spring-soap/java-dates-string/src/test/java/com/baeldung/zonedatetime/ZoneDateTimeExampleUnitTest.java

package com.baeldung.zonedatetime;

import static org.junit.Assert.assertTrue;

import java.time.ZoneId;
import java.time.ZonedDateTime;

import org.junit.Test;

public class ZoneDateTimeExampleUnitTest {

    ZoneDateTimeExample zoneDateTimeExample = new ZoneDateTimeExample();

    @Test
    public void givenZone_whenGetCurrentTime_thenResultHasZone() {
        String zone = "Europe/Berlin";
        ZonedDateTime time = zoneDateTimeExample.getCurrentTimeByZoneId(zone);

        assertTrue(time.getZone()
            .equals(ZoneId.of(zone)));
    }

    @Test
    public void givenZones_whenConvertDateByZone_thenGetConstantDiff() {
        String sourceZone = "Europe/Berlin";
        String destZone = "Asia/Tokyo";
        ZonedDateTime sourceDate = zoneDateTimeExample.getCurrentTimeByZoneId(sourceZone);
        ZonedDateTime destDate = zoneDateTimeExample.convertZonedDateTime(sourceDate, destZone);
        
        assertTrue(sourceDate.toInstant()
            .compareTo(destDate.toInstant()) == 0);
    }
}