Split the first 2 modules: java-dates-conversion and java-dates-string.

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

@@ -0,0 +1,33 @@
+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);
+    }
+}