// When
        byte[] decKey = Smb3KeyDerivation.deriveDecryptionKey(dialect, sessionKey, preauthIntegrity);

        // Then
        assertNotNull(decKey, "Decryption key should not be null");
        assertEquals(16, decKey.length, "Decryption key should be 16 bytes");
        assertFalse(Arrays.equals(sessionKey, decKey), "Decryption key should be different from session key");
    }

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import org.jspecify.annotations.NullUnmarked;

/**
 * A char source for testing that has configurable options.
 *
 * @author Colin Decker
 */
@NullUnmarked
public class TestCharSource extends CharSource implements TestStreamSupplier {

  private final TestByteSource byteSource;

  public TestCharSource(String content, TestOption... options) {

import java.util.concurrent.TimeUnit;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Tests for {@link AbstractListeningExecutorService}.
 *
 * @author Colin Decker
 */
@NullUnmarked
public class AbstractListeningExecutorServiceTest extends TestCase {

  public void testSubmit() throws Exception {
    /*

import java.io.IOException;
import java.io.OutputStream;
import org.jspecify.annotations.NullUnmarked;

/**
 * A byte sink for testing that has configurable behavior.
 *
 * @author Colin Decker
 */
@NullUnmarked
public class TestByteSink extends ByteSink implements TestStreamSupplier {

  private final ByteArrayOutputStream bytes = new ByteArrayOutputStream();
  private final ImmutableSet<TestOption> options;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import org.jspecify.annotations.NullUnmarked;

/**
 * A char sink for testing that has configurable behavior.
 *
 * @author Colin Decker
 */
@NullUnmarked
public class TestCharSink extends CharSink implements TestStreamSupplier {

  private final TestByteSink byteSink;

  public TestCharSink(TestOption... options) {

        try {
            int expectedKeyLength = getKeyLength();
            byte[] encKey = getEncryptionKey();
            byte[] decKey = getDecryptionKey();

            try {
                boolean valid =
                        encKey != null && encKey.length == expectedKeyLength && decKey != null && decKey.length == expectedKeyLength;
                return valid;
            } finally {

 */

package com.google.common.io;

import org.jspecify.annotations.NullUnmarked;

/**
 * Options controlling the behavior of sources/sinks/streams for testing.
 *
 * @author Colin Decker
 */
@NullUnmarked
public enum TestOption {
  OPEN_THROWS,
  SKIP_THROWS,
  READ_THROWS,
  WRITE_THROWS,
  CLOSE_THROWS,
  AVAILABLE_ALWAYS_ZERO

 */

package com.google.common.io;

import org.jspecify.annotations.NullUnmarked;

/**
 * Options controlling the behavior of sources/sinks/streams for testing.
 *
 * @author Colin Decker
 */
@NullUnmarked
public enum TestOption {
  OPEN_THROWS,
  SKIP_THROWS,
  READ_THROWS,
  WRITE_THROWS,
  CLOSE_THROWS,
  AVAILABLE_ALWAYS_ZERO

import com.google.common.annotations.J2ktIncompatible;

/**
 * Modes for opening a file for writing. The default when mode when none is specified is to truncate
 * the file before writing.
 *
 * @author Colin Decker
 */
@J2ktIncompatible
@GwtIncompatible
public enum FileWriteMode {
  /** Specifies that writes to the opened file should append to the end of the file. */
  APPEND

        // Given
        byte[] encKey = new byte[16];
        byte[] decKey = new byte[16];
        new SecureRandom().nextBytes(encKey);
        new SecureRandom().nextBytes(decKey);

        // When using try-with-resources
        assertDoesNotThrow(() -> {
            try (Smb2EncryptionContext context = new Smb2EncryptionContext(1, DialectVersion.SMB311, encKey, decKey)) {
                assertNotNull(context, "Context should be created");