React\Promise\LazyPromiseTest::shouldReturnPromiseIfFactoryReturnsNull PHP Метод

    public function shouldReturnPromiseIfFactoryReturnsNull()
    {
        $factory = $this->createCallableMock();
        $factory->expects($this->once())->method('__invoke')->will($this->returnValue(null));
        $p = new LazyPromise($factory);
        $this->assertInstanceOf('React\\Promise\\PromiseInterface', $p->then());
    }