Karma-Jasmine: A Guide to Testing the $translate.use Function

THE ISSUE AT HAND:

While testing the language selection function, I encountered an error message that reads as follows:

TypeError: $translate.use is not a function

I have come across similar queries on platforms like SO and various forums, but the solutions proposed have been ineffective in resolving my problem.

THE CODE SNIPPETS:

Configuration Section:

app.config(function($stateProvider, $urlRouterProvider, $translateProvider) {

$translateProvider.useSanitizeValueStrategy('sanitize');

$translateProvider.translations('EN', {

    "MY_ACCOUNT":                   "My account",
    "PROJECT_LIST":                 "Project List",
    "SETTINGS":                     "Settings",

});

$translateProvider.translations("IT", {

    "MY_ACCOUNT":                   "Mio account",
    "PROJECT_LIST":                 "Lista progetti",
    "SETTINGS":                     "Impostazioni",

});

$translateProvider.preferredLanguage(window.localStorage['language'] || 'EN');

$translateProvider.fallbackLanguage("EN");

Function Implementation:

$scope.select_language = function(language)
    {
        window.localStorage['language_code'] = language.code;

        $translate.use(language.code);

        $rootScope.app_language = language.code;
    }

Testing Procedures:

describe('App tests', function() {

    beforeEach(module('my_app.controllers'));

    beforeEach(inject(function(_$controller_, _$rootScope_)
    {
        $controller = _$controller_;
        $rootScope = _$rootScope_;
        $scope = _$rootScope_.$new();   
        $translate = {};

        var controller = $controller('MainCtrl', { $scope: $scope, $rootScope: $rootScope, $translate: $translate });
    }));

    describe('Language tests', function() 
    {
        it('should properly load select_language function', function()
        {
            $scope.select_language({ name: "italiano", url: "img/italy.png", code: "IT"});
            expect($rootScope.app_language).toEqual("IT");
        });
    });

THE MAIN QUERY:

What could be causing this error to appear?

How can I effectively test the functionality of $translate.use?

Answer №1

If you do not need to test the $translate method because it is not yours, you can simply return an object with a noop method.

describe('App tests', function() {

beforeEach(module('my_app.controllers'));

beforeEach(inject(function(_$controller_, _$rootScope_)
{
    $controller = _$controller_;
    $rootScope = _$rootScope_;
    $scope = _$rootScope_.$new();   
    $translate = {
       use: function(){}
    };

    var controller = $controller('MainCtrl', { $scope: $scope, $rootScope: $rootScope, $translate: $translate });
}));

describe('Language tests', function() 
{
    it('should properly load select_language function', function()
    {
        $scope.select_language({ name: "italiano", url: "img/italy.png", code: "IT"});
        expect($rootScope.app_language).toEqual("IT");
    });
});

If you need to check if it is called with correct parameters, you can create a spy as shown below:

$translate = {
  use: jasmine.createSpy('$translate.use')
}

You can then add it to your expectations like this:

expect($translate.use).toHaveBeenCalledWith(//language code)

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

"Learn how to automatically limit date selection to a maximum of 3 days after choosing a date with the nb-rangepicker rangep

I have successfully implemented the nebular date range picker to filter data. However, I am facing an issue with setting the default maxDate 3 days after selecting the input. I have tried multiple methods but none have worked for me. Below is my TypeScript ...

Is there a way to eliminate all Unicode characters from a string while preserving specific languages like Japanese, Greek, Hindi, and others?

Is there a way to eliminate all Unicode characters from this text【Hello!】★ ああああ I want to get rid of any unusual symbols (【, ★, 】) while retaining "Hello!" and "ああああ". It should work for all languages, not just Japanese. ...

Displaying content inside a directive based on a condition

I am working on a directive that includes an ngShow statement based on a specific attribute or condition that needs to be passed. It's interesting how when I hardcode the ng-show, everything functions correctly. However, if I attempt to assign the val ...

Revise iconic titles [vue-chart.js]

I am working on rendering a Doughnut chart using vue-chart.js. My goal is to edit only the legend labels so that if I have a 'very long string,' it will display as 'very lo...' in the legend, while still showing the full labels on hover ...

