[CodeQuality] Skip compare string to Stringable object on AssertEqualsToSameRector

rules-tests/CodeQuality/Rector/MethodCall/AssertEqualsToSameRector/Fixture/skip_stringable_object.php.inc

@@ -0,0 +1,14 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\AssertEqualsToSameRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\AssertEqualsToSameRector\Source\SimpleStringable;
+
+final class SkipStringableObject extends TestCase
+{
+    public function test()
+    {
+        $this->assertEquals('value', new SimpleStringable());
+    }
+}

rules-tests/CodeQuality/Rector/MethodCall/AssertEqualsToSameRector/Source/SimpleStringable.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\AssertEqualsToSameRector\Source;
+
+use Stringable;
+
+final class SimpleStringable implements Stringable
+{
+    public function __toString()
+    {
+        return 'value';
+    }
+}

rules/CodeQuality/Rector/MethodCall/AssertEqualsToSameRector.php

@@ -16,6 +16,7 @@
 use PHPStan\Type\FloatType;
 use PHPStan\Type\IntegerType;
 use PHPStan\Type\MixedType;
+use PHPStan\Type\ObjectType;
 use PHPStan\Type\StringType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
@@ -49,7 +50,7 @@ final class AssertEqualsToSameRector extends AbstractRector
 
     public function __construct(
         private readonly IdentifierManipulator $identifierManipulator,
-        private readonly TestsNodeAnalyzer $testsNodeAnalyzer
+        private readonly TestsNodeAnalyzer $testsNodeAnalyzer,
     ) {
     }
 
@@ -113,6 +114,13 @@ public function refactor(Node $node): ?Node
             if ($firstArgType instanceof FloatType && ($secondArgType instanceof IntegerType || $secondArgType instanceof MixedType)) {
                 return null;
             }
+
+            if ($firstArgType instanceof StringType && $secondArgType instanceof ObjectType && $this->isObjectType(
+                $args[1]->value,
+                new ObjectType('Stringable')
+            )) {
+                return null;
+            }
         }
 
         $hasChanged = $this->identifierManipulator->renameNodeWithMap($node, self::RENAME_METHODS_MAP);