我怎么能期望摩卡测试失败？

Question

我正在测试一段代码，我想专门测试某个事件从未被触发。

      eventBus.once("property:change", function(msg) {            
        expect(true).to.eq(false);
        done();
      });

而不是 'expect(true).to.eq(false);' 或 'done(new Error("should have never been reached"));' 有没有办法说

     fail("should have never been reached"):

后者会更有表现力。有没有这样的statement/solution，没找到

Answer 1

我会使用间谍 - http://sinonjs.org/

var callback = sinon.spy();
eventBus.once("property:change", callback);

// Things that could potentially but should not trigger the event

assert.equals(callback.callCount, 0);

我怎么能期望摩卡测试失败？

How can I expect for a failure in a Mocha test?

javascript

mocha.js