public void testNullBounds() {
    // NullBounds has methods whose parameters are type variables that have
    // "extends @Nullable Object" as a bound. This test ensures that NullPointerTester considers
    // those parameters to be @Nullable, so it won't call the methods.
    NullBounds<?, ?, ?> nullBounds = new NullBounds<>();
    new NullPointerTester().testAllPublicInstanceMethods(nullBounds);
    assertThat(nullBounds.xWasCalled).isTrue();