonNegativeIntegerType->accepts(new stdClass()));
+        self::assertFalse($this->nonNegativeIntegerType->accepts($value));
     }
 
     public function test_can_cast_integer_value(): void
diff --git a/tests/Unit/Type/Types/NonPositiveIntegerTypeTest.php b/tests/Unit/Type/Types/NonPositiveIntegerTypeTest.php
index 7c0b499d..fa24a02b 100644
--- a/tests/Unit/Type/Types/NonPositiveIntegerTypeTest.php
+++ b/tests/Unit/Type/Types/NonPositiveIntegerTypeTest.php
@@ -13,6 +13,7 @@
 use CuyZ\Valinor\Type\Types\PositiveIntegerType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -29,21 +30,23 @@ protected function setUp(): void
         $this->nonPositiveIntegerType = new NonPositiveIntegerType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([0])]
+    #[TestWith([-404])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->nonPositiveIntegerType->accepts(0));
-        self::assertTrue($this->nonPositiveIntegerType->accepts(-404));
+        self::assertTrue($this->nonPositiveIntegerType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([404])]
+    #[TestWith([42.1337])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->nonPositiveIntegerType->accepts(null));
-        self::assertFalse($this->nonPositiveIntegerType->accepts('Schwifty!'));
-        self::assertFalse($this->nonPositiveIntegerType->accepts(404));
-        self::assertFalse($this->nonPositiveIntegerType->accepts(42.1337));
-        self::assertFalse($this->nonPositiveIntegerType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->nonPositiveIntegerType->accepts(false));
-        self::assertFalse($this->nonPositiveIntegerType->accepts(new stdClass()));
+        self::assertFalse($this->nonPositiveIntegerType->accepts($value));
     }
 
     public function test_can_cast_integer_value(): void
diff --git a/tests/Unit/Type/Types/NullTypeTest.php b/tests/Unit/Type/Types/NullTypeTest.php
index 549ba841..aa527754 100644
--- a/tests/Unit/Type/Types/NullTypeTest.php
+++ b/tests/Unit/Type/Types/NullTypeTest.php
@@ -9,6 +9,7 @@
 use CuyZ\Valinor\Type\Types\MixedType;
 use CuyZ\Valinor\Type\Types\NullType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -30,19 +31,21 @@ public function test_string_value_is_correct(): void
         self::assertSame('null', $this->nullType->toString());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([null])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->nullType->accepts(null));
+        self::assertTrue($this->nullType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->nullType->accepts('Schwifty!'));
-        self::assertFalse($this->nullType->accepts(42.1337));
-        self::assertFalse($this->nullType->accepts(404));
-        self::assertFalse($this->nullType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->nullType->accepts(false));
-        self::assertFalse($this->nullType->accepts(new stdClass()));
+        self::assertFalse($this->nullType->accepts($value));
     }
 
     public function test_matches_same_type(): void
diff --git a/tests/Unit/Type/Types/NumericStringTypeTest.php b/tests/Unit/Type/Types/NumericStringTypeTest.php
index 3d6fb273..72343e5e 100644
--- a/tests/Unit/Type/Types/NumericStringTypeTest.php
+++ b/tests/Unit/Type/Types/NumericStringTypeTest.php
@@ -14,6 +14,7 @@
 use CuyZ\Valinor\Type\Types\NumericStringType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -30,21 +31,23 @@ protected function setUp(): void
         $this->numericStringType = new NumericStringType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['777.7'])]
+    #[TestWith(['0'])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->numericStringType->accepts('777.7'));
-        self::assertTrue($this->numericStringType->accepts('0'));
+        self::assertTrue($this->numericStringType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith([''])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->numericStringType->accepts(null));
-        self::assertFalse($this->numericStringType->accepts(''));
-        self::assertFalse($this->numericStringType->accepts(42.1337));
-        self::assertFalse($this->numericStringType->accepts(404));
-        self::assertFalse($this->numericStringType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->numericStringType->accepts(false));
-        self::assertFalse($this->numericStringType->accepts(new stdClass()));
+        self::assertFalse($this->numericStringType->accepts($value));
     }
 
     public function test_can_cast_stringable_value(): void
diff --git a/tests/Unit/Type/Types/PositiveIntegerTypeTest.php b/tests/Unit/Type/Types/PositiveIntegerTypeTest.php
index 72c5368c..6d30e8bc 100644
--- a/tests/Unit/Type/Types/PositiveIntegerTypeTest.php
+++ b/tests/Unit/Type/Types/PositiveIntegerTypeTest.php
@@ -13,6 +13,7 @@
 use CuyZ\Valinor\Type\Types\PositiveIntegerType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -29,21 +30,23 @@ protected function setUp(): void
         $this->positiveIntegerType = new PositiveIntegerType();
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([404])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        self::assertTrue($this->positiveIntegerType->accepts(404));
+        self::assertTrue($this->positiveIntegerType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([0])]
+    #[TestWith([-404])]
+    #[TestWith([42.1337])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->positiveIntegerType->accepts(null));
-        self::assertFalse($this->positiveIntegerType->accepts('Schwifty!'));
-        self::assertFalse($this->positiveIntegerType->accepts(0));
-        self::assertFalse($this->positiveIntegerType->accepts(-404));
-        self::assertFalse($this->positiveIntegerType->accepts(42.1337));
-        self::assertFalse($this->positiveIntegerType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->positiveIntegerType->accepts(false));
-        self::assertFalse($this->positiveIntegerType->accepts(new stdClass()));
+        self::assertFalse($this->positiveIntegerType->accepts($value));
     }
 
