Converting date/time retrieval methods to JUnits

core-java-8/src/test/java/com/baeldung/util/CurrentDateTimeTest.java

@@ -0,0 +1,47 @@
+package com.baeldung.util;
+
+import static org.junit.Assert.assertEquals;
+
+import java.time.Instant;
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.temporal.ChronoField;
+import java.util.Calendar;
+import java.util.GregorianCalendar;
+
+import org.junit.Test;
+
+public class CurrentDateTimeTest {
+
+    @Test
+    public void shouldReturnCurrentDate() {
+
+        final LocalDate now = LocalDate.now();
+        final Calendar calendar = GregorianCalendar.getInstance();
+
+        assertEquals("10-10-2010".length(), now.toString().length());
+        assertEquals(calendar.get(Calendar.DATE), now.get(ChronoField.DAY_OF_MONTH));
+        assertEquals(calendar.get(Calendar.MONTH), now.get(ChronoField.MONTH_OF_YEAR) - 1);
+        assertEquals(calendar.get(Calendar.YEAR), now.get(ChronoField.YEAR));
+    }
+
+    @Test
+    public void shouldReturnCurrentTime() {
+
+        final LocalTime now = LocalTime.now();
+        final Calendar calendar = GregorianCalendar.getInstance();
+
+        assertEquals(calendar.get(Calendar.HOUR_OF_DAY), now.get(ChronoField.HOUR_OF_DAY));
+        assertEquals(calendar.get(Calendar.MINUTE), now.get(ChronoField.MINUTE_OF_HOUR));
+        assertEquals(calendar.get(Calendar.SECOND), now.get(ChronoField.SECOND_OF_MINUTE));
+    }
+
+    @Test
+    public void shouldReturnCurrentTimestamp() {
+
+        final Instant now = Instant.now();
+        final Calendar calendar = GregorianCalendar.getInstance();
+
+        assertEquals(calendar.getTimeInMillis() / 1000, now.getEpochSecond());
+    }
+}