Can I delay a stubbed method response with Mockito?

Question

I\'m writing unit tests now. I need to simulate long-run method with Mockito to test my implementation\'s timeout handling. Is it possible with Mockito?

Something li

Answer 1

I created a utils for this:

import java.time.Duration;
import java.util.concurrent.TimeUnit;

import static org.mockito.Mockito.doAnswer;

public class Stubber {

    public static org.mockito.stubbing.Stubber doSleep(Duration timeUnit) {
        return doAnswer(invocationOnMock -> {
            TimeUnit.MILLISECONDS.sleep(timeUnit.toMillis());
            return null;
        });
    }

    public static  org.mockito.stubbing.Stubber doSleep(Duration timeUnit, E ret) {
        return doAnswer(invocationOnMock -> {
            TimeUnit.MILLISECONDS.sleep(timeUnit.toMillis());
            return ret;
        });
    }

}

and in your test case simply use:

doSleep(Duration.ofSeconds(3)).when(mock).method(anyObject());