[code-quality] Add NarrowUnusedSetUpDefinedPropertyRector

rules-tests/CodeQuality/Rector/Class_/NarrowUnusedSetUpDefinedPropertyRector/Fixture/defined_only_in_setup.php.inc

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+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector\Fixture;
+
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector\Source\SomeType;
+
+final class DefinedOnlyInSetup extends TestCase
+{
+    private MockObject $someMock;
+
+    private MockObject $anotherMock;
+
+    protected function setUp(): void
+    {
+        $this->someMock = $this->createMock(SomeType::class);
+        $this->anotherMock = $this->createMock(SomeType::class);
+    }
+
+    public function test()
+    {
+        $this->anotherMock->expects($this->once());
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector\Fixture;
+
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector\Source\SomeType;
+
+final class DefinedOnlyInSetup extends TestCase
+{
+    private MockObject $someMock;
+
+    private MockObject $anotherMock;
+
+    protected function setUp(): void
+    {
+        $this->someMock = $this->createMock(SomeType::class);
+        $this->anotherMock = $this->createMock(SomeType::class);
+    }
+
+    public function test()
+    {
+        $this->anotherMock->expects($this->once());
+    }
+}
+
+?>

rules-tests/CodeQuality/Rector/Class_/NarrowUnusedSetUpDefinedPropertyRector/Fixture/skip_non_mocks.php.inc

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+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+use Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector\Source\SomeType;
+
+final class SkipNonMocks extends TestCase
+{
+    private SomeType $someMock;
+    private SomeType $anotherMock;
+
+    protected function setUp(): void
+    {
+        $this->someMock = new SomeType();
+        $this->anotherMock = new SomeType();
+    }
+
+    public function test()
+    {
+        $this->anotherMock->expects($this->once());
+    }
+}

rules-tests/CodeQuality/Rector/Class_/NarrowUnusedSetUpDefinedPropertyRector/NarrowUnusedSetUpDefinedPropertyRectorTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class NarrowUnusedSetUpDefinedPropertyRectorTest 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';
+    }
+}

rules-tests/CodeQuality/Rector/Class_/NarrowUnusedSetUpDefinedPropertyRector/Source/SomeType.php

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+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector\Source;
+
+final class SomeType
+{
+
+}

rules-tests/CodeQuality/Rector/Class_/NarrowUnusedSetUpDefinedPropertyRector/config/configured_rule.php

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+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\PHPUnit\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->rule(NarrowUnusedSetUpDefinedPropertyRector::class);
+};

rules/CodeQuality/Rector/Class_/NarrowUnusedSetUpDefinedPropertyRector.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Rector\PHPUnit\CodeQuality\Rector\Class_;
+
+use PhpParser\Node\Expr\Variable;
+use PhpParser\Node;
+use PhpParser\Node\Expr\PropertyFetch;
+use PhpParser\Node\Name;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\ClassMethod;
+use PhpParser\Node\Stmt\Property;
+use PhpParser\NodeFinder;
+use Rector\PHPUnit\NodeAnalyzer\TestsNodeAnalyzer;
+use Rector\Rector\AbstractRector;
+use Rector\ValueObject\MethodName;
+use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
+use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
+
+/**
+ * @see \Rector\PHPUnit\Tests\CodeQuality\Rector\Class_\NarrowUnusedSetUpDefinedPropertyRector\NarrowUnusedSetUpDefinedPropertyRectorTest
+ */
+final class NarrowUnusedSetUpDefinedPropertyRector extends AbstractRector
+{
+    /**
+     * @var string
+     */
+    private const MOCK_OBJECT_CLASS = 'PHPUnit\Framework\MockObject\MockObject';
+
+    private readonly NodeFinder $nodeFinder;
+
+    public function __construct(
+        private readonly TestsNodeAnalyzer $testsNodeAnalyzer,
+    ) {
+        $this->nodeFinder = new NodeFinder();
+    }
+
+    public function getRuleDefinition(): RuleDefinition
+    {
+        return new RuleDefinition('Turn property used only in setUp() to variable', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+use PHPUnit\Framework\TestCase;
+
+class SomeServiceTest extends TestCase
+{
+    private $someServiceMock;
+
+    public function setUp(): void
+    {
+        $this->someServiceMock = $this->createMock(SomeService::class);
+    }
+}
+CODE_SAMPLE
+                ,
+                <<<'CODE_SAMPLE'
+use PHPUnit\Framework\TestCase;
+
+class SomeServiceTest extends TestCase
+{
+    public function setUp(): void
+    {
+        $someServiceMock = $this->createMock(SomeService::class);
+    }
+}
+CODE_SAMPLE
+                ,
+            ),
+        ]);
+    }
+
+    /**
+     * @return array<class-string<Node>>
+     */
+    public function getNodeTypes(): array
+    {
+        return [Class_::class];
+    }
+
+    /**
+     * @param Class_ $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        if (! $this->testsNodeAnalyzer->isInTestClass($node)) {
+            return null;
+        }
+
+        $setUpClassMethod = $node->getMethod(MethodName::SET_UP);
+        if (! $setUpClassMethod instanceof ClassMethod) {
+            return null;
+        }
+
+        $hasChanged = false;
+
+        foreach ($node->stmts as $key => $classStmt) {
+            if (! $classStmt instanceof Property) {
+                continue;
+            }
+
+            $property = $classStmt;
+            if (! $property->type instanceof Name) {
+                continue;
+            }
+
+            if (! $this->isName($property->type, self::MOCK_OBJECT_CLASS)) {
+                continue;
+            }
+
+            if (! $this->isPropertyUsedOutsideSetUpClassMethod($node, $setUpClassMethod, $property)) {
+                continue;
+            }
+
+            unset($node->stmts[$key]);
+
+            $propertyName = $property->props[0]->name->toString();
+
+            // change property to variable in setUp() method
+            $hasChanged = true;
+            $this->traverseNodesWithCallable($setUpClassMethod, function (Node $node) use (
+                $propertyName
+            ): ?Variable {
+                if (! $node instanceof PropertyFetch) {
+                    return null;
+                }
+
+                if (! $this->isName($node->var, 'this')) {
+                    return null;
+                }
+
+                if (! $this->isName($node->name, $propertyName)) {
+                    return null;
+                }
+
+                return new Variable($propertyName);
+            });
+        }
+
+        if ($hasChanged) {
+            return $node;
+        }
+
+        return null;
+    }
+
+    private function isPropertyUsedOutsideSetUpClassMethod(
+        Class_ $class,
+        ClassMethod $setUpClassMethod,
+        Property $property
+    ): bool {
+        $isPropertyUsed = false;
+
+        foreach ($class->getMethods() as $classMethod) {
+            // skip setUp() method
+            if ($classMethod === $setUpClassMethod) {
+                continue;
+            }
+
+            // check if property is used anywhere else than setup
+            $usedPropertyFetch = $this->nodeFinder->findFirst($classMethod, function (Node $node) use (
+                $property
+            ): bool {
+                if (! $node instanceof PropertyFetch) {
+                    return false;
+                }
+
+                if (! $this->isName($node->var, 'this')) {
+                    return false;
+                }
+
+                $propertyName = $property->props[0]->name->toString();
+                return $this->isName($node->name, $propertyName);
+            });
+
+            if ($usedPropertyFetch instanceof PropertyFetch) {
+                $isPropertyUsed = true;
+            }
+        }
+
+        return $isPropertyUsed;
+    }
+}