import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.Arrays;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link ByteStreams}.
 *
 * @author Chris Nokleberg
 */
@NullUnmarked
public class ByteStreamsTest extends IoTestCase {

  public void testCopyChannel() throws IOException {

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@link Bytes}.
 *
 * @author Kevin Bourrillion
 */
@NullMarked
@GwtCompatible
public class BytesTest extends TestCase {
  private static final byte[] EMPTY = {};

import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

/**
 * Unit tests for the {@link PluginUpgradeStrategy} class.
 * Tests plugin version upgrades, plugin management additions, and Maven 4 compatibility.
 */
@DisplayName("PluginUpgradeStrategy")
class PluginUpgradeStrategyTest {

	}{
		{s1, mkMPObj(s1)},
		{s2, mkMPObj(s2)},
		{s3, mkMPObj(s3)},
	}

	// This function is a reference (re-)implementation of
	// decrypted range computation, written solely for the purpose
	// of the unit tests.
	//
	// `s` gives the decrypted part sizes, and the other
	// parameters describe the desired read segment. When
	// `isFromEnd` is true, `skipLen` argument is ignored.

import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.Arrays;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link ByteStreams}.
 *
 * @author Chris Nokleberg
 */
@NullUnmarked
public class ByteStreamsTest extends IoTestCase {

  public void testCopyChannel() throws IOException {

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@link Bytes}.
 *
 * @author Kevin Bourrillion
 */
@NullMarked
@GwtCompatible
public class BytesTest extends TestCase {
  private static final byte[] EMPTY = {};

import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@link Range}.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@NullMarked
public class RangeTest extends TestCase {
  public void testOpen() {
    Range<Integer> range = Range.open(4, 8);

    }
    
    public int getLeaseVersion() {
        return getIntProperty(LEASE_VERSION, 2);  // Default to V2 if supported
    }
}
```

## 8. Testing Strategy

### 8.1 Unit Tests
```java
package jcifs.tests.smb3;

import org.junit.Test;
import static org.junit.Assert.*;

public class LeaseTest {
    
    @Test
    public void testLeaseKeyGeneration() {

import java.util.Arrays;
import java.util.List;
import junit.framework.AssertionFailedError;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@link Preconditions}.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 */
@NullMarked
@SuppressWarnings("LenientFormatStringValidation") // Intentional for testing
@GwtCompatible

import java.util.Arrays;
import java.util.List;
import junit.framework.AssertionFailedError;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@link Preconditions}.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 */
@NullMarked
@SuppressWarnings("LenientFormatStringValidation") // Intentional for testing
@GwtCompatible