Exception exception = new RuntimeException("test");
    UncheckedExecutionException e =
        assertThrows(
            UncheckedExecutionException.class,
            () -> timeLimiter.callWithTimeout(callableThrowing(exception), DELAY_MS, MILLISECONDS));
    assertThat(e.getCause()).isEqualTo(exception);
  }

  public void testCallUninterruptiblyWithTimeout_propagatesReturnValue() throws Exception {
    String result =

This diagram shows `HTTPException`, but you could also raise any other exception that you catch in a dependency with `yield` or with a [Custom Exception Handler](../handling-errors.md#install-custom-exception-handlers){.internal-link target=_blank}.

    /**
     * @throws Exception
     */
    @Test
    public void testClose() throws Exception {
        final NotifyOutputStream out = new NotifyOutputStream();
        CloseableUtil.close(out);
        assertThat(out.getNotify(), is("closed"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testCloseNull() throws Exception {
        CloseableUtil.close((OutputStream) null);

  private static final ExecutorService executor = Executors.newFixedThreadPool(1);

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    service = SimpleTimeLimiter.create(executor);
  }

  public void testNewProxy_goodMethodWithEnoughTime() throws Exception {
    SampleImpl target = new SampleImpl(DELAY_MS);
    Sample proxy = service.newProxy(target, Sample.class, ENOUGH_MS, MILLISECONDS);

import org.codelibs.core.exception.EmptyArgumentException;
import org.codelibs.core.exception.NoSuchConstructorRuntimeException;
import org.codelibs.core.exception.NoSuchFieldRuntimeException;
import org.junit.Test;

/**
 * @author higa
 */
public class ClassUtilTest {

    /** */
    public static final String HOGE = "hoge";

    /**
     * @throws Exception
     */

    assertThat(e).hasCauseThat().isSameInstanceAs(exception);
    assertEquals(Service.State.FAILED, service.state());
  }

  public void testFunctionalStop_failed() {
    final Exception exception = new Exception("deliberate");
    AbstractIdleService service =
        new DefaultService() {
          @Override
          protected void shutDown() throws Exception {
            throw exception;
          }
        };

```

## Install custom exception handlers

You can add custom exception handlers with <a href="https://www.starlette.io/exceptions/" class="external-link" target="_blank">the same exception utilities from Starlette</a>.

Let's say you have a custom exception `UnicornException` that you (or a library you use) might `raise`.

And you want to handle this exception globally with FastAPI.

    private Model read(String pom) throws Exception {
        String resource = "/poms/validation/" + pom;
        try (InputStream is = getClass().getResourceAsStream(resource)) {
            assertNotNull(is, "missing resource: " + resource);
            return new Model(new MavenStaxReader().read(is));
        }
    }

    private SimpleProblemCollector validate(String pom) throws Exception {

  }

  public void testSuccessful() throws Exception {
    assertThat(future.set(1)).isTrue();
    assertSuccessful(future, 1);
  }

  public void testFailed() throws Exception {
    Exception cause = new Exception();
    assertThat(future.setException(cause)).isTrue();
    assertFailed(future, cause);
  }

  public void testCanceled() throws Exception {

    }

    abstract boolean isPermitted(Exception exception);

    void assertPermitted(Exception exception) {
      if (!isPermitted(exception)) {
        String message =
            "Exception "
                + exception.getClass().getSimpleName()
                + " was thrown; expected "
                + getMessage();
        throw new AssertionError(message, exception);
      }
    }