@Test
        void verifyCustomSource() {
            val theme = themeSource.getTheme("my-theme");
            assertNotNull(theme);
            val message = theme.getMessageSource().getMessage("cas.theme.name",
                ArrayUtils.EMPTY_OBJECT_ARRAY, Locale.getDefault());
            assertEquals("MyTheme", message);
        }
This is {@link DefaultCasThemeSourceTests}.

@author Misagh Moayyed
@since 6.6.0
support/cas-server-support-themes/src/test/java/org/apereo/cas/services/web/DefaultCasThemeSourceTests.java