private static final Pattern OID_PATTERN = Pattern.compile("\\d+(?:\\.\\d+)+");

    @Test
    @DisplayName("Constant values match expected OIDs")
    void constantValues() {
        assertEquals("1.3.6.1.5.5.2", SpnegoConstants.SPNEGO_MECHANISM, "SPNEGO_MECHANISM mismatch");
        assertEquals("1.2.840.113554.1.2.2", SpnegoConstants.KERBEROS_MECHANISM, "KERBEROS_MECHANISM mismatch");

 * demonstrates that the interface can be mocked if another class
 * depends on it.
 */
public class WinErrorTest {

    @Nested
    @DisplayName("Constant value checks")
    class ConstantValues {
        @Test
        void successIsZero() {
            assertEquals(0, WinError.ERROR_SUCCESS, "ERROR_SUCCESS should be 0");
        }

        @Test
        void accessDeniedIsFive() {