Add unit tests for LocalDate to ISO 8601

core-java-modules/core-java-8-datetime-2/src/test/java/com/baeldung/localdatetoiso/LocalDateToISOUnitTest.java

@@ -0,0 +1,28 @@
+package com.baeldung.localDateToISO;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import java.time.LocalDate;
+
+public class LocalDateToISOUnitTest {
+    @Test
+    public void givenLocalDate_whenUsingDateTimeFormatterThenISOFormat(){
+        LocalDateToISO localDateToISO = new LocalDateToISO();
+        LocalDate localDate = LocalDate.of(2023, 11, 6);
+
+        String expected = "2023-11-06T00:00:00Z";
+        String actual = localDateToISO.formatUsingDateTimeFormatter(localDate);
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void givenLocalDate_whenUsingSimpleDateFormatThenISOFormat(){
+        LocalDateToISO localDateToISO = new LocalDateToISO();
+        LocalDate localDate = LocalDate.of(2023, 11, 6);
+
+        String expected = "2023-11-06T00:00:00Z";
+        String actual = localDateToISO.formatUsingSimpleDateFormat(localDate);
+        assertEquals(expected, actual);
+    }
+}