add calc age test

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

@@ -0,0 +1,31 @@
+package com.baeldung.date;
+
+import static org.junit.Assert.assertEquals;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.time.LocalDate;
+import java.util.Date;
+import org.junit.jupiter.api.Test;
+
+public class AgeCalculatorUnitTest {
+    AgeCalculator ageCalculator = new AgeCalculator();
+
+    @Test
+    public void givenLocalDate_whenCalculateAge_thenOk() {
+        assertEquals(10, ageCalculator.calculateAge(LocalDate.of(2008, 5, 20), LocalDate.of(2018, 9, 20)));
+    }
+
+    @Test
+    public void givenJodaTime_whenCalculateAge_thenOk() {
+        assertEquals(10, ageCalculator.calculateAgeWithJodaTime(new org.joda.time.LocalDate(2008, 5, 20), new org.joda.time.LocalDate(2018, 9, 20)));
+    }
+
+    @Test
+    public void givenDate_whenCalculateAge_thenOk() throws ParseException {
+        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
+        Date birthDate = sdf.parse("2008-05-20");
+        Date currentDate = sdf.parse("2018-09-20");
+        assertEquals(10, ageCalculator.calculateAgeWithJava7(birthDate, currentDate));
+    }
+
+}