React - verifying properties

Here's a question that I've been pondering. In many situations, we find ourselves needing to check if props are undefined. But what about nested props? For example, let's say we have: this.props.data.income.data1.value.chartData and we wa ...

Using PHP, JavaScript, and Bootstrap to display success or error messages for form fields through AJAX

I am working on a form where users input an 'authorisation code' that is then checked against a database using AJAX and PHP. Currently, the form displays a tick if the code is valid and a cross if it is incorrect. I would like to utilize Bootstra ...

What is the best method for storing an image from a webpage onto the server using JavaScript?

Is there a way to save the image with the id 'canvasaImg' on my webpage to the server using JavaScript, or does it need to be done with PHP? ...

Determine the maximum value in the array using the Math.max method with

How exactly does Math.max.apply(null, arr); work? Let's take for example var arr = [45,25,4,65] ; Will it compare 'null' and '45' and return the maximum number between the two, like 45? After comparing, will it then compare t ...

How can one transform an array (in the form of a JSON array) into a map?

After running my script, I receive an array (JSON Array) structured like this: [{redirectCount=0, encodedBodySize=60962, unloadEventEnd=0, responseEnd=1601.699999999255, domainLookupEnd=995.7999999896856, ... Now, I want to display the key-value pairs fr ...

Navigation bar in reactjs remains visible even after clicking on an icon button, causing a temporary issue with

I'm facing an issue with my navigation bar created using material-ui. I have an onClick function set up so that when the user clicks the icon button, the navigation redirects to a new page and then should close. However, no matter what I try, the navi ...

Utilizing JavaScript in AJAX Responses

Can I include JavaScript in an AJAX response and run it, or should I only use JSON or plain HTML for a more elegant solution? I'm trying to figure out the best way to handle AJAX requests that involve inserting HTML or running JavaScript based on user ...

Automatically bookmark webpages using JavaScript in your browser

I am hoping to trigger the add to bookmark action upon page load using JavaScript or jQuery. ...

Encountering issues with Angular component test cases: receiving a Type Error stating it cannot read the property "contractno" as it is undefined

When attempting to inject the default dependency required to run the spec file without errors, I encountered a Type Error: Cannot read property "contractno" of undefined. /** This is the userModel Class **/ export class UserModel { contractNo: string; ...

What makes Nuxt/auth so highly secure?

Picture this scenario: a visitor lands on your Nuxt.js website's homepage. They proceed to authenticate themselves using @nuxtjs/auth-next. After successfully logging in, they gain access to a protected page meant exclusively for authenticated users. ...

Is there a way to show additional information beyond just the title in FullCalendar?

Hello, I am currently using the full calendar plugin and have a question. While I can display the title of events on my calendar, I would also like to display additional information from my database (such as full name or description) alongside the title. H ...

Tips for retrieving values from CheckBox in Asp.net MVC using Jquery

I'm currently facing a dilemma while working on an MVC web application. I have dynamically generated checkboxes from my database, but I am uncertain about how to extract the value of the selected checkbox and store it in the database. Any suggestions? ...

Strategies for creating a dynamic progress bar using jQuery and JavaScript

I'm currently working on a project that involves increasing a percentage number while filling up the background color inside it based on the percentage value. The current setup is functional in terms of animating the background, but I need it to dynam ...

Transform specific data binding values into JSON format using Knockout.js

Just dipping my toes into the world of knockoutjs, I've got this viewmodel set up: var Testing = function(){ this.Username = ko.observable(""); this.Password = ko.observable(""); this.email = ko.observable(""); } I'm tasked with ...

jquery events such as onSubmit, onComplete, etc. are commonly used

It's interesting to observe that many tools in jQuery, especially those involving ajax, contain hooks like onSubmit, onComplete, and more. Is there a specific term for this practice and the standards associated with it? Does this practice belong sol ...

send the variable to the deferred done function

Having trouble passing a variable into a done callback. var getDataForCompany = function(company_id) { $.ajax({ type: "post", url: url, data:{ company_id: company_id } }).done(function(returnedData, textStatus, j ...