// Try to execute - should be blocked with CIFSException
        CIFSException exception = assertThrows(CIFSException.class, () -> {
            circuitBreaker.executeWithCircuitBreaker(() -> "should not execute");
        }, "Circuit breaker should throw CIFSException when open");

        assertTrue(exception.getMessage().contains("Circuit breaker 'test' is open"), "Exception message should indicate circuit is open");
    }

    @Test

    }

    /**
     * @throws Exception
     */
    @Test
    public void testLtrim() throws Exception {
        assertEquals("1", "trim", StringUtil.ltrim("zzzytrim", "xyz"));
        assertEquals("2", "", StringUtil.ltrim("xyz", "xyz"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testRtrim() throws Exception {

  public void testFlush_flushableWithEatenException() throws IOException {
    // make sure that no exception is thrown if 'swallowException' is true
    // when the mock does throw an exception on flush.
    setupFlushable(true);
    doFlush(mockFlushable, true, false);
  }

  public void testFlush_flushableWithThrownException() throws IOException {
    // make sure that the exception is thrown if 'swallowException' is false

     */
    @Rule
    public ExpectedException exception = ExpectedException.none();

    /**
     * @throws Exception
     */
    @Before
    public void setUp() throws Exception {
        TimeZone.setDefault(TimeZone.getTimeZone("GMT"));
    }

    /**
     * @throws Exception
     */
    @After
    public void tearDown() throws Exception {
        TimeZone.setDefault(null);
    }

    /**

## Install custom exception handlers { #install-custom-exception-handlers }

You can add custom exception handlers with [the same exception utilities from Starlette](https://www.starlette.dev/exceptions/).

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.

        final LlmException exception = new LlmException("Error occurred", cause);
        assertEquals("Error occurred", exception.getMessage());
        assertSame(cause, exception.getCause());
    }

    @Test
    public void test_extendsFromFessSystemException() {
        final LlmException exception = new LlmException("Test");
        assertTrue(exception instanceof FessSystemException);
        assertTrue(exception instanceof RuntimeException);

    @Test
    public void test_initializeProbes() {
        // Test that initializeProbes doesn't throw exception
        try {
            ThumbnailGenerator.initializeProbes();
            // If no exception thrown, test passes
            assertTrue(true);
        } catch (Exception e) {
            fail("initializeProbes should not throw exception: " + e.getMessage());
        }
    }

    @Test
    public void test_main_withHelp() {

  @Param Result result;
  @Param ExceptionType exceptionType;

  /**
   * The number of other exception types in the cache of known-good exceptions and the number of
   * other {@code ClassValue} entries for the exception type to be tested. This lets us evaluate
   * whether our solution scales to use with multiple exception types and to whether it is affected

                } catch (Exception e) {
                    // Expected to catch exception silently
                }
            }
        };

        FwAssistantDirector assistantDirector = createMockAssistantDirector();

        // Should handle ClassNotFoundException gracefully
        customHook.hook(assistantDirector);

        // Verify no exception is thrown to the caller
        assertTrue(true);

  public void testFailOnExceptionFromRun() throws Exception {
    TestService service = new TestService();
    service.runException = new Exception();
    service.startAsync().awaitRunning();
    service.runFirstBarrier.await();
    service.runSecondBarrier.await();
    assertThrows(CancellationException.class, () -> future.get());
    // An execution exception holds a runtime exception (from throwables.propagate) that holds our