// Then
        assertSame(mockCredentials, unwrapped);
        verify(mockCredentials).unwrap(Credentials.class);
    }

    @Test
    @DisplayName("Should get user domain")
    void testGetUserDomain() {
        // Given
        String domain = "TESTDOMAIN";
        when(mockCredentials.getUserDomain()).thenReturn(domain);

        // When
        String result = mockCredentials.getUserDomain();