import java.util.concurrent.atomic.AtomicReference;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@link ArbitraryInstances}.
 *
 * @author Ben Yu
 */
@NullUnmarked
public class ArbitraryInstancesTest extends TestCase {

        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() {
        Smb2LeaseKey key1 = new Smb2LeaseKey();

import com.google.common.annotations.GwtCompatible;
import com.google.common.testing.EqualsTester;
import java.util.Collections;
import java.util.Comparator;
import java.util.Optional;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Tests for {@code Comparators}.
 *
 * @author Louis Wasserman
 */
@GwtCompatible
@NullMarked

import okio.Source
import okio.buffer
import okio.fakefilesystem.FakeFileSystem
import org.junit.jupiter.api.AfterEach
import org.junit.jupiter.api.Assumptions
import org.junit.jupiter.api.Tag
import org.junit.jupiter.api.Timeout
import org.junit.jupiter.api.io.TempDir
import org.junit.jupiter.params.ParameterizedTest
import org.junit.jupiter.params.provider.ArgumentsSource

class FileSystemParamProvider : SimpleProvider() {

import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullUnmarked;

/**
 * A generator of {@code TestSuite} instances for testing {@code CharSource} implementations.

import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * Base test case class for I/O tests.
 *
 * @author Chris Nokleberg
 * @author Colin Decker
 */

 */

package com.google.common.collect;

import java.util.ArrayDeque;
import java.util.Collection;
import java.util.Deque;
import java.util.Iterator;
import java.util.LinkedList;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * Tests for {@link Synchronized#deque} and {@link Queues#synchronizedDeque}.
 *

 * limitations under the License.
 */

package com.google.common.testing;

import static com.google.common.base.Preconditions.checkNotNull;
import static junit.framework.Assert.assertTrue;

import com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.ArrayList;
import java.util.Arrays;

import static com.google.common.collect.testing.SampleElements.Strings.BEFORE_FIRST_2;
import static java.lang.Math.max;
import static java.util.Arrays.asList;
import static java.util.Collections.sort;
import static junit.framework.Assert.assertEquals;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ContiguousSet;

import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicReference;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * @author Charles Fry
 */
@NullUnmarked
public class LocalLoadingCacheTest extends TestCase {