Add JUnit test cases

test/java/DukeTest.java

@@ -0,0 +1,35 @@
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class DukeTest {
+    @Test
+    public void taskList_addTask() {
+        TaskList list = new TaskList();
+        list.addTask(new ToDos("placeholder", false));
+        list.addTask(new Events("birthday", "12-12-2020 1200", true));
+        assertEquals(list.size(), 2);
+        assertEquals(list.getTask(1).toString(), "[T][✗]placeholder");
+    }
+
+    @Test
+    public void taskList_addTask_deleteTask() {
+        TaskList list = new TaskList();
+        list.addTask(new ToDos("do homework", false));
+        list.addTask(new Deadline("CS2103 project", "26-08-2020 2359", false));
+        list.addTask(new Events("Friend Outing", "27-08-2020 2000", false));
+        list.deleteTask(3);
+        assertEquals(list.size(), 2);
+        assertEquals(list.getTask(2).toString(), "[D][✗]CS2103 project (by: 26-08-2020 2359)");
+    }
+
+    @Test
+    public void taskList_addTask_saveString() {
+        TaskList list = new TaskList();
+        list.addTask(new ToDos("do homework", false));
+        list.addTask(new Deadline("CS2103 project", "26-08-2020 2359", false));
+        list.addTask(new Events("Friend Outing", "27-08-2020 2000", false));
+        assertEquals(list.size(), 3);
+        assertEquals(list.getTask(3).toSaveString(), "E | 0 | Friend Outing | 27-08-2020 2000");
+    }
+}