Create a test directory to test ToDo and DateAndTime classes using JUnit

The ToDoTest class tests the toString and isDone methods, while the
DateAndTimeTest class tests the dayParser and isValidDate methods.

Author: proto-aiken-13

src/test/java/duke/DateAndTimeTest.java

@@ -0,0 +1,40 @@
+package duke;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Test cases for the {@link DateAndTime} class.
+ */
+public class DateAndTimeTest {
+
+    /**
+     * Test the {@link DateAndTime#isValidDate()} method.
+     */
+    @Test
+    public void validTest() {
+        DateAndTime test1 = new DateAndTime();
+        assertTrue(test1.isValidDate("2023-04-01", "2023-04-02"));
+    }
+
+    /**
+     * Test the {@link DateAndTime#dayParse()} method.
+     */
+    @Test
+    public void dateStringTest() {
+        DateAndTime test2 = new DateAndTime();
+        assertEquals("APRIL 1, 2023", test2.dayParse("2023-04-01"));
+    }
+
+    /**
+     * Test the {@link DateAndTime#dayParse()} method.
+     */
+    @Test
+    public void dateTimeStringTest() {
+        DateAndTime test3 = new DateAndTime();
+        assertEquals("APRIL 3, 2023, 18:00", test3.dayParse("2023-04-03", "18:00"));
+    }
+}

src/test/java/duke/ToDoTest.java

@@ -0,0 +1,41 @@
+package duke;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Test cases for the {@link ToDo} class.
+ */
+public class ToDoTest {
+
+    /**
+     * Test the {@link ToDo#toString()} method.
+     */
+    @Test
+    public void toStringTest() {
+        ToDo test1 = new ToDo("test");
+        assertEquals(test1.toString(), "[T][ ] test");
+    }
+
+    /**
+     * Test the {@link ToDo#isDone()} method.
+     */
+    @Test
+    public void doneTest() {
+        ToDo test2 = new ToDo("test");
+        test2.done();
+        assertTrue(test2.isDone());
+    }
+
+    /**
+     * Test the {@link ToDo#isDone()} method.
+     */
+    @Test
+    public void unDoneTest() {
+        ToDo test3 = new ToDo("test");
+        assertFalse(test3.isDone());
+    }
+}