Class ProducersTest

javatests/dagger/producers/internal/ProducersTest.java:39–139

Tests Producers.

 * Tests {@link Producers}.
 */
@RunWith(JUnit4.class)
public class ProducersTest {
  @Test public void createFutureProduced_success() throws Exception {
    ListenableFuture<String> future = Futures.immediateFuture("monkey");
    ListenableFuture<Produced<String>> producedFuture = Producers.createFutureProduced(future);
    assertThat(producedFuture.isDone()).isTrue();
    assertThat(producedFuture.get().get()).isEqualTo("monkey");
  }

  @Test public void createFutureProduced_failure() throws Exception {
    ListenableFuture<String> future = Futures.immediateFailedFuture(new RuntimeException("monkey"));
    ListenableFuture<Produced<String>> producedFuture = Producers.createFutureProduced(future);
    assertThat(producedFuture.isDone()).isTrue();
    assertThat(getProducedException(producedFuture.get()).getCause()).hasMessage("monkey");
  }

  @Test public void createFutureProduced_cancelPropagatesBackwards() throws Exception {
    ListenableFuture<String> future = SettableFuture.create();
    ListenableFuture<Produced<String>> producedFuture = Producers.createFutureProduced(future);
    assertThat(producedFuture.isDone()).isFalse();
    producedFuture.cancel(false);
    assertThat(future.isCancelled()).isTrue();
  }

  @Test public void createFutureProduced_cancelDoesNotPropagateForwards() throws Exception {
    ListenableFuture<String> future = SettableFuture.create();
    ListenableFuture<Produced<String>> producedFuture = Producers.createFutureProduced(future);
    assertThat(producedFuture.isDone()).isFalse();
    future.cancel(false);
    assertThat(producedFuture.isCancelled()).isFalse();
    assertThat(getProducedException(producedFuture.get()).getCause())
        .isInstanceOf(CancellationException.class);
  }

  private <T> ExecutionException getProducedException(Produced<T> produced) {
    try {
      T value = produced.get();
      throw new IllegalArgumentException("produced did not throw, but returned " + value);
    } catch (ExecutionException e) {
      return e;
    }
  }

  @Test public void createFutureSingletonSet_success() throws Exception {
    ListenableFuture<String> future = Futures.immediateFuture("monkey");
    ListenableFuture<Set<String>> setFuture = Producers.createFutureSingletonSet(future);
    assertThat(setFuture.isDone()).isTrue();
    assertThat(setFuture.get()).containsExactly("monkey");
  }

  @Test public void createFutureSingletonSet_failure() throws Exception {
    ListenableFuture<String> future = Futures.immediateFailedFuture(new RuntimeException("monkey"));
    ListenableFuture<Set<String>> setFuture = Producers.createFutureSingletonSet(future);
    assertThat(setFuture.isDone()).isTrue();
    try {
      setFuture.get();
      fail();
    } catch (ExecutionException e) {