import org.junit.Test;

import java.time.Duration;

import static org.junit.Assert.*;
import static org.hamcrest.CoreMatchers.*;

public class Main {

    @Test
    public void test1(){
        System.out.println("Current JVM version - " + System. getProperty("java.version"));
        Duration duration = Duration.ofNanos(670000023);
        System.out.println(duration);

        assertThat(duration.toSecondsPart(),is(0));
    }

    @Test
    public void test2(){
        System.out.println("Current JVM version - " + System. getProperty("java.version"));
        Duration duration = Duration.ofNanos(670000023);
        System.out.println(duration);
        assertThat(duration.negated().toSecondsPart(),is(0));
    }
}