feat: adds toHaveNonPublicConstructor expectation

src/Expectation.php

@@ -1043,6 +1043,29 @@ public function toHaveAttribute(string $attribute): ArchExpectation
         );
     }
 
+    /**
+     * Asserts that the given expectation target has a non-public constructor method.
+     */
+    public function toHaveNonPublicConstructor(): ArchExpectation
+    {
+        $callback = function (ObjectDescription $object): bool {
+            $constructor = $object->reflectionClass->getConstructor();
+
+            if ($constructor === null) {
+                return false;
+            }
+
+            return ! $constructor->isPublic();
+        };
+
+        return Targeted::make(
+            $this,
+            $callback,
+            'to have non-public constructor',
+            FileLineFinder::where(fn (string $line): bool => str_contains($line, '__construct')),
+        );
+    }
+
     /**
      * Asserts that the given expectation target has a constructor method.
      */

tests/Features/Expect/toHaveNonPublicConstructor.php

@@ -0,0 +1,13 @@
+<?php
+
+test('class has private constructor')
+    ->expect('Tests\Fixtures\Arch\ToHaveNonPublicConstructor\HasPrivateConstructor')
+    ->toHaveNonPublicConstructor();
+
+test('class has protected constructor')
+    ->expect('Tests\Fixtures\Arch\ToHaveNonPublicConstructor\HasProtectedConstructor')
+    ->toHaveNonPublicConstructor();
+
+test('class has public constructor')
+    ->expect('Tests\Fixtures\Arch\ToHaveConstructor\HasConstructor\HasConstructor')
+    ->not->toHaveNonPublicConstructor();

tests/Fixtures/Arch/ToHaveNonPublicConstructor/HasPrivateConstructor.php

@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Arch\ToHaveNonPublicConstructor;
+
+class HasPrivateConstructor
+{
+    private function __construct() {}
+}

tests/Fixtures/Arch/ToHaveNonPublicConstructor/HasProtectedConstructor.php

@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Fixtures\Arch\ToHaveNonPublicConstructor;
+
+class HasProtectedConstructor
+{
+    protected function __construct() {}
+}