Clever Geek Handbook

How can I expect Mocha test to fail?

I am testing a piece of code where I want to specifically check that some event is never fired.

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

Instead of "expect (true) .to.eq (false)"; or "done (new error (" should never have been reached ")); is there a way to say

     fail("should have never been reached"):

The latter would be much more expressive. Is there any expression / solution like this could not be found.

+3


source to share


1 answer


I would use a spy - 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);
+3


source






More articles:


All Articles