Testing asynchronously using Jasmine

My Jasmine and RequireJS test setup was going smoothly until I encountered an issue with the context of the functions I was working on.

I am conducting Ajax tests, so my first step is to set up a listener for success and then make the service request. Within each of my it() declarations, I perform tests based on the response from the service.

You can find my spec modules here:

// auth.js
define(['service/auth'], function(auth) {
  describe('Tests "auth" service', function() {
    var data;
    var OPTIONS = {
      CN: '147144147',
      GV: '147153162'
    };

    auth.on.success.addOnce(function(response) {
      data = response;
    });

    auth.request(OPTIONS);

    it('"status" should exist and be "true"', function() {
      waitsFor(function() {
        return data !== undefined;
      });

      runs(function() {
        expect(data['status']).toBeDefined();
        expect(data['status']).toBeTruthy();
      });
    });

  });
});

// login.js
define(['service/login'], function(login) {
  describe('Tests "login" service', function() {
    var data;
    var OPTIONS = {
      oper: 1,
      codigoouemail: '101',
      senha: '10151015'
    };

    login.on.success.addOnce(function( response ) {
      data = response;
    });

    login.request(OPTIONS);

    it('Should get the service response for user "' + OPTIONS.codigoouemail + '"', function() {
      waitsFor(function() {
        return data !== undefined;
      });

      runs(function() {
        expect(data).toBeDefined();
      });
    });

  });
});

Both modules work well individually, but I noticed that they share the same value for data. The first module to run sets its value, and subsequent specs will have the same value. I need each module to have its own unique value so I can properly test each service response. In theory, each module should have its own scope, but it seems like this isn't happening in practice.

Does anyone have any suggestions on how to resolve this issue?

Answer №1

Here is a demonstration of an asynchronous test I utilize to verify the creation of my VOs:

it('should validate the creation of item VOs', function() {
  var dfd = $q.defer();
  var items = mock.content.items[1].items;

  runs(function() {
    dfd.promise.then(function(VOs) {
      expect(VOs.length).toBe(items.length);
      expect(A.equals(itemVO(items[0]), VOs[0])).toBe(true);
    }, this.fail);
  });

  waits(50);

  runs(function() {
    itemsVO(dfd, items);

    $rootScope.$digest();
  });
});

Initially, a function is executed to monitor the completion of the asynchronous task, followed by a 50ms wait period to ensure app readiness before executing the async function. Pay attention to how the expect statement is within the callback function.

Answer №2

My mistake entirely. Turns out there was a glitch in the ajax call causing it to return the same value every time, leading to test failures. Appreciate the assistance nonetheless :)

Answer №3

Unfortunately, the issue does not lie within the data variable itself. In Javascript, variables have function scope, which means that two identical variables declared in different functions are actually distinct entities. To illustrate this point, I have created a demonstration on JSFiddle where you can see that the data variables are indeed separate instances: http://jsfiddle.net/ABC123/4/

Check out the following code snippet:

//--- TEST CASES -------------------------
describe('Timeout service test case 1', function() {

        var data;

        setTimeout(function( response ) {
            data = 3;
        }, 1000);


        it('Should equal 3', function() {

            waitsFor(function() {
                return data !== undefined;
            });

            runs(function() {
                expect(data).toBe(3);
            });

        });


        it('Should equal 30', function() {

            waitsFor(function() {
                return data === 30;
            });

            runs(function() {
                expect(data).toBe(30);
            });

        });

    });

describe('Timeout service test case 2', function() {

        var data;

        setTimeout(function( response ) {
            data = 30;
        }, 2000);


        it('Should equal 30', function() {

            waitsFor(function() {
                return data !== undefined;
            });

            runs(function() {
                expect(data).toBe(30);
            });

        });


        it('Should equal 30', function() {

            waitsFor(function() {
                return data === 3;
            });

            runs(function() {
                expect(data).toBe(3);
            });

        });

    });

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