@ElementTypesAreNonnullByDefault
public class SetOperationsTest extends TestCase {
  @J2ktIncompatible
  @GwtIncompatible // suite
  public static Test suite() {
    TestSuite suite = new TestSuite();

    suite.addTest(
        SetTestSuiteBuilder.using(
                new TestStringSetGenerator() {
                  @Override
                  protected Set<String> create(String[] elements) {

    @Override
    public String[] createKeyArray(int length) {
      return new String[length];
    }

    @Override
    public String[] createValueArray(int length) {
      return new String[length];
    }

    @Override
    public SampleElements<String> sampleKeys() {
      return new SampleElements<>("one", "two", "three", "four", "five");
    }

    @Override

  public void run() throws Exception {
    File socketFile = new File("/tmp/ClientAndServer.sock");
    socketFile.delete(); // Clean up from previous runs.

    MockWebServer server = new MockWebServer();
    server.setServerSocketFactory(new UnixDomainServerSocketFactory(socketFile));
    server.setProtocols(Collections.singletonList(Protocol.H2_PRIOR_KNOWLEDGE));
    server.enqueue(new MockResponse().setBody("hello"));
    server.start();

    }

    @Test
    void testEqualsNullSafe() {
        assertNotEquals(null, new Model());

        new Model().equals(new Model());
    }

    @Test
    void testEqualsIdentity() {
        Model thing = new Model();
        assertEquals(thing, thing);
    }

    @Test
    void testToStringNullSafe() {
        assertNotNull(new Model().toString());
    }

  );
```

### Add suggest document

```java
String[][] readings = new String[2][];
readings[0] = new String[] { "kensaku", "fuga" };
readings[1] = new String[] { "enjin", "fuga" };
String[] tags = new String[] { "tag1", "tag2" };
String[] roles = new String[] { "role1", "role2", "role3" };
suggester.indexer().index(new SuggestItem(new String[] { "検索", "エンジン" }, readings, 1, tags, roles, SuggestItem.Kind.DOCUMENT));
```

        switch (previous) {
          case NEW:
            snapshot = new StateSnapshot(TERMINATED);
            enqueueTerminatedEvent(NEW);
            break;
          case STARTING:
            snapshot = new StateSnapshot(STARTING, true, null);
            enqueueStoppingEvent(STARTING);
            doCancelStart();
            break;
          case RUNNING:
            snapshot = new StateSnapshot(STOPPING);

    public void test_generateId_virtualHost() {
        final Map<String, Object> dataMap = new HashMap<String, Object>();
        dataMap.put("url", "http://example.com/");
        final List<String> roleTypeList = new ArrayList<String>();
        roleTypeList.add("admin");
        dataMap.put("role", roleTypeList);
        final List<String> virtualHostList = new ArrayList<String>();
        virtualHostList.add("site1");

        final File contentFile = createContentFile(".txt", content.getBytes());

        final CommandExtractor extractor = new CommandExtractor();
        extractor.command = getCommand(scriptFile);
        final Map<String, String> params = new HashMap<String, String>();
        final ExtractData text = extractor.getText(new FileInputStream(contentFile), params);
        assertEquals(content, text.getContent());
    }

    @Test
    void testHashCodeNullSafe() {
        new DependencyManagement().hashCode();
    }

    @Test
    void testEqualsNullSafe() {
        assertFalse(new DependencyManagement().equals(null));

        new DependencyManagement().equals(new DependencyManagement());
    }

    @Test
    void testEqualsIdentity() {
        DependencyManagement thing = new DependencyManagement();
        assertTrue(thing.equals(thing));

        throw new RuntimeException("Wrong length: " + x);
      }
    }
  }

  private static String oldRepeat(String string, int count) {
    // If this multiplication overflows, a NegativeArraySizeException or
    // OutOfMemoryError is not far behind
    final int len = string.length();
    final int size = len * count;
    char[] array = new char[size];
    for (int i = 0; i < size; i += len) {