Angular · Middle · Question 48 of 75

How do you test a service that uses `HttpClient` without real network calls?

✓Correct answer: Provide provideHttpClient() and provideHttpClientTesting(), then use HttpTestingController to expect and flush requests
2Start a real server for each test
3Replace window.fetch with a function returning undefined

Explanation

httpTesting.expectOne('/api/users').flush([...]) returns a fake response, and verify() in afterEach ensures no unexpected requests were made.

Further reading

Angular: Testing HTTP requests ↗

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