     public function test_can_cast_integer_value(): void
diff --git a/tests/Unit/Type/Types/ShapedArrayTypeTest.php b/tests/Unit/Type/Types/ShapedArrayTypeTest.php
index f0ea1293..0a3783aa 100644
--- a/tests/Unit/Type/Types/ShapedArrayTypeTest.php
+++ b/tests/Unit/Type/Types/ShapedArrayTypeTest.php
@@ -19,6 +19,7 @@
 use CuyZ\Valinor\Type\Types\ShapedArrayType;
 use CuyZ\Valinor\Type\Types\StringValueType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -70,33 +71,33 @@ public function test_string_value_is_correct(): void
         self::assertSame("array{foo: string, 1337?: int, ...array<'unsealed-key', float>}", $this->type->toString());
     }
 
-    public function test_accepts_correct_values(): void
+    // Without additional values
+    #[TestWith([['foo' => 'foo', 1337 => 42]])]
+    #[TestWith([['foo' => 'foo']])]
+    // With additional values
+    #[TestWith([['foo' => 'foo', 1337 => 42, 'unsealed-key' => 42.1337]])]
+    #[TestWith([['foo' => 'foo', 'unsealed-key' => 42.1337]])]
+    public function test_accepts_correct_values(mixed $value): void
     {
-        // Without additional values
-        self::assertTrue($this->type->accepts(['foo' => 'foo', 1337 => 42]));
-        self::assertTrue($this->type->accepts(['foo' => 'foo']));
-
-        // With additional values
-        self::assertTrue($this->type->accepts(['foo' => 'foo', 1337 => 42, 'unsealed-key' => 42.1337]));
-        self::assertTrue($this->type->accepts(['foo' => 'foo', 'unsealed-key' => 42.1337]));
+        self::assertTrue($this->type->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    // Without additional values
+    #[TestWith([['foo' => 42]])]
+    #[TestWith([['foo' => new stdClass()]])]
+    #[TestWith([['bar' => 'foo']])]
+    // With invalid additional values
+    #[TestWith([['foo' => 'foo', 42 => '']])]
+    // Others
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        // Without additional values
-        self::assertFalse($this->type->accepts(['foo' => 42]));
-        self::assertFalse($this->type->accepts(['foo' => new stdClass()]));
-        self::assertFalse($this->type->accepts(['bar' => 'foo']));
-
-        // With invalid additional values
-        self::assertFalse($this->type->accepts(['foo' => 'foo', 42 => '']));
-
-        self::assertFalse($this->type->accepts(null));
-        self::assertFalse($this->type->accepts('Schwifty!'));
-        self::assertFalse($this->type->accepts(42.1337));
-        self::assertFalse($this->type->accepts(404));
-        self::assertFalse($this->type->accepts(false));
-        self::assertFalse($this->type->accepts(new stdClass()));
+        self::assertFalse($this->type->accepts($value));
     }
 
     public function test_matches_valid_array_shaped_type(): void
diff --git a/tests/Unit/Type/Types/StringValueTypeTest.php b/tests/Unit/Type/Types/StringValueTypeTest.php
index 019a884a..cf4e1de7 100644
--- a/tests/Unit/Type/Types/StringValueTypeTest.php
+++ b/tests/Unit/Type/Types/StringValueTypeTest.php
@@ -11,6 +11,7 @@
 use CuyZ\Valinor\Type\Types\StringValueType;
 use CuyZ\Valinor\Type\Types\UnionType;
 use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -30,26 +31,28 @@ public function test_value_can_be_retrieved(): void
         self::assertSame('Schwifty!', $this->type->value());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith(['Schwifty!'])]
+    public function test_accepts_correct_values(mixed $value): void
     {
         $type = new StringValueType('Schwifty!');
         $typeSingleQuote = StringValueType::from("'Schwifty!'");
         $typeDoubleQuote = StringValueType::from('"Schwifty!"');
 
