assertThrows(
        IllegalArgumentException.class,
        () -> inducedSubgraph(undirectedGraph, ImmutableSet.of(N1)));
  }

  @Test
  public void copyOf_nullArgument() {
    assertThrows(NullPointerException.class, () -> copyOf((Graph<?>) null));
  }

  @Test
  public void copyOf_directedGraph() {
    Graph<Integer> directedGraph = buildDirectedGraph();

    Graph<Integer> copy = copyOf(directedGraph);

 * converted to strings using {@link Object#toString()} before being appended.
 *
 * <p>If neither {@link #skipNulls()} nor {@link #useForNull(String)} is specified, the joining
 * methods will throw {@link NullPointerException} if any given element is null.
 *
 * <p><b>Warning: joiner instances are always immutable</b>; a configuration method such as {@code

   * returns a new {@code InternetDomainName} with the value {@code www.bar.foo.com}. Only lenient
   * validation is performed, as described {@link #from(String) here}.
   *
   * @throws NullPointerException if leftParts is null
   * @throws IllegalArgumentException if the resulting name is not valid
   */
  public InternetDomainName child(String leftParts) {
    return from(checkNotNull(leftParts) + "." + name);
  }

    Predicate<Class<?>> isInteger = Predicates.subtypeOf(Integer.class);

    assertTrue(isInteger.apply(Integer.class));
    assertFalse(isInteger.apply(Float.class));

    assertThrows(NullPointerException.class, () -> isInteger.apply(null));
  }

  @J2ktIncompatible
  @GwtIncompatible // Predicates.subtypeOf
  public void testSubtypeOf_subclass() {

 */
@NullMarked
@GwtCompatible
public class SplitterTest extends TestCase {

  private static final Splitter COMMA_SPLITTER = Splitter.on(',');

  public void testSplitNullString() {
    assertThrows(NullPointerException.class, () -> COMMA_SPLITTER.split(null));
  }

  public void testCharacterSimpleSplit() {
    String simple = "a,b,c";
    Iterable<String> letters = COMMA_SPLITTER.split(simple);

   *
   * <ul>
   *   <li>All non-private static methods are checked such that passing null for any parameter
   *       that's not annotated nullable should throw {@link NullPointerException}.
   *   <li>If there is any non-private constructor or non-private static factory method declared by
   *       {@code cls}, all non-private instance methods will be checked too using the instance

        }
      }
    }
  }

  public void testToArray_withNull() {
    List<@Nullable Short> list = Arrays.asList((short) 0, (short) 1, null);
    assertThrows(NullPointerException.class, () -> Shorts.toArray(list));
  }

  public void testToArray_withConversion() {
    short[] array = {(short) 0, (short) 1, (short) 2};

   * stream.
   *
   * <p>A caller can detect EOF if the number of bytes read is less than {@code len}. All subsequent
   * calls on the same stream will return zero.
   *
   * <p>If {@code b} is null, a {@code NullPointerException} is thrown. If {@code off} is negative,
   * or {@code len} is negative, or {@code off+len} is greater than the length of the array {@code

  }

  public void testConcatNullPointerException() {
    List<Integer> list1 = newArrayList(1);
    List<Integer> list2 = newArrayList(4);

    assertThrows(NullPointerException.class, () -> Iterables.concat(list1, null, list2));
  }

  public void testConcatPeformingFiniteCycle() {
    Iterable<Integer> iterable = asList(1, 2, 3);
    int n = 4;

  }

  public void testConcatNullPointerException() {
    List<Integer> list1 = newArrayList(1);
    List<Integer> list2 = newArrayList(4);

    assertThrows(NullPointerException.class, () -> Iterables.concat(list1, null, list2));
  }

  public void testConcatPeformingFiniteCycle() {
    Iterable<Integer> iterable = asList(1, 2, 3);
    int n = 4;