}

    @Test
    @DisplayName("unwrap returns this for compatible types and throws otherwise")
    void unwrapBehavior() {
        // Happy paths
        SmbTransport asIface = transport.unwrap(SmbTransport.class);
        assertSame(transport, asIface);
        SmbTransportInternal asInternal = transport.unwrap(SmbTransportInternal.class);
        assertSame(transport, asInternal);

    TreeBasedTable<String, Integer, Character> table = makeTable();
    populateTable(table);
    return table.rowMap().subMap("b", "x");
  }

  @Override
  protected Map<String, Map<Integer, Character>> makeEmptyMap() {
    return makeTable().rowMap().subMap("b", "x");
  }

  @Override
  protected String getKeyNotInPopulatedMap() {
    return "z";
  }

    /**
     * Unwraps the tree instance to the specified type
     * @param <T> the target tree type
     * @param type the class of the tree type to unwrap to
     * @return tree instance with the given type
     */
    <T extends SmbTree> T unwrap(Class<T> type);

    /**
     * {@inheritDoc}
     *
     * @see java.lang.AutoCloseable#close()
     */
    @Override
    void close();

 *
 * @author mbechler
 *
 */
public interface Address {

    /**
     * Unwrap the address to a specific type
     *
     * @param <T> the type to unwrap to
     * @param type the target type to unwrap to
     * @return instance for type, null if the type cannot be unwrapped
     */
    <T extends Address> T unwrap(Class<T> type);

    /**
     * Gets the host name of this address.
     *

    @Test
    void testUnwrap() {
        // Arrange
        SmbTransport mockUnwrappedTransport = smbTransport; // Mocking unwrap to return itself for simplicity
        when(smbTransport.unwrap(SmbTransport.class)).thenReturn(mockUnwrappedTransport);

        // Act
        SmbTransport result = smbTransport.unwrap(SmbTransport.class);

        // Assert
        assertNotNull(result, "Unwrapped transport should not be null");

  @Override
  public ImmutableMap<R, Map<C, V>> rowMap() {
    // Casts without copying.
    return ImmutableMap.copyOf(rowMap);
  }

  @Override
  public int size() {
    return cellRowIndices.length;
  }

  @Override
  Cell<R, C, V> getCell(int index) {
    int rowIndex = cellRowIndices[index];
    Entry<R, ImmutableMap<C, V>> rowEntry = rowMap.entrySet().asList().get(rowIndex);

            return "TESTDOMAIN"; // test domain for test purposes
        }

        @Override
        public <T extends Credentials> T unwrap(Class<T> type) {
            if (type.isInstance(this)) {
                return type.cast(this);
            }
            throw new ClassCastException("Cannot unwrap to " + type.getName());
        }
    }

    static class SelfRenewingCreds extends BaseCreds {
        @Override

	}
}

const unwrapErrsDepth = 3

// unwrapErrs upto the point where errors.Unwrap(err) returns nil
func unwrapErrs(err error) (leafErr error) {
	uerr := errors.Unwrap(err)
	depth := 1
	for uerr != nil {
		// Save the current `uerr`
		leafErr = uerr
		// continue to look for leaf errors underneath
		uerr = errors.Unwrap(leafErr)
		depth++
		if depth == unwrapErrsDepth {
			// If we have reached enough depth we

        }
    }

    @Nested
    @DisplayName("unwrap method tests")
    class UnwrapTests {

        private Address mockAddress;

        @BeforeEach
        void setup() {
            mockAddress = mock(Address.class);
        }

        @Test
        void shouldReturnUnwrappedAddressWhenWrappedIsAddress() {
            when(mockAddress.unwrap(Address.class)).thenReturn(mockAddress);

            address.toInetAddress();
            address.unwrap(Address.class);
        }, "All Address interface methods should be callable");
    }

    @Test
    @DisplayName("unwrap method should return correct type when supported")
    void testUnwrapMethodContract() throws Exception {
        // Given
        when(mockAddress.unwrap(Address.class)).thenReturn(mockAddress);

        // When & Then