[fix] skip AddInstanceofAssertForNullableArgumentRector on assert call

rules-tests/CodeQuality/Rector/ClassMethod/AddInstanceofAssertForNullableArgumentRector/Fixture/skip_assert_pass.php.inc

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\ClassMethod\AddInstanceofAssertForNullableArgumentRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\CodeQuality\Rector\ClassMethod\AddInstanceofAssertForNullableArgumentRector\Source\SomeClassUsedInTests;
+
+final class SkipAssertPass extends TestCase
+{
+    public function test(): void
+    {
+        $someObject = $this->getSomeObject();
+        $this->assertInstanceOf(\stdClass::class, $someObject);
+    }
+
+    private function getSomeObject(): ?SomeClassUsedInTests
+    {
+        if (mt_rand(0, 1)) {
+            return new SomeClassUsedInTests();
+        }
+
+        return null;
+    }
+}

rules/CodeQuality/Rector/ClassMethod/AddInstanceofAssertForNullableArgumentRector.php

@@ -18,6 +18,7 @@
 use Rector\PHPUnit\CodeQuality\TypeAnalyzer\SimpleTypeAnalyzer;
 use Rector\PHPUnit\CodeQuality\ValueObject\VariableNameToType;
 use Rector\PHPUnit\CodeQuality\ValueObject\VariableNameToTypeCollection;
+use Rector\PHPUnit\NodeAnalyzer\AssertCallAnalyzer;
 use Rector\PHPUnit\NodeAnalyzer\TestsNodeAnalyzer;
 use Rector\Rector\AbstractRector;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
@@ -33,6 +34,7 @@ public function __construct(
         private readonly NullableObjectAssignCollector $nullableObjectAssignCollector,
         private readonly AssertMethodCallFactory $assertMethodCallFactory,
         private readonly MethodCallParameterTypeResolver $methodCallParameterTypeResolver,
+        private readonly AssertCallAnalyzer $assertCallAnalyzer,
     ) {
     }
 
@@ -180,6 +182,11 @@ private function matchedNullableArgumentNameToType(
                 return null;
             }
 
+            // avoid double null on assert
+            if ($this->assertCallAnalyzer->isAssertMethodCall($node)) {
+                return null;
+            }
+
             $classMethodParameterTypes = $this->methodCallParameterTypeResolver->resolve($node);
 
             foreach ($node->getArgs() as $position => $arg) {

src/NodeAnalyzer/AssertCallAnalyzer.php

@@ -89,6 +89,26 @@ public function containsAssertCall(ClassMethod $classMethod): bool
         return $hasNestedAssertOrMockCall;
     }
 
+    public function isAssertMethodCall(MethodCall|StaticCall $call): bool
+    {
+        if (! $call->name instanceof Identifier) {
+            return false;
+        }
+
+        $callName = $this->nodeNameResolver->getName($call->name);
+        if (! is_string($callName)) {
+            return false;
+        }
+
+        foreach (self::ASSERT_METHOD_NAME_PREFIXES as $assertMethodNamePrefix) {
+            if (str_starts_with($callName, $assertMethodNamePrefix)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     private function hasDirectAssertOrMockCall(ClassMethod $classMethod): bool
     {
         return (bool) $this->betterNodeFinder->findFirst((array) $classMethod->stmts, function (Node $node): bool {
@@ -108,11 +128,11 @@ private function hasDirectAssertOrMockCall(ClassMethod $classMethod): bool
                     return true;
                 }
 
-                return $this->isAssertMethodName($node);
+                return $this->isAssertMethodCall($node);
             }
 
             if ($node instanceof StaticCall) {
-                return $this->isAssertMethodName($node);
+                return $this->isAssertMethodCall($node);
             }
 
             return false;
@@ -171,24 +191,4 @@ private function resolveClassMethodFromCall(StaticCall | MethodCall $call): ?Cla
 
         return $this->astResolver->resolveClassMethod($objectType->getClassName(), $methodName);
     }
-
-    private function isAssertMethodName(MethodCall|StaticCall $call): bool
-    {
-        if (! $call->name instanceof Identifier) {
-            return false;
-        }
-
-        $callName = $this->nodeNameResolver->getName($call->name);
-        if (! is_string($callName)) {
-            return false;
-        }
-
-        foreach (self::ASSERT_METHOD_NAME_PREFIXES as $assertMethodNamePrefix) {
-            if (str_starts_with($callName, $assertMethodNamePrefix)) {
-                return true;
-            }
-        }
-
-        return false;
-    }
 }