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Angular2AppUnderTest: Google Books API + Google Books Viewer + fakeAsync + test schedulers

CircleCI

This project was generated with Angular CLI version 1.1.2.

It uses:

It shows how to:

  • take advantage of the fakeAsync testing approach
  • fix timing issues by sharing the same time between the zone and RxJs
  • inject your own schedulers in order to test RxJs events

How to start

Since the Google Books API need to be "proxied" via proxy.conf file you need to start the server by issuing npm run start.

Nevertheless, Google Books API might or might not work without the API key. The API key is secret and therefore not under version control. A custom environment file is being used to add the Google API key:

  1. create the file ./src/environments/environment.custom.ts
  2. add this content:
export const environment = {
    production: false,
    GOOGLE_BOOKS_API_KEY: 'your_api_key'
};
  1. execute npm run start-custom

How to test

execute the tests as usual: ng test

Hints to files you might be interested in

  • src/app/internals/fake-zone-and-test-scheduler-test.spec.ts: helps to understand the fakeAsync utility and demonstrates the usage of the own scheduler
  • src/app/internals/async-zone-time-in-sync-keeper.utils.ts: introduces the "in-sync-keeper" utility for fixing fakeAsync timing issues
  • src/app/internals/spying-test-scheduler.ts: custom RxJs test scheduler
  • src/app/internals/monkey-patch-scheduler.utils.ts: injects the spying test scheduler for testing purposes
  • **/*.spec.ts: the actual usage of the testing utilities mentioned above