Switch from Postgres to H2

java-dates/src/test/java/com/baeldung/dateapi/JavaPeriodUnitTest.java

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+package com.baeldung.dateapi;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+import java.time.LocalDate;
+import java.time.Period;
+import java.time.temporal.ChronoUnit;
+
+import org.apache.log4j.Logger;
+import org.junit.Test;
+
+public class JavaPeriodUnitTest {
+
+    private static final Logger LOG = Logger.getLogger(JavaPeriodUnitTest.class);
+
+    @Test
+    public void givenADatePlus5Days_whenRequestingPeriod_thenExpectFive() {
+        LocalDate initialDate = LocalDate.parse("2007-05-10");
+        LocalDate finalDate = initialDate.plus(Period.ofDays(5));
+
+        int days = Period.between(initialDate, finalDate)
+            .getDays();
+
+        assertThat(days).isEqualTo(5);
+    }
+
+    @Test
+    public void givenADatePlus5Days_whenRequestingDaysBetween_thenExpectFive() {
+        LocalDate initialDate = LocalDate.parse("2007-05-10");
+        LocalDate finalDate = initialDate.plus(Period.ofDays(5));
+
+        long days = ChronoUnit.DAYS.between(initialDate, finalDate);
+
+        assertThat(days).isEqualTo(5);
+    }
+
+    @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(String.format("Years:%d months:%d days:%d", period.getYears(), period.getMonths(), 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());
+    }
+
+}