Add support for createMockForIntersectionOfInterfaces

extension.neon

@@ -47,6 +47,10 @@ services:
 		class: PHPStan\Type\PHPUnit\MockBuilderDynamicReturnTypeExtension
 		tags:
 			- phpstan.broker.dynamicMethodReturnTypeExtension
+	-
+		class: PHPStan\Type\PHPUnit\MockForIntersectionDynamicReturnTypeExtension
+		tags:
+			- phpstan.broker.dynamicMethodReturnTypeExtension
 	-
 		class: PHPStan\Rules\PHPUnit\CoversHelper
 	-

src/Type/PHPUnit/MockForIntersectionDynamicReturnTypeExtension.php

@@ -0,0 +1,79 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Type\PHPUnit;
+
+use PhpParser\Node\Expr\MethodCall;
+use PHPStan\Analyser\Scope;
+use PHPStan\Reflection\MethodReflection;
+use PHPStan\Type\DynamicMethodReturnTypeExtension;
+use PHPStan\Type\ObjectType;
+use PHPStan\Type\Type;
+use PHPStan\Type\TypeCombinator;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\MockObject\Stub;
+use PHPUnit\Framework\TestCase;
+use function count;
+use function in_array;
+
+class MockForIntersectionDynamicReturnTypeExtension implements DynamicMethodReturnTypeExtension
+{
+
+	public function getClass(): string
+	{
+		return TestCase::class;
+	}
+
+	public function isMethodSupported(MethodReflection $methodReflection): bool
+	{
+		return in_array(
+			$methodReflection->getName(),
+			[
+				'createMockForIntersectionOfInterfaces',
+				'createStubForIntersectionOfInterfaces',
+			],
+			true,
+		);
+	}
+
+	public function getTypeFromMethodCall(MethodReflection $methodReflection, MethodCall $methodCall, Scope $scope): ?Type
+	{
+		$args = $methodCall->getArgs();
+		if (!isset($args[0])) {
+			return null;
+		}
+
+		$interfaces = $scope->getType($args[0]->value);
+		$constantArrays = $interfaces->getConstantArrays();
+		if (count($constantArrays) !== 1) {
+			return null;
+		}
+
+		$constantArray = $constantArrays[0];
+		if (count($constantArray->getOptionalKeys()) > 0) {
+			return null;
+		}
+
+		$result = [];
+		if ($methodReflection->getName() === 'createMockForIntersectionOfInterfaces') {
+			$result[] = new ObjectType(MockObject::class);
+		} else {
+			$result[] = new ObjectType(Stub::class);
+		}
+
+		foreach ($constantArray->getValueTypes() as $valueType) {
+			if (!$valueType->isClassString()->yes()) {
+				return null;
+			}
+
+			$values = $valueType->getConstantScalarValues();
+			if (count($values) !== 1) {
+				return null;
+			}
+
+			$result[] = new ObjectType((string) $values[0]);
+		}
+
+		return TypeCombinator::intersect(...$result);
+	}
+
+}

tests/Rules/PHPUnit/MockMethodCallRuleTest.php

@@ -4,6 +4,8 @@
 
 use PHPStan\Rules\Rule;
 use PHPStan\Testing\RuleTestCase;
+use PHPUnit\Framework\TestCase;
+use function method_exists;
 use const PHP_VERSION_ID;
 
 /**
@@ -34,6 +36,17 @@ public function testRule(): void
 			],
 		];
 
+		if (method_exists(TestCase::class, 'createMockForIntersectionOfInterfaces')) { // @phpstan-ignore-line
+			$expectedErrors[] = [
+				'Trying to mock an undefined method bazMethod() on class MockMethodCall\FooInterface&MockMethodCall\BarInterface.',
+				49,
+			];
+			$expectedErrors[] = [
+				'Trying to mock an undefined method bazMethod() on class MockMethodCall\FooInterface&MockMethodCall\BarInterface.',
+				57,
+			];
+		}
+
 		$this->analyse([__DIR__ . '/data/mock-method-call.php'], $expectedErrors);
 	}
 

tests/Rules/PHPUnit/data/mock-method-call.php

@@ -41,6 +41,22 @@ public function testMockObject(\PHPUnit\Framework\MockObject\MockObject $mock)
 		$mock->method('doFoo');
 	}
 
+	public function testMockForIntersection()
+	{
+		$mock = $this->createMockForIntersectionOfInterfaces([FooInterface::class, BarInterface::class]);
+		$mock->method('fooMethod');
+		$mock->method('barMethod');
+		$mock->method('bazMethod');
+	}
+
+	public function testStubForIntersection()
+	{
+		$stub = $this->createStubForIntersectionOfInterfaces([FooInterface::class, BarInterface::class]);
+		$stub->method('fooMethod');
+		$stub->method('barMethod');
+		$stub->method('bazMethod');
+	}
+
 }
 
 class Bar {
@@ -71,3 +87,11 @@ public function testMockFinalClass()
 	}
 
 }
+
+interface FooInterface {
+	public function fooMethod(): int;
+}
+
+interface BarInterface {
+	public function barMethod(): string;
+}