// Act: invoke renew()
        CredentialsInternal result = renewable.renew();

        // Assert: verify interaction and returned value
        verify(renewable, times(1)).renew();
        assertSame(returned, result, "renew() should return the stubbed value");

        // Negative interaction check: no further interactions with the mock
        verifyNoMoreInteractions(renewable);
    }

    @Test

     * verifying interaction.
     */
    private class RecordingFilter implements SmbFileFilter {
        private SmbFile lastFile;
        private String lastPath;

        @Override
        public boolean accept(SmbFile file) throws SmbException {
            lastFile = file;
            // Actually interact with the file to verify the mock interaction
            if (file != null) {

            assertSame(rp, Enum.valueOf(RequestParam.class, rp.name()));
        }
    }

    // Interaction: Demonstrate no external interactions occur (no collaborators to call)
    // We use Mockito in a minimal, meaningful way: pass the enum to a mocked consumer and verify interaction.
    interface EnumConsumer {
        void accept(RequestParam rp);
    }

    @Mock
    EnumConsumer consumer;

import jcifs.internal.Request;

/**
 * Tests for SmbTreeInternal interface behavior via mocks.
 * Since this is an interface, we validate its public API contract
 * through interaction testing and generic type usage.
 */
@ExtendWith(MockitoExtension.class)
class SmbTreeInternalTest {

    @Mock
    private SmbTreeInternal tree;

    @Mock
    private CIFSContext context;

    @Mock

    }

    // Simple collaborator to demonstrate interaction verification with Mockito
    interface Handler {
        void handle(int code, String message);
    }

    @Mock
    Handler handler;

    @Test
    @DisplayName("Interaction: handler called with each code/message pair")
    void interaction_with_mock_handler_is_as_expected() {
        // Interaction test: simulate passing each code/message to a collaborator

/**
 * Unit tests for {@link FileEntry}. The interface itself has no
 * implementation, so the tests exercise the contract via Mockito mocks.
 * Each method is exercised for normal inputs, extreme or edge cases, and
 * interaction verification.
 */
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;

        Supplier<String> supplier = mock(Supplier.class);
        when(supplier.get()).thenThrow(new RuntimeException(new SmbUnsupportedOperationException("boom")));

        // Act & Assert: the exception is propagated and interaction recorded once
        RuntimeException thrown = assertThrows(RuntimeException.class, supplier::get);
        assertInstanceOf(SmbUnsupportedOperationException.class, thrown.getCause());

            if (tc == null) {
                throw new NullPointerException("tc");
            }
            // Exercise interaction with dependency for verification purposes
            // These methods do not throw and allow interaction checks.
            tc.getConfig();
            tc.getCredentials();

            // Minimal behavior: return a mock SSPContext with lenient stubbing

        int apply(FileEntry e);
    }

    private interface LongGetter {
        long apply(FileEntry e);
    }

    // --- Mockito-based interaction tests ---

    @Test
    @DisplayName("Mocked FileEntry returns stubbed values and verifies interactions")
    void mockedEntry_happyPath_and_interactions() {
        // Arrange: stub all methods with representative values

        String out = locator.handleDFSReferral(referral, reqPath);
        assertEquals(resolved, out);

        // Verify exact argument interaction
        verify(locator, times(1)).handleDFSReferral(referral, reqPath);
        verifyNoMoreInteractions(locator);
    }

    // Edge / invalid: null referral or empty/blank path
    @Test