Print message on expect() assert failure

Question

Is there a way to print a custom error message when a Jasmine expect() fails?

As an example, for end to end testing I have an array of web pages and I u

Answer 1

I had a requirement to log custom messages for Jasmine and I used the following method.

beforeEach(function(){
    this.addMatchers({
        customError: function(mesg){
                         this.message= function () {
                                           return mesg;
                                       };
                         return this.actual == true;
                         }
                     });
        });
if(<fail condidtion>){
    expect(false).customError(<Fail message>)
}

Please do note, what I have mentioned above is by jasmine 1 format. There will been slight change if you are using jasmine 2. Hope this is helpful for you

Answer 2

Since Jasmine 3.3, there's a way to do it through withContext

Example:

expect(someValue).withContext('expected someValue to be true...').toBe(true)

See also https://github.com/jasmine/jasmine/issues/641#issuecomment-457037665