Can you provide a list of factors that influence coverage? Additionally, is there a specific algorithm available for calculating

As part of my Angular project, I am currently focusing on writing unit test cases using the Jasmine Framework and Karma. To ensure thorough testing coverage, I am utilizing Coverage-html (Istanbul).

When it comes to coverage, there are several important types to consider:

  1. Function coverage.
  2. Branch coverage.
  3. Statement coverage.
  4. Line coverage.
  5. Ignored coverage (handled through Istanbul).

I would appreciate an explanation of these different types of coverage and any essential factors that should be taken into account while writing unit test cases:

function setCookie(sessionId) {
    if(sessionId) {
        setCookie('sessionId', sessionId, 21600);
    } else {
        setCookie('sessionId', session.getId(), 21600);
    }
}

In regard to this function, I have already written some test cases:

describe('setCookie()', function(){
    it('should set a cookie without expiration days', function() {
        var deferred = $q.defer();
        spyOn(sessionCard, 'setCookie').andCallFake(function(){
              return deferred.promise;
        })
        sessionCard.setCookie('sessionId', 'sessionId');
        expect(document.cookie).toBeDefined();
        expect(document.cookie).toBeTruthy();
    });
})  

Answer №1

Ensuring various types of coverage is crucial in unit testing, but it does not guarantee complete code coverage.

Every function presents multiple scenarios that need to be tested thoroughly.

  1. Coverage of all statements at least once
  2. Inclusion of all positive test cases (happy path scenarios)
  3. Testing all fail-safe conditions such as exception handling blocks

By addressing the above scenarios, one can reasonably assume that a function has been fully tested. It's important to ensure tests focus on output rather than specific variable values.

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