diff --git a/src/Testing/PHPUnit/ResourceTestCase.php b/src/Testing/PHPUnit/ResourceTestCase.php
index 1b1b19f0..751b2b26 100644
--- a/src/Testing/PHPUnit/ResourceTestCase.php
+++ b/src/Testing/PHPUnit/ResourceTestCase.php
@@ -14,7 +14,7 @@
 use Mockery\Adapter\Phpunit\MockeryTestCaseSetUp;
 
 /**
- * @template TEntity of object
+ * @template TEntity
  */
 abstract class ResourceTestCase extends AssertExpectationTestCase
 {
@@ -44,15 +44,15 @@ protected function mockeryTestTearDown(): void
     }
 
     /**
-     * @param TEntity $object
+     * @param TEntity|callable():TEntity $object
      * @param array<string|int, mixed>  $expected
      * @param TestingContainer|null $container Set container to the resource.
      */
-    protected function assert(object $object, array $expected, ?TestingContainer $container = null): void
+    protected function assert(mixed $object, array $expected, ?TestingContainer $container = null): void
     {
         $request = new Request();
 
-        $resource = $this->createResource($object);
+        $resource = $this->createResource(is_callable($object) ? $object() : $object);
 
         if ($resource instanceof LaraStrictJsonResource && $container !== null) {
             $resource->setContainer($container);
@@ -64,5 +64,5 @@ protected function assert(object $object, array $expected, ?TestingContainer $co
     /**
      * @param TEntity $object
      */
-    abstract protected function createResource(object $object): JsonResource;
+    abstract protected function createResource(mixed $object): JsonResource;
 }
diff --git a/tests/Unit/Testing/PHPUnit/LaraStrictResourceTestCaseTest.php b/tests/Unit/Testing/PHPUnit/LaraStrictResourceTestCaseTest.php
index bc24b190..bd2591eb 100644
--- a/tests/Unit/Testing/PHPUnit/LaraStrictResourceTestCaseTest.php
+++ b/tests/Unit/Testing/PHPUnit/LaraStrictResourceTestCaseTest.php
@@ -42,7 +42,7 @@ protected function myAssert(string $value, string $instance): void
         );
     }
 
-    protected function createResource(object $object): JsonResource
+    protected function createResource(mixed $object): JsonResource
     {
         return new LaraStrictResource($object);
     }
diff --git a/tests/Unit/Testing/PHPUnit/LaravelResourceTestCaseTest.php b/tests/Unit/Testing/PHPUnit/LaravelResourceTestCaseTest.php
index 304cbf09..fd724c5b 100644
--- a/tests/Unit/Testing/PHPUnit/LaravelResourceTestCaseTest.php
+++ b/tests/Unit/Testing/PHPUnit/LaravelResourceTestCaseTest.php
@@ -31,7 +31,7 @@ public function data(): array
         ];
     }
 
-    protected function createResource(object $object): JsonResource
+    protected function createResource(mixed $object): JsonResource
     {
         return new LaravelResource($object);
     }
diff --git a/tests/Unit/Testing/PHPUnit/ModelResourceTestCaseTest.php b/tests/Unit/Testing/PHPUnit/ModelResourceTestCaseTest.php
index a1292379..525b1d96 100644
--- a/tests/Unit/Testing/PHPUnit/ModelResourceTestCaseTest.php
+++ b/tests/Unit/Testing/PHPUnit/ModelResourceTestCaseTest.php
@@ -32,7 +32,7 @@ public function data(): array
         ];
     }
 
-    protected function createResource(object $object): JsonResource
+    protected function createResource(mixed $object): JsonResource
     {
         return new ModelResource($object);
     }