nameServiceClient.getByName(null);
        }, "Should throw UnknownHostException for null hostname");
    }

    @Test
    @DisplayName("Should handle empty hostname in getByName")
    void testGetByNameWithEmpty() {
        // When/Then
        assertThrows(UnknownHostException.class, () -> {
            nameServiceClient.getByName("");
        }, "Should throw UnknownHostException for empty hostname");
    }