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Add tests for UseCase schedulers setup. #209

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Add tests for UseCase schedulers setup. #209

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30 changes: 29 additions & 1 deletion domain/src/test/java/com/fernandocejas/android10/sample/domain/interactor/UseCaseTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -26,10 +26,16 @@
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.runners.MockitoJUnitRunner;
import org.mockito.stubbing.Answer;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.BDDMockito.given;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;

@RunWith(MockitoJUnitRunner.class)
public class UseCaseTest {
Expand All @@ -47,7 +53,19 @@ public class UseCaseTest {
public void setUp() {
this.useCase = new UseCaseTestClass(mockThreadExecutor, mockPostExecutionThread);
this.testObserver = new TestDisposableObserver<>();
given(mockPostExecutionThread.getScheduler()).willReturn(new TestScheduler());

// Setup mocked schedulers to run in the same thread where tests are run.
final TestScheduler testScheduler = new TestScheduler();
// Setup mockThreadExecutor behavior
doAnswer(new Answer<Void>() {
@Override public Void answer(InvocationOnMock invocation) throws Throwable {
Runnable arg = (Runnable) invocation.getArguments()[0];
testScheduler.scheduleDirect(arg);
return null;
}
}).when(mockThreadExecutor)
.execute(any(Runnable.class));
given(mockPostExecutionThread.getScheduler()).willReturn(testScheduler);
}

@Test
Expand All @@ -71,6 +89,16 @@ public void testShouldFailWhenExecuteWithNullObserver() {
useCase.execute(null, Params.EMPTY);
}

@Test public void testUseCaseSchedulersUsedCorrectly() throws Exception {
useCase.execute(testObserver, Params.EMPTY);
// Assert correct result
assertThat(testObserver.valuesCount).isZero();

// Verify that executors were used when executing observable
verify(mockPostExecutionThread, times(1)).getScheduler();
verify(mockThreadExecutor, times(1)).execute(any(Runnable.class));
}

private static class UseCaseTestClass extends UseCase<Object, Params> {

UseCaseTestClass(ThreadExecutor threadExecutor, PostExecutionThread postExecutionThread) {
Expand Down