props.setProperty("jcifs.smb.client.nativeOs", "CustomOS");
        props.setProperty("jcifs.smb.client.nativeLanMan", "CustomLanman");
        assertDoesNotThrow(() -> SingletonContext.init(props));
        CIFSContext context = SingletonContext.getInstance();
        assertNotNull(context);
        assertEquals("CustomOS", context.getConfig().getNativeOs());

    void testInitDefaultsWithPresetNativeOs() throws CIFSException {
        BaseConfiguration testConfig = new BaseConfiguration(false);
        testConfig.nativeOs = "CustomOS";

        testConfig.initDefaults();

        assertEquals("CustomOS", testConfig.getNativeOs());
    }

    @Test
    @DisplayName("Test initDefaults with various flag combinations")