diff --git a/tests/Assets/DeprecatedEnum.php b/tests/assets_/DeprecatedEnum.php
similarity index 84%
rename from tests/Assets/DeprecatedEnum.php
rename to tests/assets_/DeprecatedEnum.php
index 4480b38..e0c8a84 100644
--- a/tests/Assets/DeprecatedEnum.php
+++ b/tests/assets_/DeprecatedEnum.php
@@ -1,6 +1,6 @@
 <?php declare(strict_types=1);
 
-namespace MabeEnum\PHPStan\tests\assets;
+namespace MabeEnum\PHPStan\tests\assets_;
 
 use MabeEnum\Enum;
 
diff --git a/tests/Assets/DocCommentEnum.php b/tests/assets_/DocCommentEnum.php
similarity index 85%
rename from tests/Assets/DocCommentEnum.php
rename to tests/assets_/DocCommentEnum.php
index 5864523..31bf257 100644
--- a/tests/Assets/DocCommentEnum.php
+++ b/tests/assets_/DocCommentEnum.php
@@ -1,6 +1,6 @@
 <?php declare(strict_types=1);
 
-namespace MabeEnum\PHPStan\tests\assets;
+namespace MabeEnum\PHPStan\tests\assets_;
 
 use MabeEnum\Enum;
 
diff --git a/tests/Assets/NotAnEnum.php b/tests/assets_/NotAnEnum.php
similarity index 88%
rename from tests/Assets/NotAnEnum.php
rename to tests/assets_/NotAnEnum.php
index cb73beb..33ef22f 100644
--- a/tests/Assets/NotAnEnum.php
+++ b/tests/assets_/NotAnEnum.php
@@ -1,6 +1,6 @@
 <?php declare(strict_types=1);
 
-namespace MabeEnum\PHPStan\tests\assets;
+namespace MabeEnum\PHPStan\tests\assets_;
 
 class NotAnEnum
 {
diff --git a/tests/Assets/VisibilityEnum.php b/tests/assets_/VisibilityEnum.php
similarity index 92%
rename from tests/Assets/VisibilityEnum.php
rename to tests/assets_/VisibilityEnum.php
index bbc107d..76770c8 100644
--- a/tests/Assets/VisibilityEnum.php
+++ b/tests/assets_/VisibilityEnum.php
@@ -1,6 +1,6 @@
 <?php declare(strict_types=1);
 
-namespace MabeEnum\PHPStan\tests\assets;
+namespace MabeEnum\PHPStan\tests\assets_;
 
 use MabeEnum\Enum;
 
diff --git a/tests/unit/EnumMethodReflectionTest.php b/tests/unit/EnumMethodReflectionTest.php
index b8654e5..0593538 100644
--- a/tests/unit/EnumMethodReflectionTest.php
+++ b/tests/unit/EnumMethodReflectionTest.php
@@ -4,10 +4,10 @@
 
 use MabeEnumPHPStan\EnumMethodReflection;
 use MabeEnumPHPStan\EnumMethodsClassReflectionExtension;
-use MabeEnum\PHPStan\tests\assets\DeprecatedEnum;
-use MabeEnum\PHPStan\tests\assets\DocCommentEnum;
-use MabeEnum\PHPStan\tests\assets\NotAnEnum;
-use MabeEnum\PHPStan\tests\assets\VisibilityEnum;
+use MabeEnum\PHPStan\tests\assets_\DeprecatedEnum;
+use MabeEnum\PHPStan\tests\assets_\DocCommentEnum;
+use MabeEnum\PHPStan\tests\assets_\NotAnEnum;
+use MabeEnum\PHPStan\tests\assets_\VisibilityEnum;
 use PHPStan\Reflection\ParametersAcceptorSelector;
 use PHPStan\Testing\TestCase;
 use PHPStan\TrinaryLogic;
diff --git a/tests/unit/EnumMethodsClassReflectionExtensionTest.php b/tests/unit/EnumMethodsClassReflectionExtensionTest.php
index fb4f9d3..a031620 100644
--- a/tests/unit/EnumMethodsClassReflectionExtensionTest.php
+++ b/tests/unit/EnumMethodsClassReflectionExtensionTest.php
@@ -4,8 +4,8 @@
 
 use MabeEnumPHPStan\EnumMethodReflection;
 use MabeEnumPHPStan\EnumMethodsClassReflectionExtension;
-use MabeEnum\PHPStan\tests\assets\NotAnEnum;
-use MabeEnum\PHPStan\tests\assets\VisibilityEnum;
+use MabeEnum\PHPStan\tests\assets_\NotAnEnum;
+use MabeEnum\PHPStan\tests\assets_\VisibilityEnum;
 use PHPStan\Reflection\ParametersAcceptorSelector;
 use PHPStan\Testing\TestCase;
 use PHPStan\Type\VerbosityLevel;