assertFalse(customEnv.is("bool.off"));
        assertTrue(customEnv.is("bool.1"));
        assertFalse(customEnv.is("bool.0"));
    }

    // Test exception when property not found
    public void xtest_propertyNotFound() {
        FessEnv.SimpleImpl emptyEnv = new FessEnv.SimpleImpl() {
            protected Properties prepareProperties() {
                return new Properties();
            }
        };