How to Mock Nondeterministic Responses in ExecutorCompletionService with Mockito?

Mocking Nondeterministic Responses in ExecutorCompletionService with Mockito

Testing the behavior of an ExecutorCompletionService when tasks return nondeterministic values can be challenging. However, Mockito provides a solution to simulate such scenarios.

In this situation, you can use Mockito's thenReturn method to specify multiple return values for a stubbed method. This allows you to control the order in which values are returned, ensuring that the outcome remains consistent regardless of the execution order.

To achieve this, simply specify the stubbed method call followed by a list of values to be returned in order. For example:

when(completionService.take().get()).thenReturn(value1, value2, value3);

In this example, value1 will be returned the first time take() is called, value2 will be returned the second time, and so on. Once all values have been returned, value3 will be returned repeatedly for subsequent calls.

By utilizing this technique, you can test the behavior of your code when dealing with nondeterministic task results, ensuring that the desired outcome is achieved regardless of the order in which tasks are completed.

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