What signals to Angular that $httpBackend is substituting $http during the testing of AngularJS?

My factory, called myFactory, has a dependency on $http. When writing tests for this, I needed to mock this dependency. After some research, I discovered that I could accomplish this using $httpBackend. Implementing the code below successfully achieved the mocking, but I am unsure of when Angular recognizes that httpBackend is replacing $http within myFactory.

beforeEach(inject(function(_myFactory_, _$httpBackend_){
    myFactory = _myFactory_;
    $httpBackend = _$httpBackend_;
}));

Answer №1

Instead of replacing $http, it actually replaces a service named $httpBackend that is typically only used internally and not by developers directly. Angular has numerous 'private' services like this one. Normally, $http is injected with the actual $httpBackend, but when angular-mocks.js is loaded after angular.js (the order matters), it essentially swaps out the real $httpBackend with the mock version.

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