assertTrue(result.isPresent());
        assertEquals(Locale.JAPAN, result.get());
    }

    // Test findBusinessLocale with language only (no country)
    @Test
    public void test_findBusinessLocale_withLanguageOnly() {
        // Setup mock config
        FessConfig mockConfig = new FessConfig.SimpleImpl() {
            @Override
            public String getQueryBrowserLangParameterName() {