How can I mock async methods using Mockito?

How can I mock async methods using Mockito?

You can use Mockito's when method along with CompletableFuture to mock async methods. For example, if you have a method that returns a CompletableFuture<String>, you can do something like this: when(yourAsyncMethod()).thenReturn(CompletableFuture.completedFuture("mocked value"));

What if my async method throws an exception?

You can simulate exceptions by using when with thenThrow. For instance: when(yourAsyncMethod()).thenThrow(new RuntimeException("mocked exception")); This will allow you to test how your code handles exceptions.

Can I verify that the async method was called?

Yes, you can use verify to check if the async method was called. For example: verify(yourMock).yourAsyncMethod(); This will confirm that the method was invoked.

Are there any best practices for mocking async methods?

Some best practices include keeping your mocks simple, avoiding over-mocking, and ensuring your tests are readable. Also, consider using ArgumentCaptor to capture arguments passed to async methods.