Karma is an open source JavaScript command-line tool, which is used to spawn a web server to load an application's source code and execute the test. We can configure Karma to run from different browsers. Karma is a command-line tool and will show the results of the application on the command line when the application runs in the browser. Karma is a Node.js application that can be installed through the npm package manager using the following code:
$ npm install --save-dev karma
We used the following command to execute the karma
$ karma start karma.conf.js
We needs to test the following AngularJS's controller
var app = angular.module('myApp', [])
app.controller('ctrlMain', function($scope) {
$scope.name = "Mohammad Majid";
$scope.sayHello = function() {
$scope.greeting = "Hello " + $scope.name;
}
});First, we need to create an actual test file that will be used in the Jasmine framework, since it works well with Karma. Add the following code to the test file:
describe('Unit: ctrlMain', function() {
// Load the module with MainController
beforeEach(module('myApp'));
var ctrl, scope;
// inject the $controller and $rootScope services
// in the beforeEach block
beforeEach(inject(function($controller, $rootScope) {
// Create a new scope that's a child of the $rootScope
scope = $rootScope.$new();
// Create the controller
ctrl = $controller('ctrlMain', {
$scope: scope
});
}));
});The preceding code will be used to test the function sayHello() method simply prepends the $scope.name variable to a $scope.greeting variable.