如何期待失败的步骤并传递黄瓜的失败？

We want to test our step definitions for cucumber. One thing we would like to be able to check is that tests which we expect to fail actually do fail. To do this, we would like to write scenarios that we know will fail and add them to our test suite, but tag or otherwise denote them so that they "pass" if and only if they fail. How would one approach this?We want to test our step definitions for cucumb