Swapping AngularJS module parameters for testing

Question

Swapping AngularJS module parameters for testing

Within my module, there exists a greet factory that is attached:

angular.module('someModule', [])
  .factory('greet', function(name) {
    return function() {
      return 'Hi ' + name + '!';
    }
  });

This factory relies on the injection of a name, which is a value specified in a separate module.

angular.module('someOtherModule', [])
  .value('name', 'example');

During the testing phase of this module, I aim to be able to modify the injected name value multiple times (once per test), allowing my tests to resemble the following structure:

// Within my test file…

// Set up the module being tested (`greet`) and simulate the other module containing a `name` value
beforeEach(mocks.module('someModule', function ($provider) {
    $provider.value('name', 'Bob');
}));

var greet

beforeEach(mocks.inject(function ($injector) {
    greet = $injector.get('greet');
});

it('should display "Bob"', function () {
    expect(greet()).toBe('Hi Bob!');
});

// Subsequently, alter the `name` value to now be "Bar"

it('should display "Bar"', function () {
    expect(greet()).toBe('Hi Bar!');
});

Is it achievable?

The integration of these two modules takes place within my app module:

angular.module('app', ['someModule', 'someOtherModule'])

javascript testing angularjs jasmine

Answer 1

Answer №1

If you want to inject a value, you can use the following code: $provide.value('name', 'Bob');

var myApp = angular.module('myApp', []);

myApp.factory('greet', function (name) {
    return function () {
        return 'Hi ' + name + '!';
    }
});

myApp.value('name', 'example');

describe('myApp', function () {
    beforeEach(angular.mock.module('myApp'));

    it('should greet "Bob"', function () {
        module(function ($provide) {
            $provide.value('name', 'Bob');
        });
        angular.mock.inject(function ($injector) {
            var greet = $injector.get('greet');
            expect(greet()).toBe('Hi Bob!');
        })
    });

    it('should greet "Bar"', function () {
        module(function ($provide) {
            $provide.value('name', 'Bar');
        });
        angular.mock.inject(function ($injector) {
            var greet = $injector.get('greet');
            expect(greet()).toBe('Hi Bar!');
        })
    });
});

I have prepared a demonstration for you in hopes that it will provide some clarity!

Updated: demo

View Demo

Answer 2

If you want to inject a value, you can use the following code: $provide.value('name', 'Bob');

var myApp = angular.module('myApp', []);

myApp.factory('greet', function (name) {
    return function () {
        return 'Hi ' + name + '!';
    }
});

myApp.value('name', 'example');

describe('myApp', function () {
    beforeEach(angular.mock.module('myApp'));

    it('should greet "Bob"', function () {
        module(function ($provide) {
            $provide.value('name', 'Bob');
        });
        angular.mock.inject(function ($injector) {
            var greet = $injector.get('greet');
            expect(greet()).toBe('Hi Bob!');
        })
    });

    it('should greet "Bar"', function () {
        module(function ($provide) {
            $provide.value('name', 'Bar');
        });
        angular.mock.inject(function ($injector) {
            var greet = $injector.get('greet');
            expect(greet()).toBe('Hi Bar!');
        })
    });
});

I have prepared a demonstration for you in hopes that it will provide some clarity!

Updated: demo

View Demo

Answer 3

Answer №2

I managed to get this working by making a small adjustment to how the name dependency was injected (noted in the comment below). Here is the code for the app:

angular.module("app", ["some", "other"]);

angular.module("some", []).factory('greet', function(name) { // injection of name happens here
  return function() { // moved the name dependency from here up one function signature
    return 'Hi ' + name + '!';
  };
});

angular.module("other", []).value('name', 'example');

This test is as DRY as possible:

describe("greet", function() {

  var provide = injector = greet = undefined;

  beforeEach(function() {
    module('app', function($provide) {
      provide = $provide;
    });
    inject(function($injector) {
      injector = $injector;
    });
    greet = function() {
      return injector.get('greet')();
    };
  });

  describe("#greet", function() {
    it("should say Hi Bob", function() {
      provide.value('name', 'Bob');
      expect(greet()).toBe('Hi Bob!');
    });

    it("should say Hi Biff", function() {
      provide.value('name', 'Biff');
      expect(greet()).toBe('Hi Biff!');
    });
  });

});

Answer 4

I managed to get this working by making a small adjustment to how the name dependency was injected (noted in the comment below). Here is the code for the app:

angular.module("app", ["some", "other"]);

angular.module("some", []).factory('greet', function(name) { // injection of name happens here
  return function() { // moved the name dependency from here up one function signature
    return 'Hi ' + name + '!';
  };
});

angular.module("other", []).value('name', 'example');

This test is as DRY as possible:

describe("greet", function() {

  var provide = injector = greet = undefined;

  beforeEach(function() {
    module('app', function($provide) {
      provide = $provide;
    });
    inject(function($injector) {
      injector = $injector;
    });
    greet = function() {
      return injector.get('greet')();
    };
  });

  describe("#greet", function() {
    it("should say Hi Bob", function() {
      provide.value('name', 'Bob');
      expect(greet()).toBe('Hi Bob!');
    });

    it("should say Hi Biff", function() {
      provide.value('name', 'Biff');
      expect(greet()).toBe('Hi Biff!');
    });
  });

});

Swapping AngularJS module parameters for testing

Answer №1

Answer №2

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