Merge branch 'master' of https://github.com/eugenp/tutorials

core-java-modules/core-java-date-operations-2/README.md

@@ -8,4 +8,5 @@ This module contains articles about date operations in Java.
 - [Converting Java Date to OffsetDateTime](https://www.baeldung.com/java-convert-date-to-offsetdatetime)
 - [How to Set the JVM Time Zone](https://www.baeldung.com/java-jvm-time-zone)
 - [How to determine day of week by passing specific date in Java?](https://www.baeldung.com/java-get-day-of-week)
+- [Finding Leap Years in Java](https://www.baeldung.com/java-leap-year)
 - [[<-- Prev]](/core-java-modules/core-java-date-operations-1)

core-java-modules/core-java-date-operations-2/src/test/java/com/baeldung/leapyear/LeapYearUnitTest.java

@@ -0,0 +1,41 @@
+package com.baeldung.leapyear;
+
+import java.time.LocalDate;
+import java.time.Year;
+import java.time.format.DateTimeFormatter;
+import java.util.GregorianCalendar;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class LeapYearUnitTest {
+	
+	//Before Java8
+	@Test
+	public void testLeapYearUsingGregorianCalendar () {
+		Assert.assertFalse(new GregorianCalendar().isLeapYear(2018));
+	}
+	
+	//Java 8 and above
+	@Test
+	public void testLeapYearUsingJavaTimeYear () {
+		Assert.assertTrue(Year.isLeap(2012));
+	}
+	
+	@Test
+	public void testBCYearUsingJavaTimeYear () {
+		Assert.assertTrue(Year.isLeap(-4));
+	}
+	
+	@Test
+	public void testWrongLeapYearUsingJavaTimeYear () {
+		Assert.assertFalse(Year.isLeap(2018));
+	}
+	
+	@Test
+	public void testLeapYearInDateUsingJavaTimeYear () {
+		LocalDate date = LocalDate.parse("2020-01-05", DateTimeFormatter.ISO_LOCAL_DATE);
+		Assert.assertTrue(Year.from(date).isLeap());
+	}
+	
+}