From dddef182b882992fd1aa85b3c74789f5b7436f8e Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Fri, 30 Jan 2026 23:19:06 +0100
Subject: [PATCH 1/2]  [phpunit 12] Add /ExpressionCreateMockToCreateStubRector

---
 config/sets/phpunit120.php                    |   2 +
 .../Source/InstanceWithMock.php               |  15 ++
 ...essionCreateMockToCreateStubRectorTest.php |  28 +++
 .../Fixture/fixture.php.inc                   |  39 ++++
 .../Fixture/skip_mocking.php.inc              |  18 ++
 .../Fixture/skip_used_outside_arg.php.inc     |  21 ++
 .../Source/ClassWithDependency.php            |  16 ++
 .../config/configured_rule.php                |   9 +
 ...ExpressionCreateMockToCreateStubRector.php | 187 ++++++++++++++++++
 9 files changed, 335 insertions(+)
 create mode 100644 rules-tests/PHPUnit120/Rector/CallLike/CreateStubOverCreateMockArgRector/Source/InstanceWithMock.php
 create mode 100644 rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/ExpressionCreateMockToCreateStubRectorTest.php
 create mode 100644 rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/fixture.php.inc
 create mode 100644 rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_mocking.php.inc
 create mode 100644 rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_used_outside_arg.php.inc
 create mode 100644 rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Source/ClassWithDependency.php
 create mode 100644 rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/config/configured_rule.php
 create mode 100644 rules/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector.php

diff --git a/config/sets/phpunit120.php b/config/sets/phpunit120.php
index 5990bd7b..5f3cec26 100644
--- a/config/sets/phpunit120.php
+++ b/config/sets/phpunit120.php
@@ -6,6 +6,7 @@
 use Rector\PHPUnit\PHPUnit120\Rector\CallLike\CreateStubOverCreateMockArgRector;
 use Rector\PHPUnit\PHPUnit120\Rector\Class_\AssertIsTypeMethodCallRector;
 use Rector\PHPUnit\PHPUnit120\Rector\Class_\RemoveOverrideFinalConstructTestCaseRector;
+use Rector\PHPUnit\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector;
 
 return static function (RectorConfig $rectorConfig): void {
     $rectorConfig->rules([
@@ -14,6 +15,7 @@
 
         // stubs over mocks
         CreateStubOverCreateMockArgRector::class,
+        ExpressionCreateMockToCreateStubRector::class,
 
