import java.util.Map;
import junit.framework.TestCase;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Tests for {@link Functions}.
 *
 * @author Mike Bostock
 * @author Vlad Patryshev
 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
public class FunctionsTest extends TestCase {

  public void testIdentity_same() {