The method beforeEach in angular2/testing seems to be failing as it is not

Currently, I am utilizing Gulp, Gulp-Jasmine, and SystemJS to conduct tests on an Angular2 demo application. The setup is fairly straightforward. I have successfully implemented a System.config block and loaded the spec file. However, I encounter an error when attempting to execute the beforeEach block with the following message...

{ [Error: TypeError: _global.beforeEach is not a function at Object.eval (D:/ng2demo/node_modules/angular2/src/testing/matcher s.js:26:9) at eval (D:/ng2demo/node_modules/angular2/src/testing/matchers.js:20 5:4) at eval (D:/ng2demo/node_modules/angular2/src/testing/matchers.js:20 6:3) at eval (native) at Object.eval (D:/ng2demo/node_modules/angular2/src/testing/testing .js:10:18) at eval (D:/ng2demo/node_modules/angular2/src/testing/testing.js:245 :4) at eval (D:/ng2demo/node_modules/angular2/src/testing/testing.js:246 :3) at eval (native) Evaluating D:/ng2demo/node_modules/angular2/src/testing/matchers.js Evaluating D:/ng2demo/node_modules/angular2/src/testing/testing.js Evaluating D:/ng2demo/node_modules/angular2/testing.js Error loading D:/ng2demo/app/assets/services/config.service.spec.js] originalErr: [TypeError: _global.beforeEach is not a function] }

The gulp task I am using is provided below:

var gulp = require('gulp');
var jasmine = require('gulp-jasmine');
var System = require('systemjs');

gulp.task('newtest', () => {
    System.config({
        baseURL: "",
        transpiler: 'typescript',
        defaultJSExtensions: true,
        packages: {
            app: {
                format: 'register',
                defaultExtension: 'js'
            },
        },      
        map:{           
            'angular2':'node_modules/angular2',
            'rxjs':'node_modules/rxjs',
        },
    });

    Promise.all([
        System.import('app/assets/services/config.service.spec'),
    ]).then(function(){     
        gulp.src(['app/assets/services/config.service.spec'])
            .pipe(jasmine())
    }).catch(console.error.bind(console));
});

The content of my spec file is as follows:

/// <reference path="../../../typings/browser/ambient/systemjs/index.d.ts"/>
/// <reference path="../../../typings/browser/ambient/jasmine/index.d.ts"/>

import {Injector, provide} from "angular2/core";
import {Http, BaseRequestOptions, Response, ResponseOptions} from "angular2/http";
import {MockBackend} from "angular2/http/testing";
import {ConfigService} from "./config.service";
import {it, describe, beforeEach, inject, expect} from "angular2/testing";

describe("ConfigService", () => {

    // THIS IS THE LINE THAT FAILS !!!
    beforeEach(() => {
        //Do some prep
    });
    it("it does a test and evals to true", () => {
        expect(true).toBe(true);
    });
});
  • What could be causing this error, and how can I resolve it?
  • Is there a better approach than including reference paths at the top of the spec file?

Answer №1

A problem has occurred: TypeError: _global.beforeEach is not a function at Object.eval

The issue arises from the angular2/testing module, which you can investigate further by checking out the source code. The error occurs because it attempts to import beforeEach from the global object where it doesn't exist. Simply importing jasmine won't resolve this, as it doesn't affect the global object in node.js environments.

How can I resolve this error?

To address this issue, there are a few recommended steps. If you plan to execute the code in a web browser, consider testing it there instead of node.

  1. Refer to the (incomplete) testing guide in the angular2 docs. This involves setting up an HTML file for running tests, though it may not suit automation with gulp.
  2. Utilize an angular2 seed project or a similar resource as a reference for utilizing Angular2, SystemJs, Jasmine, and Karma together. You can configure Karma to use PhantomJS if desired, with the default being Chrome.

Is there a more efficient way than using reference paths at the top of the spec file?

An improved approach has been available since Typescript 1.5, highly recommended for development. Integrate a tsconfig.json file into your project's root directory, already implemented in the linked angular2 seed project.

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