ZoneTask.toString can return a number, which causes problems in Jasmine

[fr0]

If a karma/jasmine test fails due to an unhandled promise rejection, Jasmine's PrettyPrinter class throws an exception due to the ZoneTask.toString function not returning a string.

See: jasmine/jasmine#1575

[JiaLiPassion]

@fr0, thanks, is there any reproduce repo?

[fr0]

I have not been able to reproduce it outside of my private repo, but I will keep trying. Thanks!

[jonatino]

Also seeing this issue in jasmine.

[jonatino]

@JiaLiPassion @fr0 looks like the issue is coming from here (ZoneTask)

    public toString() {
      if (this.data && typeof this.data.handleId !== 'undefined') {
        return this.data.handleId;
      } else {
        return Object.prototype.toString.call(this);
      }
    }

It will return the TaskData.handleId which is a number. Returning a number doesn't make sense in a toString() call.

[JiaLiPassion]

@jonatino, thanks! I will fix this one.