period and duration test (#1795)

core-java/src/test/java/com/baeldung/dateapi/JavaDurationTest.java

@@ -0,0 +1,42 @@
+package com.baeldung.dateapi;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+
+import org.junit.Test;
+
+public class JavaDurationTest {
+
+    @Test
+    public void test2() {
+        Instant start = Instant.parse("2017-10-03T10:15:30.00Z");
+        Instant end = Instant.parse("2017-10-03T10:16:30.00Z");
+
+        Duration duration = Duration.between(start, end);
+
+        assertFalse(duration.isNegative());
+
+        assertEquals(60, duration.getSeconds());
+        assertEquals(1, duration.toMinutes());
+
+        Duration fromDays = Duration.ofDays(1);
+        assertEquals(86400, fromDays.getSeconds());
+
+        Duration fromMinutes = Duration.ofMinutes(60);
+        assertEquals(1, fromMinutes.toHours());
+
+        assertEquals(120, duration.plusSeconds(60).getSeconds());
+        assertEquals(30, duration.minusSeconds(30).getSeconds());
+
+        assertEquals(120, duration.plus(60, ChronoUnit.SECONDS).getSeconds());
+        assertEquals(30, duration.minus(30, ChronoUnit.SECONDS).getSeconds());
+
+        Duration fromChar1 = Duration.parse("P1DT1H10M10.5S");
+        Duration fromChar2 = Duration.parse("PT10M");
+    }
+
+}

core-java/src/test/java/com/baeldung/dateapi/JavaPeriodTest.java

@@ -0,0 +1,42 @@
+package com.baeldung.dateapi;
+
+import java.time.LocalDate;
+import java.time.Period;
+
+import org.apache.log4j.Logger;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class JavaPeriodTest {
+
+    private static final Logger LOG = Logger.getLogger(JavaPeriodTest.class);
+
+    @Test
+    public void whenTestPeriod_thenOk() {
+
+        LocalDate startDate = LocalDate.of(2015, 2, 15);
+        LocalDate endDate = LocalDate.of(2017, 1, 21);
+
+        Period period = Period.between(startDate, endDate);
+
+        LOG.info("Years:" + period.getYears() + " months:" + period.getMonths() + " days:" + period.getDays());
+
+        assertFalse(period.isNegative());
+        assertEquals(56, period.plusDays(50).getDays());
+        assertEquals(9, period.minusMonths(2).getMonths());
+
+        Period fromUnits = Period.of(3, 10, 10);
+        Period fromDays = Period.ofDays(50);
+        Period fromMonths = Period.ofMonths(5);
+        Period fromYears = Period.ofYears(10);
+        Period fromWeeks = Period.ofWeeks(40);
+
+        assertEquals(280, fromWeeks.getDays());
+
+        Period fromCharYears = Period.parse("P2Y");
+        assertEquals(2, fromCharYears.getYears());
+        Period fromCharUnits = Period.parse("P2Y3M5D");
+        assertEquals(5, fromCharUnits.getDays());
+    }
+
+}