}

        final Deferred<T> deferred = new Deferred<>();
        try {
            processRequest(client, deferred);
        } catch (final Exception e) {
            throw new SuggesterException("Failed to execute request: " + getClass().getSimpleName(), e);
        }
        return deferred.promise();
    }

    /**
     * Processes the request.
     * @param client The OpenSearch client.

    @Test
    public void test_execute_exceptionThrown() {
        thumbnailManager.setThrowException(true);
        thumbnailManager.setExceptionMessage("Purge failed");

        String result = purgeThumbnailJob.execute();

        assertTrue(result.contains("Purge failed"));
    }

    // Test execute with exception thrown (no message)
    @Test
    public void test_execute_exceptionThrownNoMessage() {

     * @return the parsed invoker request. Caller must start by checking {@link InvokerRequest#parsingFailed()} as
     * if there are parser errors, this request may not be fully processed and should immediately be failed.
     */
    @Nonnull
    InvokerRequest parseInvocation(@Nonnull ParserRequest parserRequest);

                webAuthenticationService.store(entity);
                saveInfo(messages -> messages.addSuccessCrudCreateCrudTable(GLOBAL));
            } catch (final Exception e) {
                logger.warn("Failed to process a request.", e);
                throwValidationError(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)),
                        this::asEditHtml);
            }

                // When
                int bytesRead = response.readBytesWireFormat(buffer, pos);

                // Then
                assertEquals(4, bytesRead, "Failed at position " + pos);
            }
        }

        @Test
        @DisplayName("Should handle buffer with exact required size")

        assertEquals("newpassword", testLdapManager.changePasswordPassword);
        assertTrue(testLdapManager.changePasswordCalled);
    }

    @Test
    public void test_changePassword_failure() {
        // Test failed password change when LDAP admin sync is disabled
        testLdapManager.changePasswordResult = false;
        testFessConfig.ldapAdminSyncPassword = false;

                    httpEntity = response.getEntity();
                    consumer.accept(response, httpEntity);
                } catch (final Exception e) {
                    logger.warn("Failed to authenticate with form-based authentication: scheme={}, url={}", scheme, request.getRequestUri(),
                            e);
                } finally {
                    try {

                Paths.get(JAVA_IO_TMPDIR.value()), /* prefix= */ null, directoryPermissions.get())
            .toFile();
      } catch (IOException e) {
        throw new IllegalStateException("Failed to create directory", e);
      }
    }

    @Override
    File createTempFile(String prefix) throws IOException {
      return java.nio.file.Files.createTempFile(

            } else if (e instanceof java.lang.reflect.InvocationTargetException) {
                // Method exists but failed to execute, which is acceptable in test environment
                assertTrue("Method invocation failed in test environment", true);
            } else {
                fail("Failed to test getExpiredTime method: " + (message != null ? message : e.getClass().getSimpleName()));
            }
        }
    }

            onConnectListenerList.forEach(l -> {
                try {
                    l.onConnect();
                } catch (final Exception e) {
                    logger.warn("Failed to invoke onConnect listener: listener={}", l.getClass().getName(), e);
                }
            });

            connected = true;
        } else {
            logger.warn("Could not connect to {}", address);