typeToken == supertypeToken,
          supertypeToken.isSupertypeOf(typeToken));
    }
  }

  public <N1 extends Number, N2 extends Number, N11 extends N1>
      void testisSupertypeOf_typeVariable() {
    assertAssignable(
        TypeToken.of(new TypeCapture<N1>() {}.capture()),
        TypeToken.of(new TypeCapture<N1>() {}.capture()));