diff --git a/src/Testing/TestResponse.php b/src/Testing/TestResponse.php
index d2e7f0b..75bcd73 100644
--- a/src/Testing/TestResponse.php
+++ b/src/Testing/TestResponse.php
@@ -29,6 +29,7 @@ class TestResponse
 
     /**
      * TestResponse constructor.
+     *
      * @param Response $baseResponse
      */
     protected function __construct(Response $baseResponse)
@@ -42,7 +43,7 @@ public static function fromBaseResponse(Response $baseResponse)
     }
 
     /**
-     * @return null|Crawler
+     * @return Crawler|null
      */
     public function getCrawler(): ?Crawler
     {
@@ -51,6 +52,7 @@ public function getCrawler(): ?Crawler
 
     /**
      * @param Crawler $crawler
+     *
      * @return TestResponse
      */
     public function setCrawler(Crawler $crawler): self
@@ -77,6 +79,14 @@ public function assertRedirect($expectedLocation = null): self
         return $this;
     }
 
+    public function assertInstanceOf(string $expectedClass)
+    {
+        PHPUnit::assertInstanceOf(
+            $expectedClass,
+            $this->baseResponse
+        );
+    }
+
     public function assertNotFound(): self
     {
         return $this->assertStatusCode(Response::HTTP_NOT_FOUND);
@@ -114,7 +124,7 @@ public function assertSee(string $needle): self
 
     public function assertSeeAll(array $needles): self
     {
-        foreach($needles as $needle) {
+        foreach ($needles as $needle) {
             PHPUnit::assertContains($needle, $this->baseResponse->getContent());
         }
 
@@ -130,7 +140,7 @@ public function assertDontSee(string $needle): self
 
     public function assertDontSeeAny(array $needles)
     {
-        foreach($needles as $needle) {
+        foreach ($needles as $needle) {
             PHPUnit::assertNotContains($needle, $this->baseResponse->getContent());
         }
 
@@ -140,7 +150,7 @@ public function assertDontSeeAny(array $needles)
     public function assertExactJson(array $data): self
     {
         $actual = json_encode(Arr::sortRecursive(
-            (array)$this->decodeResponseJson()
+            (array) $this->decodeResponseJson()
         ));
 
         PHPUnit::assertEquals(json_encode(Arr::sortRecursive($data)), $actual);
@@ -177,7 +187,7 @@ protected function getTwigCollector(): TwigDataCollector
 
     protected function getProfile(): Profile
     {
-        if(!$this->getContainer()->has('profiler')) {
+        if (!$this->getContainer()->has('profiler')) {
             PHPUnit::fail('Profiler is not initialized.');
         }
 
@@ -187,7 +197,7 @@ protected function getProfile(): Profile
     }
 
     /**
-     * @return null|Container
+     * @return Container|null
      */
     public function getContainer(): ?Container
     {
@@ -196,6 +206,7 @@ public function getContainer(): ?Container
 
     /**
      * @param Container $container
+     *
      * @return TestResponse
      */
     public function setContainer(Container $container): self
@@ -214,4 +225,4 @@ public function __call($method, $arguments)
     {
         return $this->baseResponse->{$method}(...$arguments);
     }
-}
\ No newline at end of file
+}
diff --git a/tests/TestResponseTest.php b/tests/TestResponseTest.php
index 2895808..11f8c51 100644
--- a/tests/TestResponseTest.php
+++ b/tests/TestResponseTest.php
@@ -4,8 +4,10 @@
 
 use Gricob\FunctionalTestBundle\Testing\TestResponse;
 use PHPUnit\Framework\AssertionFailedError;
+use PHPUnit\Framework\ExpectationFailedException;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DomCrawler\Crawler;
+use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Response;
 
@@ -19,11 +21,29 @@ public function testAssertOk()
     public function testAssertOkFails()
     {
         $this->expectException(AssertionFailedError::class);
-        $this->expectExceptionMessage("Response status code [500] does not match expected 200 status code.");
+        $this->expectExceptionMessage('Response status code [500] does not match expected 200 status code.');
 
         TestResponse::fromBaseResponse(Response::create('', 500))->assertOk();
     }
 
+    public function testAssertInstanceOfTrue()
+    {
+        TestResponse::fromBaseResponse(JsonResponse::create('', 200))->assertInstanceOf(Response::class);
+    }
+
+    public function testAssertInstanceOfFalse()
+    {
+        $this->expectException(ExpectationFailedException::class);
+        $this->expectExceptionMessage(
+            sprintf(
+                'Failed asserting that %s Object (...) is an instance of class "%s".',
+                Response::class,
+                JsonResponse::class
+            )
+        );
+        TestResponse::fromBaseResponse(Response::create('', 200))->assertInstanceOf(JsonResponse::class);
+    }
+
     public function testAssertRedirectWithExpectedLocation()
     {
         TestResponse::fromBaseResponse(RedirectResponse::create('/test-redirect'))
@@ -39,7 +59,7 @@ public function testAssertRedirectWithoutExpectedLocation()
     public function testAssertRedirectFails()
     {
         $this->expectException(AssertionFailedError::class);
-        $this->expectExceptionMessage("Response redirect location does not match expected [/other-redirect] location");
+        $this->expectExceptionMessage('Response redirect location does not match expected [/other-redirect] location');
 
         TestResponse::fromBaseResponse(RedirectResponse::create('/test-redirect'))
             ->assertRedirect('/other-redirect');
@@ -75,7 +95,7 @@ public function testAssertSeeAll()
         TestResponse::fromBaseResponse(Response::create('Test text in response'))
             ->assertSeeAll([
                 'text',
-                'response'
+                'response',
             ]);
     }
 
@@ -87,7 +107,7 @@ public function testAssertSeeAllFails()
         TestResponse::fromBaseResponse(Response::create('Test text in response'))
             ->assertSeeAll([
                 'text',
-                'this does not exists'
+                'this does not exists',
             ]);
     }
 
@@ -96,7 +116,7 @@ public function testAssertDontSeeAny()
         TestResponse::fromBaseResponse(Response::create('Test text in response'))
             ->assertDontSeeAny([
                 'this does not exists',
-                'this one neither'
+                'this one neither',
             ]);
     }
 
@@ -108,7 +128,7 @@ public function testAssertDontSeeAnyFails()
         TestResponse::fromBaseResponse(Response::create('Test text in response'))
             ->assertDontSeeAny([
                 'text',
-                'this does not exists'
+                'this does not exists',
             ]);
     }
 
@@ -119,15 +139,15 @@ public function testAssertExactJson()
                 'key1' => 'Key 1',
                 'key2' => [
                     10,
-                    30
-                ]
+                    30,
+                ],
             ])))
             ->assertExactJson([
                 'key2' => [
                     30,
-                    10
+                    10,
                 ],
-                'key1' => 'Key 1'
+                'key1' => 'Key 1',
             ]);
     }
 
@@ -144,4 +164,4 @@ public function testGetContent()
 
         $this->assertEquals('Test content', $testResponse->getContent());
     }
-}
\ No newline at end of file
+}