assertTrue(isNumber.apply(Integer.class));
    assertTrue(isNumber.apply(Float.class));
  }

  @J2ktIncompatible
  @GwtIncompatible // Predicates.subtypeOf
  public void testSubtypeOf_interface() {
    Predicate<Class<?>> isComparable = Predicates.subtypeOf(Comparable.class);

    assertTrue(isComparable.apply(Integer.class));
    assertTrue(isComparable.apply(Float.class));
  }