assertArrayEquals(new byte[0], session.getSessionKey());
        assertNull(session.getSessionKey());
        verify(session, times(3)).getSessionKey();
    }

    // Error propagation: getSessionKey throws CIFSException
    @Test
    @DisplayName("getSessionKey throws CIFSException on failure")
    void getSessionKey_throws() throws CIFSException {

import static org.junit.Assert.assertTrue;

import java.io.IOException;

import org.junit.Test;

/**
 * Test class for CurlException.
 * Tests exception creation, message handling, and cause propagation.
 */
public class CurlExceptionTest {

    @Test
    public void testConstructorWithMessage() {
        String message = "Test error message";
        CurlException exception = new CurlException(message);

    }

    /**
     * Verify that root causes are stored and returned correctly.
     */
    @Test
    @DisplayName("Root cause propagation")
    void testRootCausePropagation() {
        Throwable root = mock(Throwable.class);
        SmbException ex = new SmbException(0, root);
        assertSame(root, ex.getRootCause());
    }

    /**

    void causeOnlyConstructor_preservesCause_andNoInteractions() {
        // Arrange & Act
        SMBProtocolDecodingException ex = new SMBProtocolDecodingException(mockCause);

        // Assert cause propagation
        assertSame(mockCause, ex.getCause(), "Cause should be exactly the provided instance");

        // Access common Throwable methods to exercise paths without touching the cause