// 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.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;

        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 {

        // 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");

import java.io.IOException;
import java.io.InputStream;
import java.util.Random;
import org.jspecify.annotations.NullUnmarked;

/**
 * A byte source for testing that has configurable behavior.
 *
 * @author Colin Decker
 */
@NullUnmarked
public final class TestByteSource extends ByteSource implements TestStreamSupplier {

  private final byte[] bytes;
  private final ImmutableSet<TestOption> options;

import java.io.IOException;
import java.io.InputStream;
import java.util.Random;
import org.jspecify.annotations.NullUnmarked;

/**
 * A byte source for testing that has configurable behavior.
 *
 * @author Colin Decker
 */
@NullUnmarked
public final class TestByteSource extends ByteSource implements TestStreamSupplier {

  private final byte[] bytes;
  private final ImmutableSet<TestOption> options;

 * character encoding} using {@link ByteSink#asCharSink(Charset)}. Characters written to the
 * resulting {@code CharSink} will written to the {@code ByteSink} as encoded bytes.
 *
 * @since 14.0
 * @author Colin Decker
 */
@J2ktIncompatible
@GwtIncompatible
public abstract class CharSink {

  /** Constructor for use by subclasses. */
  protected CharSink() {}

  /**

 * methods use {@link URL} parameters, they are usually not appropriate for HTTP or other
 * non-classpath resources.
 *
 * @author Chris Nokleberg
 * @author Ben Yu
 * @author Colin Decker
 * @since 1.0
 */
@J2ktIncompatible
@GwtIncompatible
public final class Resources {
  private Resources() {}

  /**
   * Returns a {@link ByteSource} that reads from the given URL.
   *

import java.util.Objects;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

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

  private TestSuppressor suppressor;

  @Override
  protected void setUp() throws Exception {
    suppressor = new TestSuppressor();
  }

 * Generates tests of all methods on a {@code ByteSink} given various inputs written to it as well
 * as sub-suites for testing the {@code CharSink} view in the same way.
 *
 * @author Colin Decker
 */
@AndroidIncompatible // TODO(b/230620681): Make this available (even though we won't run it).
@NullUnmarked
public class ByteSinkTester extends SourceSinkTester<ByteSink, byte[], ByteSinkFactory> {