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Testing Asynchronous Services

Explore how to test asynchronous services in Angular applications using two key utilities: waitForAsync and fakeAsync. Understand their differences, usage with observables, and how to write effective unit tests that handle asynchronous code in components.

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Angular testing utilities

Angular testing utilities provide two artifacts to tackle asynchronous testing scenarios:

  • waitForAsync: An asynchronous approach to unit test asynchronous services. It is combined with the whenStable method of ComponentFixture.

  • fakeAsync: A synchronous approach to unit test asynchronous services. It is used in combination with the tick function.

Both approaches provide roughly the same functionality; they only differ ...