assertTrue(result1.isPresent());
        assertTrue(result2.isPresent());
        assertTrue(result3.isPresent());
        assertEquals(Locale.GERMANY, result1.get());
        assertEquals(Locale.GERMANY, result2.get());
        assertEquals(Locale.GERMANY, result3.get());
    }

    // Helper method to create mock RequestManager
    private RequestManager createMockRequestManager(final String paramValue) {

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## Powered By

* [Lasta Di](https://github.com/lastaflute/lasta-di "Lasta Di"): DI Container

        assertFalse(result.isPresent());

        result = provider.determineAlias(Locale.JAPANESE);
        assertFalse(result.isPresent());

        result = provider.determineAlias(Locale.GERMAN);
        assertFalse(result.isPresent());

        result = provider.determineAlias(null);
        assertFalse(result.isPresent());
    }

    @Test
    public void test_determineAlias_multipleLocales() {