final Tokenizer tokenizer = new Tokenizer("");
        assertThat(tokenizer.nextToken(), is(Tokenizer.TT_EOF));
        assertThat(tokenizer.nextToken(), is(Tokenizer.TT_EOF));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testWhitespace() throws Exception {
        final Tokenizer tokenizer = new Tokenizer("\t       \n");

  public void testEqualsSameContents() {
    new EqualsTester()
        .addEqualityGroup(
            getMultiset(), getSubjectGenerator().create(getSampleElements().toArray()))
        .testEquals();
  }

  @CollectionSize.Require(absent = ZERO)
  public void testNotEqualsEmpty() {
    new EqualsTester()
        .addEqualityGroup(getMultiset())

        GroupCQ cq = new GroupCQ();
        if (queryLambda != null) {
            queryLambda.callback(cq);
        }
        FilterAggregationBuilder builder = regFilterA(name, cq.getQuery());
        if (opLambda != null) {
            opLambda.callback(builder);
        }
        if (aggsLambda != null) {
            GroupCA ca = new GroupCA();
            aggsLambda.callback(ca);

### Properties in entirely new classes

When developing an entirely new class (task, extension, domain object, etc), the API should consist of managed lazy properties.

Preferably, these new classes should be 100% managed and have their implementation generated by Gradle at runtime.

        }

        @Test
        @DisplayName("Null tree handle triggers NullPointerException")
        void ctor_nullTree_throwsNPE() {
            // Arrange
            when(handle.getPipe()).thenReturn(pipe);

            // Act + Assert
            assertThrows(NullPointerException.class, () -> new SmbPipeOutputStream(handle, null));
        }

    public <E> Interner<E> build() {
      if (!strong) {
        mapMaker.weakKeys();
      }
      return new InternerImpl<>(mapMaker);
    }
  }

  /** Returns a fresh {@link InternerBuilder} instance. */
  public static InternerBuilder newBuilder() {
    return new InternerBuilder();
  }

  /**
   * Returns a new thread-safe interner which retains a strong reference to each instance it has

    @Override
    public void visit(TokenVisitor visitor) {
        lexer.visit(new VisitorImpl(visitor));
    }

    private class VisitorImpl extends TokenVisitor {
        private final TokenVisitor visitor;
        private final LinkedList<String> elementStack = new LinkedList<String>();
        private final Map<String, String> attributes = new HashMap<String, String>();

        public VisitorImpl(TokenVisitor visitor) {

    ImmutableList.Builder<List<E>> axesBuilder = new ImmutableList.Builder<>(lists.size());
    for (List<? extends E> list : lists) {
      List<E> copy = ImmutableList.copyOf(list);
      if (copy.isEmpty()) {
        return ImmutableList.of();
      }
      axesBuilder.add(copy);
    }
    return new CartesianList<>(axesBuilder.build());
  }

  CartesianList(ImmutableList<List<E>> axes) {

    TestQueue<String> inner = new TestQueue<>();
    Queue<String> outer = Synchronized.queue(inner, inner.mutex);
    outer.add("foo"); // necessary because we try to remove elements later on
    return outer;
  }

  private static final class TestQueue<E> implements Queue<E> {
    private final Queue<E> delegate = new LinkedList<>();
    private final Object mutex = new Object[0]; // something Serializable

    @Override

  @Nullable Integer expectedEdgeCount = null;

  /** Creates a new instance with the specified edge directionality. */
  private NetworkBuilder(boolean directed) {
    super(directed);
  }

  /** Returns a {@link NetworkBuilder} for building directed networks. */
  public static NetworkBuilder<Object, Object> directed() {
    return new NetworkBuilder<>(true);
  }