found somewhere on stackoverflow

UnboxingEquals.java

package not.hub.test;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

class UnboxingEquals {

    @Test
    void sanity_check() {
        // noinspection NumberEquality,SimplifiableAssertion,SimplifiableAssertion
        Assertions.assertTrue((Integer.valueOf(42) == Integer.valueOf(42)) == (Integer.valueOf(420) == Integer.valueOf(420)));
    }

}