javascript-我如何期望Mocha测试失败？

我正在测试一段代码,在该代码中我要专门测试某个事件从未触发.

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

而不是’expect(true).to.eq(false);’或’done(new Error(“应该从未达到”));’有没有办法说

     fail("should have never been reached"):

后者将更具表现力.是否有这样的声明/解决方案,找不到任何声明/解决方案.

解决方法:

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);

标签：mocha,javascript
来源： https://codeday.me/bug/20191120/2041062.html