         // experimental, from PHPUnit 12.5.2
         // @see https://github.com/sebastianbergmann/phpunit/commit/24c208d6a340c3071f28a9b5cce02b9377adfd43
diff --git a/rules-tests/PHPUnit120/Rector/CallLike/CreateStubOverCreateMockArgRector/Source/InstanceWithMock.php b/rules-tests/PHPUnit120/Rector/CallLike/CreateStubOverCreateMockArgRector/Source/InstanceWithMock.php
new file mode 100644
index 00000000..a3e96ca6
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/CallLike/CreateStubOverCreateMockArgRector/Source/InstanceWithMock.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\CallLike\CreateStubOverCreateMockArgRector\Source;
+
+final class InstanceWithMock
+{
+    public function __construct(private $object)
+    {
+    }
+
+    public function getInner(): object
+    {
+        return $this->object;
+    }
+}
diff --git a/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/ExpressionCreateMockToCreateStubRectorTest.php b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/ExpressionCreateMockToCreateStubRectorTest.php
new file mode 100644
index 00000000..5742a88f
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/ExpressionCreateMockToCreateStubRectorTest.php
@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class ExpressionCreateMockToCreateStubRectorTest extends AbstractRectorTestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): Iterator
+    {
+        return self::yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/configured_rule.php';
+    }
+}
diff --git a/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/fixture.php.inc b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/fixture.php.inc
new file mode 100644
index 00000000..3f4db74f
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/fixture.php.inc
@@ -0,0 +1,39 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Source\ClassWithDependency;
+
+final class SomeTest extends TestCase
+{
+    public function test()
+    {
+        $mock = $this->createMock(\stdClass::class);
+
+        $someObject = new ClassWithDependency($mock);
+        $this->assertSame($mock, $someObject->getDependency());
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Source\ClassWithDependency;
+
+final class SomeTest extends TestCase
+{
+    public function test()
+    {
+        $mock = $this->createStub(\stdClass::class);
+
+        $someObject = new ClassWithDependency($mock);
+        $this->assertSame($mock, $someObject->getDependency());
+    }
+}
+
+?>
diff --git a/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_mocking.php.inc b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_mocking.php.inc
new file mode 100644
index 00000000..0e2bc46a
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_mocking.php.inc
@@ -0,0 +1,18 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Source\ClassWithDependency;
+
+final class SkipMocking extends TestCase
+{
+    public function test()
+    {
+        $mock = $this->createMock(\stdClass::class);
+        $mock->expects($this->once())->method('someMethod')->willReturn('someValue');
+
+        $someObject = new ClassWithDependency($mock);
+        $this->assertSame($mock, $someObject->getDependency());
+    }
+}
diff --git a/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_used_outside_arg.php.inc b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_used_outside_arg.php.inc
new file mode 100644
index 00000000..90840606
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_used_outside_arg.php.inc
@@ -0,0 +1,21 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Source\ClassWithDependency;
+
+final class SkipUsedOutsideArg extends TestCase
+{
+    public function test()
+    {
+        $mock = $this->createMock(\stdClass::class);
+
+        if ($mock instanceof \stdClass) {
+            // do something
+        }
+
+        $someObject = new ClassWithDependency($mock);
+        $this->assertSame($mock, $someObject->getDependency());
+    }
+}
diff --git a/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Source/ClassWithDependency.php b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Source/ClassWithDependency.php
new file mode 100644
index 00000000..e09079bc
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Source/ClassWithDependency.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Source;
+
+final class ClassWithDependency
+{
+    public function __construct(
+        private $dependency,
+    ) {
+    }
+
+    public function getDependency()
+    {
+        return $this->dependency;
+    }
+}
diff --git a/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/config/configured_rule.php b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/config/configured_rule.php
new file mode 100644
index 00000000..533d9330
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/config/configured_rule.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\PHPUnit\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector;
+
+return RectorConfig::configure()
+    ->withRules(rules: [ExpressionCreateMockToCreateStubRector::class]);
diff --git a/rules/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector.php b/rules/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector.php
new file mode 100644
index 00000000..c1c481e1
--- /dev/null
+++ b/rules/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector.php
@@ -0,0 +1,187 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\PHPUnit120\Rector\ClassMethod;
+
+use PhpParser\Node;
+use PhpParser\Node\Arg;
+use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\CallLike;
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\New_;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Expr\Variable;
+use PhpParser\Node\Identifier;
+use PhpParser\Node\Stmt\ClassMethod;
+use PhpParser\Node\Stmt\Expression;
+use Rector\PhpParser\Node\BetterNodeFinder;
+use Rector\PHPUnit\CodeQuality\NodeAnalyser\AssignedMocksCollector;
+use Rector\PHPUnit\CodeQuality\NodeFinder\VariableFinder;
