import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.doNothing;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.lenient;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

    @ParameterizedTest
    @DisplayName("getSmbTree invalid inputs (null/empty) throw IllegalArgumentException")
    @CsvSource({ ",service", // null share
            " ,service", // empty share
            "share,", // null service
            "share, " // empty service
    })
    void getSmbTree_invalid(String share, String service) {

        // Close and verify subsequent calls throw
        handle.close();
        CIFSException ex1 = assertThrows(CIFSException.class, handle::getInput, "getInput after close must throw");
        assertTrue(ex1.getMessage().contains("Already closed"));
        CIFSException ex2 = assertThrows(CIFSException.class, handle::getOutput, "getOutput after close must throw");
        assertTrue(ex2.getMessage().contains("Already closed"));

            // Make TYPE_FILESYSTEM path, not named pipe
            when(mockFile.getType()).thenReturn(SmbConstants.TYPE_FILESYSTEM);

            // Capture the ReadAndX request; throw to short-circuit network
            doAnswer(inv -> {
                throw new SmbException("short-circuit");
            }).when(mockTree)
                    .send(any(jcifs.internal.CommonServerMessageBlockRequest.class),

import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.lenient;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import org.junit.jupiter.api.BeforeEach;

            doThrow(new NullPointerException("dest argument is null")).when(mockResource).renameTo(null);

            // When/Then
            assertThrows(NullPointerException.class, () -> mockResource.renameTo(null),
                    "Should throw NullPointerException for null destination");
        }
    }

    @Nested
    @DisplayName("Stream Operations Tests")
    class StreamOperationsTests {

        @Test

    public void testExceptionHandling() throws Exception {
        SmbSessionImpl session = new SmbSessionImpl(mockContext, "testhost", "testdomain", mockTransport);

        // Configure transport to throw exception on release
        Mockito.doThrow(new RuntimeException("Test exception")).when(mockTransport).release();

        session.acquire();

        // Should handle exceptions gracefully

            assertNull(unwrapped);
        }
    }

    @Nested
    @DisplayName("Exception handling tests")
    class ExceptionHandlingTests {

        @Test
        @DisplayName("doEnum rethrows CIFSException when not UnknownHostException")
        void doEnum_rethrowsCIFSException_whenNotUnknownHost() throws Exception {
            // Arrange
            SmbFile parent = mock(SmbFile.class, RETURNS_DEEP_STUBS);

        .build()
    clientCert =
      HeldCertificate
        .Builder()
        .signedBy(clientIntermediateCa)
        .serialNumber(4L)
        .commonName("Jethro Willis")
        .addSubjectAlternativeName("jethrowillis.com")
        .build()
  }

  @Test
  fun clientAuthForWants() {
    val client = buildClient(clientCert, clientIntermediateCa.certificate)

      }

      int rlen = r.length;
      int charsSkipped = index - lastEscape;

      // This is the size needed to add the replacement, not the full size
      // needed by the string. We only regrow when we absolutely must, and
      // when we do grow, grow enough to avoid excessive growing. Grow.
      int sizeNeeded = destIndex + charsSkipped + rlen;
      if (destSize < sizeNeeded) {