Add JUnit tests to test behavior of the code

src/main/java/duke/task/Deadline.java

@@ -19,10 +19,10 @@ public Deadline(String description, LocalDate deadlineDate, LocalTime deadlineTi
     @Override
     public String TaskInfo() {
         if (deadlineTime == null) {
-            return "[D] [" + getStatusIcon() + "] " + description + "(by:" +
+            return "[D] [" + getStatusIcon() + "] " + description + " (by:" +
                     deadlineDate.format(DateTimeFormatter.ofPattern("MMM dd yyyy")) +")";
         } else {
-            return "[D] [" + getStatusIcon() + "] " + description + "(by:" +
+            return "[D] [" + getStatusIcon() + "] " + description + " (by:" +
                     deadlineDate.format(DateTimeFormatter.ofPattern("MMM dd yyyy")) + " " + deadlineTime +")";
         }
 

src/main/java/duke/task/Event.java

@@ -11,7 +11,7 @@ public Event(String description, String duration) {
 
     @Override
     public String TaskInfo() {
-        return "[E] [" + getStatusIcon() + "] " + description + "(at:" + duration + ")";
+        return "[E] [" + getStatusIcon() + "] " + description + " (at:" + duration + ")";
     }
 
     @Override

src/test/java/duke/DeadlineTest.java

@@ -0,0 +1,23 @@
+package duke;
+
+
+import duke.task.Deadline;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class DeadlineTest {
+
+    @Test
+    public void toDoDeadline() {
+        Deadline testDeadline = new Deadline("Return book",
+                LocalDate.parse("2022-08-25", DateTimeFormatter.ofPattern("yyyy-MM-dd")), null);
+        assertEquals(testDeadline.TaskInfo(), "[D] [ ] Return book (by:Aug 25 2022)");
+    }
+
+
+}

src/test/java/duke/EventTest.java

@@ -0,0 +1,18 @@
+package duke;
+
+import duke.task.Event;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class EventTest {
+
+    @Test
+    public void testEvent() {
+        Event testEvent =  new Event("project meeting", "Mon 2-4pm");
+        assertEquals(testEvent.TaskInfo(), "[E] [ ] project meeting (at:Mon 2-4pm)");
+    }
+
+
+}

src/test/java/duke/ToDoTest.java

@@ -0,0 +1,18 @@
+package duke;
+
+import duke.task.Task;
+
+import duke.task.ToDo;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ToDoTest {
+
+    @Test
+    public void toDoTest() {
+        Task testTask = new ToDo("Read book");
+        assertEquals(testTask.TaskInfo(), "[T] [ ] Read book");
+    }
+
+}