Unlocking the Secret of Jasmine Spy Names in a Custom Matcher

One idea I have is to develop a custom matcher using Jasmine 2.0 to validate spies based on additional criteria. To put it in simple terms, something along the lines of:

var customMatchers = {
  toDoSomething: function(util, customEqualityTesters) {
    return {
      compare: function(spy) {
        var comparison = {};
        comparison.pass = testSomeCondition(spy);
        if (!comparison.pass) {
          comparison.message = "Anticipate " + /insert code here/ + " to perform an action";
        }
        return comparison;
      }
    }
  }
};

beforeEach(function() {
    jasmine.addMatchers(customMatchers);
});

My query revolves around retrieving the spy name, which is provided as the first argument in the factory method: createSpy(name, originalFn).

I've scoured through both the Jasmine v2.6 documentation and various online guides but haven't found any information on this topic.

console.log(spy) shows function(...) {...}

Answer №1

While exploring the Jasmine source code, I stumbled upon the original implementation of toHaveBeenCalled:

spy.and.identity()

This method also works flawlessly when used in a custom matcher.

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