}

  public void testMethod_notDeclaredByType() throws NoSuchMethodException {
    Method sizeMethod = Map.class.getMethod("size");
    assertThrows(IllegalArgumentException.class, () -> TypeToken.of(List.class).method(sizeMethod));
  }

  public void testMethod_declaredBySuperclass() throws Exception {
    Method toStringMethod = Object.class.getMethod("toString");

  }

  public void testMethod_notDeclaredByType() throws NoSuchMethodException {
    Method sizeMethod = Map.class.getMethod("size");
    assertThrows(IllegalArgumentException.class, () -> TypeToken.of(List.class).method(sizeMethod));
  }

  public void testMethod_declaredBySuperclass() throws Exception {
    Method toStringMethod = Object.class.getMethod("toString");

    }
  }

  public void testToStringImplWithNullKeys() throws Exception {
    Map<@Nullable String, String> hashmap = Maps.newHashMap();
    hashmap.put("foo", "bar");
    hashmap.put(null, "baz");

    assertEquals(hashmap.toString(), Maps.toStringImpl(hashmap));
  }

  public void testToStringImplWithNullValues() throws Exception {
    Map<String, @Nullable String> hashmap = Maps.newHashMap();

    }
  }

  public void testToStringImplWithNullKeys() throws Exception {
    Map<@Nullable String, String> hashmap = Maps.newHashMap();
    hashmap.put("foo", "bar");
    hashmap.put(null, "baz");

    assertEquals(hashmap.toString(), Maps.toStringImpl(hashmap));
  }

  public void testToStringImplWithNullValues() throws Exception {
    Map<String, @Nullable String> hashmap = Maps.newHashMap();

   * are inclusive). For example, to match any lowercase letter of the English alphabet, use {@code
   * CharMatcher.inRange('a', 'z')}.
   *
   * @throws IllegalArgumentException if {@code endInclusive < startInclusive}
   */
  public static CharMatcher inRange(final char startInclusive, final char endInclusive) {
    return new InRange(startInclusive, endInclusive);
  }

   * are inclusive). For example, to match any lowercase letter of the English alphabet, use {@code
   * CharMatcher.inRange('a', 'z')}.
   *
   * @throws IllegalArgumentException if {@code endInclusive < startInclusive}
   */
  public static CharMatcher inRange(final char startInclusive, final char endInclusive) {
    return new InRange(startInclusive, endInclusive);
  }

    // following writeObject() handles the SynchronizedObject members.

    @GwtIncompatible // java.io.ObjectOutputStream
    @J2ktIncompatible
    private void writeObject(ObjectOutputStream stream) throws IOException {
      synchronized (mutex) {
        stream.defaultWriteObject();
      }
    }

    @GwtIncompatible // not needed in emulated source
    @J2ktIncompatible

REGISTER_OP("TestCommUnavailable")
    .Output("out: string")
    .SetIsDistributedCommunication()
    .Doc(R"doc(Test communication op throwing Unavailable error.)doc");

// Kernel that throws an Unavailable error.
class TestUnavailableErrorOp : public tensorflow::OpKernel {
 public:
  explicit TestUnavailableErrorOp(tensorflow::OpKernelConstruction* ctx)
      : tensorflow::OpKernel(ctx) {}