Added two tests for time difference calculation in terms of seconds!

Author: alimate

java-dates/src/test/java/com/baeldung/date/DateDiffUnitTest.java

@@ -8,6 +8,7 @@
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.Period;
+import java.time.temporal.ChronoUnit;
 import java.util.Date;
 import java.util.Locale;
 import java.util.TimeZone;
@@ -51,6 +52,16 @@ public void givenTwoDateTimesInJava8_whenDifferentiating_thenWeGetSix() {
         assertEquals(diff, 6);
     }
 
+    @Test
+    public void givenTwoDateTimesInJava8_whenDifferentiatingInSeconds_thenWeGetTen() {
+        LocalDateTime now = LocalDateTime.now();
+        LocalDateTime tenSecondsLater = now.plusSeconds(10);
+
+        long diff = ChronoUnit.SECONDS.between(now, tenSecondsLater);
+
+        assertEquals(diff, 10);
+    }
+
     @Test
     public void givenTwoZonedDateTimesInJava8_whenDifferentiating_thenWeGetSix() {
         LocalDateTime ldt = LocalDateTime.now();
@@ -60,6 +71,16 @@ public void givenTwoZonedDateTimesInJava8_whenDifferentiating_thenWeGetSix() {
         assertEquals(diff, 6);
     }
 
+    @Test
+    public void givenTwoDateTimesInJava8_whenDifferentiatingInSecondsUsingUntil_thenWeGetTen() {
+        LocalDateTime now = LocalDateTime.now();
+        LocalDateTime tenSecondsLater = now.plusSeconds(10);
+
+        long diff = now.until(tenSecondsLater, ChronoUnit.SECONDS);
+
+        assertEquals(diff, 10);
+    }
+
     @Test
     public void givenTwoDatesInJodaTime_whenDifferentiating_thenWeGetSix() {
         org.joda.time.LocalDate now = org.joda.time.LocalDate.now();