Imagine a scenario where there is a service in my application that relies on a value stored in $rootScope. The example below shows a simple service that does this:
angular.module('myServices', [])
.factory('rootValGetterService', function($rootScope) {
return {
getVal: function () {
return $rootScope.specialValue;
}
};
});
In order to unit test this service by setting a value in $rootScope, what would be the most effective approach to take?
...
let mainScope;
beforeEach(inject(function(_$rootScope_) {
mainScope = _$rootScope_;
}));
...
Using the provide() method allows you to insert a new $rootScope:
describe('in rootValGetter', inject(function ($rootScope) {
var scope;
var testRootValGetter;
beforeEach(function () {
scope = $rootScope.$new();
module(function ($provide) {
$provide.value('$rootScope', scope);
});
inject(function ($injector) {
testRootValGetterService = $injector.get('rootValGetterService');
});
});
it('getVal returns the value from $rootScope', function() {
var value = 12345;
scope.specialValue = value;
expect(testRootValGetterService.getVal()).toBe(value);
}
}
Firstly, make sure to add angular-mocks.js to your project. After that, employ the angular.mock.inject function:
Rather than creating a new scope by injecting $scope, an alternative approach is to directly mock the necessary properties into $rootScope.
By doing this, $rootScope will have those properties available for use in your testing code.
This is how I tackled the same issue and found a solution.
The provided code snippet should be effective in your scenario.
beforeEach(inject(function($rootScope) {
$rootScope.customProperty = 'example';
}));
Make sure to provide a detailed response that includes the test case:
...
var $rootScope;
beforeEach(inject(function(_$rootScope_) {
$rootScope = _$rootScope_;
}));
...
it('Ensure getVal returns the correct value from $rootScope', function() {
var value = 12345;
$rootScope.specialValue = value;
expect(testRootValGetterService.getVal()).toBe(value);
}
This is my approach:
Running a unique test using some unusual conditions:
it('some peculiar test case', function($rootScope, Translator){
$rootScope.language = 'en';
expect(Translator('summary').toBe('Summary');
}
Sharing this solution in hopes that it may assist others facing a similar issue.
let rootValExtractor;
beforeEach(inject(function($rootScope, $injector) {
$rootScope.customValue = "example";
rootValExtractor = $injector.get('rootValExtractor');
}));
it("Verifies the existence of a service", function () {
expect(rootValExtractor).not.toBeNull();
});
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