diff --git a/composer.json b/composer.json
index c65e35dfab46..049d54b86461 100644
--- a/composer.json
+++ b/composer.json
@@ -77,7 +77,8 @@
             "Rector\\Legacy\\": "packages/Legacy/src",
             "Rector\\ElasticSearchDSL\\": "packages/ElasticSearchDSL/src",
             "Rector\\SymfonyPHPUnit\\": "packages/SymfonyPHPUnit/src",
-            "Rector\\Architecture\\": "packages/Architecture/src"
+            "Rector\\Architecture\\": "packages/Architecture/src",
+            "Rector\\PHPUnitSymfony\\": "packages/PHPUnitSymfony/src"
         }
     },
     "autoload-dev": {
@@ -116,7 +117,8 @@
             "Rector\\Legacy\\Tests\\": "packages/Legacy/tests",
             "Rector\\ElasticSearchDSL\\Tests\\": "packages/ElasticSearchDSL/tests",
             "Rector\\SymfonyPHPUnit\\Tests\\": "packages/SymfonyPHPUnit/tests",
-            "Rector\\Architecture\\Tests\\": "packages/Architecture/tests"
+            "Rector\\Architecture\\Tests\\": "packages/Architecture/tests",
+            "Rector\\PHPUnitSymfony\\Tests\\": "packages/PHPUnitSymfony/tests"
         },
         "classmap": [
             "packages/Symfony/tests/Rector/FrameworkBundle/AbstractToConstructorInjectionRectorSource",
diff --git a/packages/NodeTypeResolver/src/PerNodeTypeResolver/NameTypeResolver.php b/packages/NodeTypeResolver/src/PerNodeTypeResolver/NameTypeResolver.php
index 1ea1359ed2fc..f7680755f7d1 100644
--- a/packages/NodeTypeResolver/src/PerNodeTypeResolver/NameTypeResolver.php
+++ b/packages/NodeTypeResolver/src/PerNodeTypeResolver/NameTypeResolver.php
@@ -42,7 +42,7 @@ public function resolve(Node $nameNode): array
         return [$fullyQualifiedName];
     }
 
-    private function resolveFullyQualifiedName(Node $nameNode, string $name): ?string
+    private function resolveFullyQualifiedName(Node $nameNode, string $name): string
     {
         if (in_array($name, ['self', 'static', 'this'], true)) {
             /** @var string|null $class */
diff --git a/packages/PHPUnitSymfony/src/Rector/StaticCall/AddMessageToEqualsResponseCodeRector.php b/packages/PHPUnitSymfony/src/Rector/StaticCall/AddMessageToEqualsResponseCodeRector.php
new file mode 100644
index 000000000000..953329f11c1d
--- /dev/null
+++ b/packages/PHPUnitSymfony/src/Rector/StaticCall/AddMessageToEqualsResponseCodeRector.php
@@ -0,0 +1,132 @@
+<?php declare(strict_types=1);
+
+namespace Rector\PHPUnitSymfony\Rector\StaticCall;
+
+use PhpParser\Node;
+use PhpParser\Node\Arg;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\ClassConstFetch;
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Expr\Variable;
+use Rector\Rector\AbstractRector;
+use Rector\RectorDefinition\CodeSample;
+use Rector\RectorDefinition\RectorDefinition;
+
+/**
+ * @see \Rector\PHPUnitSymfony\Tests\Rector\StaticCall\AddMessageToEqualsResponseCodeRector\AddMessageToEqualsResponseCodeRectorTest
+ */
+final class AddMessageToEqualsResponseCodeRector extends AbstractRector
+{
+    /**
+     * @var string
+     */
+    private const RESPONSE_CLASS = 'Symfony\Component\HttpFoundation\Response';
+
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition('Add response content to response code assert, so it is easier to debug', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Response;
+
+final class SomeClassTest extends TestCase
+{
+    public function test(Response $response)
+    {
+        $this->assertEquals(
+            Response::HTTP_NO_CONTENT,
+            $response->getStatusCode()
+        );
+    }
+}
+CODE_SAMPLE
+                ,
+                <<<'CODE_SAMPLE'
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Response;
+
+final class SomeClassTest extends TestCase
+{
+    public function test(Response $response)
+    {
+        $this->assertEquals(
+            Response::HTTP_NO_CONTENT,
+            $response->getStatusCode()
+            $response->getContent()
+        );
+    }
+}
+CODE_SAMPLE
+            ),
+        ]);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [StaticCall::class, MethodCall::class];
+    }
+
+    /**
+     * @param StaticCall|MethodCall $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if (! $this->isName($node->name, 'assertEquals')) {
+            return null;
+        }
+
+        // already has 3rd "message" argument
+        if (isset($node->args[2])) {
+            return null;
+        }
+
+        if (! $this->isHttpRequestArgument($node->args[0]->value)) {
+            return null;
+        }
+
+        $parentVariable = $this->getParentOfGetStatusCode($node->args[1]->value);
+        if ($parentVariable === null) {
+            return null;
+        }
+
+        $getContentMethodCall = new MethodCall($parentVariable, 'getContent');
+
+        $node->args[2] = new Arg($getContentMethodCall);
+
+        return $node;
+    }
+
+    /**
+     * $this->assertX(Response::SOME_STATUS)
+     */
