Наследование: implements PhpSpec\Wrapper\Subject\Expectation\Expectation
 function it_keeps_looking_for_nested_expectations(AbstractDecorator $decorator, ExpectationInterface $expectation)
 {
     $decorator->getExpectation()->willReturn($expectation);
     $this->beAnInstanceOf('spec\\PhpSpec\\Wrapper\\Subject\\Expectation\\Decorator');
     $this->beConstructedWith($decorator);
     $this->getNestedExpectation()->shouldReturn($expectation);
 }