Exploring Angular 1.x, utilizing both ES5 and ES6, and incorporating Karma for comprehensive testing

I am currently developing tests for an angular app that consists of a mix of ES5 and ES6 files. To transpile the ES6 files, I am using babel CLI with the options --modules system --module-ids. Here is an example of what I have:

ES5 file:

angular.module('app').controller('A', function($scope) {
    ...
});

ES6 file:

export class B {
    constructor($scope) {
        this.$scope = $scope 
    }

   ...
}

Additionally, I have a file called boot.js:

import {B} from 'controllers/B';

angular.module('app').controller('B', B);

On my page, I import the boot file using es6-module-loader and bootstrap the angular app:

System.import('boot').then(function() {
    angular.bootstrap(document, ['app']);
});

Now, I believe that I need to handle loading boot.js before running my tests in karma. Currently, I am doing this by calling System.import('boot') in my test files, but it doesn't seem like the most efficient approach:

'use strict';

System.import('boot');

describe('Controller: B', function() {
    beforeEach(module('app'));

    var $scope;

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

        $controller('B', {$scope: $scope}); 
    }));

    it('...', function() {

    });
});

Is there a better way to handle this situation?

Answer №1

I was able to solve the issue by leveraging karma-systemjs.

To set up your test files with systemjs, make sure to include them in the systemjs/files section:

 systemjs: {
     files: [
         // TEST FILES
     ],

     configFile: 'system.config.js',

     config: {
         paths: {
             'angular-mocks': 'node_modules/angular-mocks/angular-mocks.js'
         }
     }
}

Instead of using this in your tests:

System.import('boot');

Try the following approach:

'use strict';

import 'angular-mocks';
import 'angular/boot.js';

describe('Controller: B', function() {
    beforeEach(module('app'));

    var $scope;

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

        $controller('B', {$scope: $scope); 
    }));

    it('...', function() {

    });
});

Hopefully, this solution will benefit others facing the same issue.

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