+    private function isHttpRequestArgument(Node $node): bool
+    {
+        if (! $node instanceof ClassConstFetch) {
+            return false;
+        }
+
+        return $this->isType($node->class, self::RESPONSE_CLASS);
+    }
+
+    /**
+     * @return Variable|MethodCall|Expr|null
+     */
+    private function getParentOfGetStatusCode(Node $node): ?Node
+    {
+        $currentNode = $node;
+        while ($currentNode instanceof MethodCall) {
+            if ($this->isName($currentNode->name, 'getStatusCode')) {
+                return $currentNode->var;
+            }
+
+            $currentNode = $currentNode->var;
+        }
+
+        return null;
+    }
+}
diff --git a/packages/PHPUnitSymfony/tests/Rector/StaticCall/AddMessageToEqualsResponseCodeRector/AddMessageToEqualsResponseCodeRectorTest.php b/packages/PHPUnitSymfony/tests/Rector/StaticCall/AddMessageToEqualsResponseCodeRector/AddMessageToEqualsResponseCodeRectorTest.php
new file mode 100644
index 000000000000..b645a8bf206b
--- /dev/null
+++ b/packages/PHPUnitSymfony/tests/Rector/StaticCall/AddMessageToEqualsResponseCodeRector/AddMessageToEqualsResponseCodeRectorTest.php
@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace Rector\PHPUnitSymfony\Tests\Rector\StaticCall\AddMessageToEqualsResponseCodeRector;
+
+use Rector\PHPUnitSymfony\Rector\StaticCall\AddMessageToEqualsResponseCodeRector;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class AddMessageToEqualsResponseCodeRectorTest extends AbstractRectorTestCase
+{
+    public function test(): void
+    {
+        $this->doTestFiles([__DIR__ . '/Fixture/fixture.php.inc', __DIR__ . '/Fixture/method_call.php.inc']);
+    }
+
+    protected function getRectorClass(): string
+    {
+        return AddMessageToEqualsResponseCodeRector::class;
+    }
+}
diff --git a/packages/PHPUnitSymfony/tests/Rector/StaticCall/AddMessageToEqualsResponseCodeRector/Fixture/fixture.php.inc b/packages/PHPUnitSymfony/tests/Rector/StaticCall/AddMessageToEqualsResponseCodeRector/Fixture/fixture.php.inc
new file mode 100644
index 000000000000..d60f48de019c
--- /dev/null
+++ b/packages/PHPUnitSymfony/tests/Rector/StaticCall/AddMessageToEqualsResponseCodeRector/Fixture/fixture.php.inc
@@ -0,0 +1,53 @@
+<?php
+
+namespace Rector\PHPUnitSymfony\Tests\Rector\StaticCall\AddMessageToEqualsResponseCodeRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Response;
+
+final class SomeClassTest extends TestCase
+{
+    public function test(Response $response)
+    {
+        $this->assertEquals(
+            Response::HTTP_NO_CONTENT,
+            $response->getStatusCode()
+        );
+
+        $anotherName = new Response();
+        $this->assertEquals(
+            Response::HTTP_NO_CONTENT,
+            $anotherName->getStatusCode()
+        );
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\PHPUnitSymfony\Tests\Rector\StaticCall\AddMessageToEqualsResponseCodeRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Response;
+
+final class SomeClassTest extends TestCase
+{
+    public function test(Response $response)
+    {
+        $this->assertEquals(
+            Response::HTTP_NO_CONTENT,
+            $response->getStatusCode(),
+            $response->getContent()
+        );
+
+        $anotherName = new Response();
+        $this->assertEquals(
+            Response::HTTP_NO_CONTENT,
+            $anotherName->getStatusCode(),
+            $anotherName->getContent()
+        );
+    }
+}
+
+?>
diff --git a/packages/PHPUnitSymfony/tests/Rector/StaticCall/AddMessageToEqualsResponseCodeRector/Fixture/method_call.php.inc b/packages/PHPUnitSymfony/tests/Rector/StaticCall/AddMessageToEqualsResponseCodeRector/Fixture/method_call.php.inc
new file mode 100644
index 000000000000..4a0baee4d1bf
--- /dev/null
+++ b/packages/PHPUnitSymfony/tests/Rector/StaticCall/AddMessageToEqualsResponseCodeRector/Fixture/method_call.php.inc
@@ -0,0 +1,48 @@
+<?php
+
+namespace Rector\PHPUnitSymfony\Tests\Rector\StaticCall\AddMessageToEqualsResponseCodeRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Response;
+
+final class MethodCallTest extends TestCase
+{
+    public function test()
+    {
+        $this->assertEquals(
+            Response::HTTP_NO_CONTENT,
+            $this->getResponse()->getStatusCode()
+        );
+    }
+
+    private function getResponse(): Response
+    {
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\PHPUnitSymfony\Tests\Rector\StaticCall\AddMessageToEqualsResponseCodeRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Response;
+
+final class MethodCallTest extends TestCase
+{
+    public function test()
+    {
+        $this->assertEquals(
+            Response::HTTP_NO_CONTENT,
+            $this->getResponse()->getStatusCode(),
+            $this->getResponse()->getContent()
+        );
+    }
+
+    private function getResponse(): Response
+    {
+    }
+}
+
+?>