-        self::assertTrue($type->accepts('Schwifty!'));
-        self::assertTrue($typeSingleQuote->accepts('Schwifty!'));
-        self::assertTrue($typeDoubleQuote->accepts('Schwifty!'));
+        self::assertTrue($type->accepts($value));
+        self::assertTrue($typeSingleQuote->accepts($value));
+        self::assertTrue($typeDoubleQuote->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith(['other string'])]
+    #[TestWith([null])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->type->accepts('other string'));
-        self::assertFalse($this->type->accepts(null));
-        self::assertFalse($this->type->accepts(42.1337));
-        self::assertFalse($this->type->accepts(404));
-        self::assertFalse($this->type->accepts(['foo' => 'bar']));
-        self::assertFalse($this->type->accepts(false));
-        self::assertFalse($this->type->accepts(new stdClass()));
+        self::assertFalse($this->type->accepts($value));
     }
 
     public function test_can_cast_stringable_value(): void
diff --git a/tests/Unit/Type/Types/UndefinedObjectTypeTest.php b/tests/Unit/Type/Types/UndefinedObjectTypeTest.php
index d908fc89..3b52fa42 100644
--- a/tests/Unit/Type/Types/UndefinedObjectTypeTest.php
+++ b/tests/Unit/Type/Types/UndefinedObjectTypeTest.php
@@ -11,6 +11,7 @@
 use CuyZ\Valinor\Type\Types\MixedType;
 use CuyZ\Valinor\Type\Types\UndefinedObjectType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -38,14 +39,15 @@ public function test_accepts_correct_values(): void
         self::assertTrue($this->undefinedObjectType->accepts(new class () {}));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        self::assertFalse($this->undefinedObjectType->accepts(null));
-        self::assertFalse($this->undefinedObjectType->accepts('Schwifty!'));
-        self::assertFalse($this->undefinedObjectType->accepts(42.1337));
-        self::assertFalse($this->undefinedObjectType->accepts(404));
-        self::assertFalse($this->undefinedObjectType->accepts(['foo' => 'bar']));
-        self::assertFalse($this->undefinedObjectType->accepts(false));
+        self::assertFalse($this->undefinedObjectType->accepts($value));
     }
 
     public function test_matches_valid_types(): void
diff --git a/tests/Unit/Type/Types/UnionTypeTest.php b/tests/Unit/Type/Types/UnionTypeTest.php
index 2face8aa..4c015d91 100644
--- a/tests/Unit/Type/Types/UnionTypeTest.php
+++ b/tests/Unit/Type/Types/UnionTypeTest.php
@@ -9,6 +9,7 @@
 use CuyZ\Valinor\Type\Types\Exception\ForbiddenMixedType;
 use CuyZ\Valinor\Type\Types\MixedType;
 use CuyZ\Valinor\Type\Types\UnionType;
+use PHPUnit\Framework\Attributes\TestWith;
 use PHPUnit\Framework\TestCase;
 use stdClass;
 
@@ -62,34 +63,32 @@ public function test_to_string_returns_correct_value(): void
         self::assertSame("{$typeA->toString()}|{$typeB->toString()}|{$typeC->toString()}", $unionType->toString());
     }
 
-    public function test_accepts_correct_values(): void
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith(['foo'])]
+    public function test_accepts_correct_values(mixed $value): void
     {
         $typeA = FakeType::accepting(42.1337);
-        $typeB = FakeType::accepting('foo');
-        $typeC = FakeType::accepting($object = new stdClass());
+        $typeB = FakeType::accepting(404);
+        $typeC = FakeType::accepting('foo');
 
         $unionType = new UnionType($typeA, $typeB, $typeC);
 
-        self::assertTrue($unionType->accepts(42.1337));
-        self::assertTrue($unionType->accepts('foo'));
-        self::assertTrue($unionType->accepts($object));
+        self::assertTrue($unionType->accepts($value));
     }
 
-    public function test_does_not_accept_incorrect_values(): void
+    #[TestWith([null])]
+    #[TestWith(['Schwifty!'])]
+    #[TestWith([42.1337])]
+    #[TestWith([404])]
+    #[TestWith([['foo' => 'bar']])]
+    #[TestWith([false])]
+    #[TestWith([new stdClass()])]
+    public function test_does_not_accept_incorrect_values(mixed $value): void
     {
-        $typeA = new FakeType();
-        $typeB = new FakeType();
-        $typeC = new FakeType();
-
-        $unionType = new UnionType($typeA, $typeB, $typeC);
+        $unionType = new UnionType(new FakeType(), new FakeType(), new FakeType());
 
-        self::assertFalse($unionType->accepts(null));
-        self::assertFalse($unionType->accepts('Schwifty!'));
-        self::assertFalse($unionType->accepts(42.1337));
-        self::assertFalse($unionType->accepts(404));
-        self::assertFalse($unionType->accepts(['foo' => 'bar']));
-        self::assertFalse($unionType->accepts(false));
-        self::assertFalse($unionType->accepts(new stdClass()));
+        self::assertFalse($unionType->accepts($value));
     }
 
     public function test_matches_valid_type(): void