$httpBackend expectGET not returning expected data - angularjs

Question

I will just start out saying that $httpBackend and spyOn are pretty new to me, and I am struggling to get a clear picture of what is happening. Basically, I'm trying to do an $httpBackend.expectGET('/myroute/').respond(...) and then use spyOn, but I keep getting
Expected [ ] to equal Object({ success: true, message: 'Yeah!' })
Here's the code I'm trying to test:
angular.module('TestModule')
.service('TestService',TestService);
TestService.$inject = ['$http'];
function TestService($http){
var service = {};
service.DoIt = DoIt;
return service;
function DoIt() {
return $http.get('/myroute/')
.then(handleSuccess,handleError('Error happened!'));
}
function handleSuccess(res) {
return res.data;
}
function handleError(error) {
return function(){
return {success: false, message: error}
};
}
}
Here's my Karma-Jasmine test:
describe('Test Module',function(){
beforeEach(module('TestModule'));
describe('TestService Tests',function(){
var service,$httpBackend;
beforeEach(inject([
'$injector',
function($injector){
$httpBackend = $injector.get('$httpBackend');
service = $injector.get('TestService');
}
]));
afterEach(function(){
$httpBackend.verifyNoOutstandingExpectation();
$httpBackend.verifyNoOutstandingRequest();
});
it('should DoIt',function(){
var mockResponse = {
data : {success:true, message:"Yeah!"}
};
$httpBackend.expectGET('/myroute')
.respond(Promise.resolve(mockResponse));
spyOn(service,'DoIt').and.callThrough();
service.DoIt().then(function(data){
expect(service.DoIt).toHaveBeenCalled();
expect(data).toEqual(mockResponse.data); <-- ERROR OCCURS HERE -->
});
$httpBackend.flush();
});
});
});
Further information:
Using the example I found here: http://www.bradoncode.com/blog/2015/06/26/unit-testing-http-ngmock-fundamentals/, I tried this in my test code:
it('should DoIt',inject(function($http){
var promise = $http.get('/myroute').then(handleSuccess,handleError('bad stuff happened'));
promise.then(function(data){
console.log('Data: ' + JSON.stringify(data,null,3));
});
$httpBackend.expect('GET','/myroute').respond(200,{data:'Yeah!'});
$httpBackend.flush();
}));
function handleSuccess(response) {return response.data;}
function handleError(error){
return function(){
return {success:false,message:error};
};
}
This gives me the response that I expect: 'Data: {"data": "yeah"}'
My updated question: I thought service.DoIt() was doing the same thing as the promise. What is going on here? Am I not injecting my service? I do not understand how Karma expects me to stage this test. Any help, please!

Answer 1

If I understand your intention with the test correctly, I believe this is what you need:
describe('Test Module', function() {
var $httpBackend, service;
beforeEach(module('TestService'));
beforeEach(inject(function(_$httpBackend_, _TestService_) {
$httpBackend = _$httpBackend_;
service = _TestService_;
}));
afterEach(function() {
$httpBackend.verifyNoOutstandingExpectation();
$httpBackend.verifyNoOutstandingRequest();
});
it('should DoIt', function() {
var mockResponse = {
data: { success: true, message: "Yeah!" }
};
$httpBackend.expectGET('/myroute/')
.respond(mockResponse);
service.DoIt().then(function(data) {
expect(data).toEqual(mockResponse);
});
$httpBackend.flush();
});
});

Answer 2

In my case there was transformResponse function on $resource that modified the expected mock data:
var resource = $resource('api/data/:id', {}, {
get: {
method: 'GET',
isArray: true,
transformResponse: function (data) {
var d = angular.fromJson(data);
return d.members;
}
}
...
My mock data didn't contain memebers...