WIP add createMock to createStub rector

rules/phpunit/src/Rector/MethodCall/CreateMockToCreateStubRector.php

@@ -0,0 +1,102 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\Rector\MethodCall;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\MethodCall;
+use Rector\Core\PhpParser\Node\Manipulator\AssignManipulator;
+use Rector\Core\PhpParser\Node\Manipulator\MethodCallManipulator;
+use Rector\Core\Rector\AbstractRector;
+use Rector\Core\RectorDefinition\CodeSample;
+use Rector\Core\RectorDefinition\RectorDefinition;
+use Rector\NodeTypeResolver\Node\AttributeKey;
+
+/**
+ * @see https://github.com/sebastianbergmann/phpunit/issues/3120
+ *
+ * @see \Rector\PHPUnit\Tests\Rector\MethodCall\CreateMockToCreateStubRector\CreateMockToCreateStubRectorTest
+ */
+final class CreateMockToCreateStubRector extends AbstractRector
+{
+    /**
+     * @var MethodCallManipulator
+     */
+    private $methodCallManipulator;
+
+    public function __construct(MethodCallManipulator $methodCallManipulator)
+    {
+        $this->methodCallManipulator = $methodCallManipulator;
+    }
+
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition('Replaces createMock() with createStub() when relevant', [
+            new CodeSample(
+                <<<'PHP'
+use PHPUnit\Framework\TestCase
+class MyTest extends TestCase {
+    public function testItBehavesAsExpected(): void
+    {
+        $stub = $this->createMock(\Exception::class);
+        $stub->method('getMessage')
+            ->willReturn('a message');
+        $mock = $this->createMock(\Exception::class);
+        $mock->expects($this->once())
+            ->method('getMessage')
+            ->willReturn('a message');
+        self::assertSame('a message', $stub->getMessage());
+        self::assertSame('a message', $mock->getMessage());
+    }
+}
+PHP
+                 ,
+                <<<'PHP'
+use PHPUnit\Framework\TestCase
+class MyTest extends TestCase {
+    public function testItBehavesAsExpected(): void
+    {
+        $stub = $this->createStub(\Exception::class);
+        $stub->method('getMessage')
+            ->willReturn('a message');
+        $mock = $this->createMock(\Exception::class);
+        $mock->expects($this->once())
+            ->method('getMessage')
+            ->willReturn('a message');
+        self::assertSame('a message', $stub->getMessage());
+        self::assertSame('a message', $mock->getMessage());
+    }
+}
+PHP
+            ),
+        ]);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [MethodCall::class];
+    }
+
+    /**
+     * @param MethodCall $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if (! $this->isName($node->name, 'createMock')) {
+            return null;
+        }
+        $parentNode = $node->getAttribute(AttributeKey::PARENT_NODE);
+        if (!$parentNode instanceof Assign) {
+            return null;
+        }
+
+        dump($this->methodCallManipulator->findMethodCallNamesOnVariable($parentNode->var));
+
+        return $node;
+    }
+}

rules/phpunit/tests/Rector/MethodCall/CreateMockToCreateStubRector/CreateMockToCreateStubRectorTest.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\phpunit\Tests\Rector\MethodCall\CreateMockToCreateStubRector;
+
+use Iterator;
+use Rector\Core\Testing\PHPUnit\AbstractRectorTestCase;
+use Rector\phpunit\Rector\MethodCall\CreateMockToCreateStubRector;
+
+final class CreateMockToCreateStubRectorTest extends AbstractRectorTestCase
+{
+    /**
+     * @dataProvider provideData()
+     */
+    public function test(string $file): void
+    {
+        $this->doTestFile($file);
+    }
+
+    public function provideData(): Iterator
+    {
+        return $this->yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    protected function getRectorClass(): string
+    {
+        return CreateMockToCreateStubRector::class;
+    }
+}

rules/phpunit/tests/Rector/MethodCall/CreateMockToCreateStubRector/Fixture/fixture.php.inc

@@ -0,0 +1,47 @@
+<?php
+
+namespace Rector\phpunit\Tests\Rector\MethodCall\CreateMockToCreateStubRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+class MyTest extends TestCase
+{
+    public function testItBehavesAsExpected(): void
+    {
+        $stub = $this->createMock(\Exception::class);
+        $stub->method('getMessage')
+            ->willReturn('a message');
+        $mock = $this->createMock(\Exception::class);
+        $mock->expects($this->once())
+            ->method('getMessage')
+            ->willReturn('a message');
+        self::assertSame('a message', $stub->getMessage());
+        self::assertSame('a message', $mock->getMessage());
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\phpunit\Tests\Rector\MethodCall\CreateMockToCreateStubRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+class MyTest extends TestCase
+{
+    public function testItBehavesAsExpected(): void
+    {
+        $stub = $this->createStub(\Exception::class);
+        $stub->method('getMessage')
+            ->willReturn('a message');
+        $mock = $this->createMock(\Exception::class);
+        $mock->expects($this->once())
+            ->method('getMessage')
+            ->willReturn('a message');
+        self::assertSame('a message', $stub->getMessage());
+        self::assertSame('a message', $mock->getMessage());
+    }
+}
+
+?>