assertNotNull(ResolverType.RESOLVER_LMHOSTS, "RESOLVER_LMHOSTS should not be null.");
    }

    /**
     * Tests the total number of enum constants.
     */
    @Test
    void testNumberOfEnumConstants() {
        // Ensure there are exactly 4 resolver types
        assertEquals(4, ResolverType.values().length, "There should be exactly 4 resolver types.");
    }

    /**