Dean Sherwin Dean Sherwin - 23 days ago 14
AngularJS Question

Load local JSON into Jasmine/Karma Unit Test in AngularJS

I'm testing a callback function which accepts a response object as it's only parameter. This object is the response of a HTTP request made elsewhere so I don't want to user $httpBackend in this test as the request has nothing to do with this function.

It's in home.js which is a controller for the homepage of my app.

Here is the function being tested:

function submitLogin() {
LoginService.login(loginPost, ctrl.username, ctrl.password, successCallback, errorCallback);
}

// gets called in LoginService if login reponse is 201, otherwise errorCallback called
function successCallback(response) {
// get details needed to determine correct forms for user
var sessionData = {
token: response.data.token,
user_id: response.data.user_id,
institution_name: response.data.institution_name,
status: response.data.status,
form_uri: getFormURI(response.data.forms) //extracts form URI for list of available forms for particular app
};

ctrl.formCheckInProgress = true;

// update users forms from backend and cache them
FormFetcherService.updateCachedForms(sessionData.user_id, sessionData.form_uri).then(function (response) {
if (response == 'updated') {
toastr.success('Your forms have been updated to the newest version', 'Forms Updated');
}
else {
toastr.success('Your forms are already up-to-date', 'No Update Required');
}
});


}

Login Service:

angular.module('appName').service('LoginService', ['$http', function ($http) {
this.login = function (url, username, password, successCallback, errorCallback) {
var data = {
username: username,
password: password
};

$http.post(url, $.param(data), {
headers: {
'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
},
timeout: 10000
}
).then(successCallback, errorCallback);
}
}]);


I want to load an object which will take the place of the 'response' object being passed into the function.

Is there any way I could put a .json file in my /tests directory, load the JSON and parse it into a Javascript object and then use said object in my unit test?

I've searched around and most solutions assume a request is being made in the function being tested - which isn't the case here.

Cheers,

Dean

Answer

You can do it like this:

var LoginService, $controller;

var formFetcherService = {
    updateCachedForms: jasmine.createSpy('sessionData');
}

var response = {
    data: {
        user_id: 4,
        forms: 'some'
    }
}

beforeEach(module(function($provide) {
    $provide.value('LoginService', {
        login: function(url, username, password, successCallback, errorCallback) {
            successCallback(response);
        }
    });

    $provide.value('FormFetcherService', formFetcherService);
}))

beforeEach(inject(function(_$controller_) {
    $controller = _$controller_;
});

it('should create sessionData', function() {
    var controller = $controller('HomeController');
    controller.submitLogin();
    expect(formFetcherService.updateCachedForms).toHaveBeenCalledWith(response.user_id, response.form_uri);
});
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