Fatal error: The main module could not be located. Please check the path `/src/test.ts` for resolution errors

I am encountering an issue while trying to execute the unit test for my Angular 2 Application using ng test. The error message I keep receiving is:

ERROR in Entry module not found: Error: Can't resolve 

'/Users/username/Dev/dashboard/src/test.ts' in '/Users/username/Dev/dashboard/node_modules/@angular/cli/models/webpack-configs'
28 07 2017 15:18:35.337:WARN [launcher]: Chrome have not captured in 60000 ms, killing.
28 07 2017 15:18:35.441:INFO [launcher]: Trying to start Chrome again (1/2).
28 07 2017 15:19:35.447:WARN [launcher]: Chrome have not captured in 60000 ms, killing.
28 07 2017 15:19:35.587:INFO [launcher]: Trying to start Chrome again (2/2).

The version of Angular CLI after npm update is: @angular/cli: 1.2.6 and the Node version being used is: node: 8.0.0

It's worth noting that other commands like ng build -prod and ng serve are functioning correctly without any errors, allowing me to access the application on the browser.

A few days ago, I deleted all the .spec.ts files from the directories as methods such as:

describe(), beforeEach(), it()

were unable to be located. Upon investigation, I discovered that removing these files did not cause the app to break. However, today I recreated them in order to run the unit tests for the application.

If you have any insights or suggestions, they would be greatly appreciated. Thank you.

angularunit-testingtypescriptangular-cli

Answer №1

I encountered a similar issue like yours, which leads me to believe that your test.ts file is missing. Here is what the content should look like:

// This file is required by karma.conf.js and loads recursively all the .spec and framework files
import 'zone.js/dist/long-stack-trace-zone';
import 'zone.js/dist/proxy.js';
import 'zone.js/dist/sync-test';
import 'zone.js/dist/jasmine-patch';
import 'zone.js/dist/async-test';
import 'zone.js/dist/fake-async-test';
import { getTestBed } from '@angular/core/testing';
import {
  BrowserDynamicTestingModule,
  platformBrowserDynamicTesting
} from '@angular/platform-browser-dynamic/testing';

// Unfortunately there's no typing for the `__karma__` variable. Just declare it as any.
declare const __karma__: any;
declare const require: any;

// Prevent Karma from running prematurely.
// tslint:disable-next-line:only-arrow-functions
__karma__.loaded = function () {};

// First, initialize the Angular testing environment.
getTestBed().initTestEnvironment(
  BrowserDynamicTestingModule,
  platformBrowserDynamicTesting()
);
// Then we find all the tests.
const context = require.context('./', true, /\.spec\.ts$/);
// And load the modules.
context.keys().map(context);
// Finally, start Karma to run the tests.
__karma__.start();

To fix this, simply save it in app/src/test.ts and rerun ng test.

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