Add property garbage collection

src/PropertyGarbageCollection.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Lendable\PHPUnitExtensions;
+
+use PHPUnit\Framework\Attributes\After;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @mixin TestCase
+ */
+trait PropertyGarbageCollection
+{
+    #[After]
+    final protected function unsetAllProperties(): void
+    {
+        $reflection = new \ReflectionObject($this);
+
+        foreach ($reflection->getProperties() as $property) {
+            if ($property->isStatic() || \str_starts_with($property->getDeclaringClass()->getName(), 'PHPUnit\\')) {
+                continue;
+            }
+
+            unset($this->{$property->getName()}); // @phpstan-ignore-line
+        }
+
+        while (($parent = $reflection->getParentClass()) !== false) {
+            if (\str_starts_with($parent->getName(), 'PHPUnit\\')) {
+                break;
+            }
+
+            foreach ($parent->getProperties() as $property) {
+                if ($property->isStatic() || \str_starts_with($property->getDeclaringClass()->getName(), 'PHPUnit\\')) {
+                    continue;
+                }
+
+                (function () use ($property): void {
+                    unset($this->{$property->getName()}); // @phpstan-ignore-line
+                })->bindTo($this, $parent->getName())->call($this);
+            }
+        }
+
+        \gc_collect_cycles();
+    }
+}

src/TestCase.php

@@ -9,4 +9,5 @@
 abstract class TestCase extends PHPUnitTestCase
 {
     use StrictMocking;
+    use PropertyGarbageCollection;
 }