case "filter.null":
                    // This would be filtered to null by PropertyFilter in real scenario
                    throw new ConfigPropertyNotFoundException("filter.null");
                default:
                    throw new ConfigPropertyNotFoundException(propertyKey);
                }
            }
        };

        ComponentUtil.register(fessConfig, "fessConfig");
    }

    @Override

            fail("Should throw ConfigPropertyNotFoundException");
        } catch (ConfigPropertyNotFoundException e) {
            assertTrue(e.getMessage().contains("non.existent.property"));
        }

        try {
            emptyEnv.is("non.existent.boolean");
            fail("Should throw ConfigPropertyNotFoundException");
        } catch (ConfigPropertyNotFoundException e) {

    // Test property not found exception
    public void test_propertyNotFound() {
        try {
            fessConfig.get("non.existent.property");
            fail("Should throw ConfigPropertyNotFoundException");
        } catch (ConfigPropertyNotFoundException e) {
            assertEquals("non.existent.property", e.getMessage());
        }
    }

    // Test isExtensionAllowed method
    /*