+use Rector\PHPUnit\NodeAnalyzer\TestsNodeAnalyzer;
+use Rector\Rector\AbstractRector;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+/**
+ * @see \Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\ExpressionCreateMockToCreateStubRectorTest
+ */
+final class ExpressionCreateMockToCreateStubRector extends AbstractRector
+{
+    public function __construct(
+        private readonly AssignedMocksCollector $assignedMocksCollector,
+        private readonly TestsNodeAnalyzer $testsNodeAnalyzer,
+        private readonly VariableFinder $variableFinder,
+        private readonly BetterNodeFinder $betterNodeFinder,
+    ) {
+    }
+
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition(
+            'Replace createMock() assigned to variable that is only used as arg with no expectations, to createStub()',
+            [
+                new CodeSample(
+                    <<<'CODE_SAMPLE'
+use PHPUnit\Framework\TestCase;
+
+final class SomeTest extends TestCase
+{
+    public function test(): void
+    {
+        $mock = $this->createMock(SomeClass::class);
+
+        $someObject = new SomeClass($mock);
+        $this->assertSame($mock, $someObject->getDependency());
+    }
+}
+CODE_SAMPLE
+                    ,
+                    <<<'CODE_SAMPLE'
+use PHPUnit\Framework\TestCase;
+
+final class SomeTest extends TestCase
+{
+    public function test(): void
+    {
+        $mock = $this->createStub(SomeClass::class);
+
+        $someObject = new SomeClass($mock);
+        $this->assertSame($mock, $someObject->getDependency());
+    }
+}
+CODE_SAMPLE
+                ),
+
+            ]
+        );
+    }
+
+    public function getNodeTypes(): array
+    {
+        return [ClassMethod::class];
+    }
+
+    /**
+     * @param ClassMethod $node
+     */
+    public function refactor(Node $node): ?ClassMethod
+    {
+        if (! $this->testsNodeAnalyzer->isTestClassMethod($node)) {
+            return null;
+        }
+
+        if ($node->stmts === null || count($node->stmts) < 2) {
+            return null;
+        }
+
+        $hasChanged = false;
+
+        foreach ($node->stmts as $stmt) {
+            if (! $stmt instanceof Expression) {
+                continue;
+            }
+
+            if (! $stmt->expr instanceof Assign) {
+                continue;
+            }
+
+            $typeArg = $this->assignedMocksCollector->matchCreateMockArgAssignedToVariable($stmt->expr);
+            if (! $typeArg instanceof Arg) {
+                continue;
+            }
+
+            /** @var Assign $assign */
+            $assign = $stmt->expr;
+
+            if (! $assign->var instanceof Variable) {
+                continue;
+            }
+
+            $assignedVariable = $assign->var;
+            $variableName = $this->getName($assignedVariable);
+            if ($variableName === null) {
+                continue;
+            }
+
+            // find variable usages outside call like and inside it
+            $usedVariables = $this->variableFinder->find($node, $variableName);
+
+            // used variable in calls
+            /** @var array<StaticCall|MethodCall|New_> $callLikes */
+            $callLikes = $this->betterNodeFinder->findInstancesOfScoped($node->stmts, [CallLike::class]);
+
+            $callLikeUsedVariables = $this->collectVariableInCallLikeArg($callLikes, $variableName);
+
+            if (count($usedVariables) - 1 !== count($callLikeUsedVariables)) {
+                continue;
+            }
+
+            // here we can flip the createMock() to createStub()
+
+            if (! $assign->expr instanceof MethodCall) {
+                continue;
+            }
+
+            $methodCall = $assign->expr;
+            $methodCall->name = new Identifier('createStub');
+
+            $hasChanged = true;
+        }
+
+        if ($hasChanged) {
+            return $node;
+        }
+
+        return null;
+    }
+
+    /**
+     * @param CallLike[] $callLikes
+     * @return Variable[]
+     */
+    private function collectVariableInCallLikeArg(array $callLikes, string $variableName): array
+    {
+        $callLikeUsedVariables = [];
+
+        foreach ($callLikes as $callLike) {
+            if ($callLike->isFirstClassCallable()) {
+                continue;
+            }
+
+            foreach ($callLike->getArgs() as $arg) {
+                if (! $arg->value instanceof Variable) {
+                    continue;
+                }
+
+                if (! $this->isName($arg->value, $variableName)) {
+                    continue;
+                }
+
+                $callLikeUsedVariables[] = $arg->value;
+            }
+        }
+
+        return $callLikeUsedVariables;
+    }
+}

From 7f028e8d62affe208d81ae2a0cbd8b161ffd3f8f Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Sat, 31 Jan 2026 09:34:14 +0100
Subject: [PATCH 2/2] fixup!  [phpunit 12] Add
 /ExpressionCreateMockToCreateStubRector

---
 .../skip_property_for_external_scope.php.inc  | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_property_for_external_scope.php.inc

diff --git a/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_property_for_external_scope.php.inc b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_property_for_external_scope.php.inc
new file mode 100644
index 00000000..babc90b2
--- /dev/null
+++ b/rules-tests/PHPUnit120/Rector/ClassMethod/ExpressionCreateMockToCreateStubRector/Fixture/skip_property_for_external_scope.php.inc
@@ -0,0 +1,19 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\PHPUnit120\Rector\ClassMethod\ExpressionCreateMockToCreateStubRector\Source\ClassWithDependency;
+
+final class SkipPropertyForExternalScope extends TestCase
+{
+    private \PHPUnit\Framework\MockObject\MockObject $mock;
+
+    public function test()
+    {
+        $this->mock = $this->createMock(\stdClass::class);
+
+        $someObject = new ClassWithDependency($this->mock);
+        $this->assertSame($this->mock, $someObject->getDependency());
+    }
+}