diff --git a/rules-tests/CodeQuality/Rector/MethodCall/AssertEqualsToSameRector/Fixture/skip.php b/rules-tests/CodeQuality/Rector/MethodCall/AssertEqualsToSameRector/Fixture/skip.php
new file mode 100644
index 00000000..1a7b0b71
--- /dev/null
+++ b/rules-tests/CodeQuality/Rector/MethodCall/AssertEqualsToSameRector/Fixture/skip.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\AssertEqualsToSameRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+final class MySkipTest extends TestCase
+{
+    public function test()
+    {
+        $null = null;
+        $expectedNull = null;
+        $this->assertEquals($expectedNull, $null);
+
+        $bool = true;
+        $expectedBool = true;
+        $this->assertEquals($expectedBool, $bool);
+    }
+}
diff --git a/rules-tests/CodeQuality/Rector/MethodCall/FlipAssertRector/Fixture/not_same.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/FlipAssertRector/Fixture/not_same.php.inc
new file mode 100644
index 00000000..82e419bc
--- /dev/null
+++ b/rules-tests/CodeQuality/Rector/MethodCall/FlipAssertRector/Fixture/not_same.php.inc
@@ -0,0 +1,29 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\FlipAssertRector\Fixture;
+
+final class NotSame extends \PHPUnit\Framework\TestCase
+{
+    public function test()
+    {
+        $result = '...';
+        $this->assertNotSame($result, 'expected');
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\FlipAssertRector\Fixture;
+
+final class NotSame extends \PHPUnit\Framework\TestCase
+{
+    public function test()
+    {
+        $result = '...';
+        $this->assertNotSame('expected', $result);
+    }
+}
+
+?>
diff --git a/rules/CodeQuality/Rector/MethodCall/FlipAssertRector.php b/rules/CodeQuality/Rector/MethodCall/FlipAssertRector.php
index bd1c2a1c..64a2e303 100644
--- a/rules/CodeQuality/Rector/MethodCall/FlipAssertRector.php
+++ b/rules/CodeQuality/Rector/MethodCall/FlipAssertRector.php
@@ -20,6 +20,13 @@
  */
 final class FlipAssertRector extends AbstractRector
 {
+    /**
+     * @var string[]
+     */
+    private const METHOD_NAMES = [
+        'assertSame', 'assertNotSame', 'assertNotEquals', 'assertEquals', 'assertStringContainsString',
+    ];
+
     public function __construct(
         private readonly TestsNodeAnalyzer $testsNodeAnalyzer
     ) {
@@ -78,10 +85,7 @@ public function getNodeTypes(): array
      */
     public function refactor(Node $node): ?Node
     {
-        if (! $this->testsNodeAnalyzer->isPHPUnitMethodCallNames(
-            $node,
-            ['assertSame', 'assertEquals', 'assertStringContainsString']
-        )) {
+        if (! $this->testsNodeAnalyzer->isPHPUnitMethodCallNames($node, self::METHOD_NAMES)) {
             return null;
         }