Add JUnit tests

src/test/java/DeadlineTest.java

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+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
+public class DeadlineTest {
+    @Test
+    public void testDeadlinePrinting_correctFormat_success() throws DukeException {
+        Task d = new Deadline("proj", "2019-10-15 2359");
+        assertEquals("[D][\u2718] proj (by: Tue, 15 Oct 2019, 23:59)", d.toString());
+    }
+
+    @Test
+    public void testDeadlinePrinting_wrongFormat_exceptionThrown() {
+        try {
+            Task d = new Deadline("project", "Sunday");
+            fail();
+        } catch (DukeException ex) {
+            String error = "UHOH! You need to use the proper format!\n"
+                    + "eg deadline return book /by 2019-10-15 2359";
+            assertEquals(error, ex.getMessage());
+        }
+    }
+
+    @Test
+    public void testDeadlinePrinting_doneDeadline_success() throws DukeException {
+        Task d = new Deadline("proj", "2019-10-15 2359");
+        d.markDone();
+        assertEquals("[D][\u2713] proj (by: Tue, 15 Oct 2019, 23:59)", d.toString());
+    }
+
+    @Test
+    public void testToTaskData_doneDeadline_success() throws DukeException {
+        Task d = new Deadline("proj", "2019-10-15 2359");
+        d.markDone();
+        assertEquals("D ; 1 ; proj ; 2019-10-15 2359", d.toTaskData());
+    }
+
+    @Test
+    public void testToTaskData_notDoneDeadline_success() throws DukeException {
+        Task d = new Deadline("proj", "2019-10-15 2359");
+        assertEquals("D ; 0 ; proj ; 2019-10-15 2359", d.toTaskData());
+    }
+
+}

src/test/java/EventTest.java

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+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
+public class EventTest {
+    @Test
+    public void testEventPrinting_correctFormat_success() throws DukeException {
+        Task e = new Event("meeting", "2019-10-15 1200");
+        assertEquals("[E][\u2718] meeting (at: Tue, 15 Oct 2019, 12:00)", e.toString());
+    }
+
+    @Test
+    public void testEventPrinting_wrongFormat_exceptionThrown() {
+        try {
+            Task e = new Event("meeting", "Sunday");
+            fail();
+        } catch (DukeException ex) {
+            String error = "UHOH! You need to use the proper format!\n"
+                    + "eg event project meeting /at 2019-10-15 1200";
+            assertEquals(error, ex.getMessage());
+        }
+    }
+
+    @Test
+    public void testEventPrinting_doneEvent_success() throws DukeException {
+        Task e = new Event("meeting", "2019-10-15 1200");
+        e.markDone();
+        assertEquals("[E][\u2713] meeting (at: Tue, 15 Oct 2019, 12:00)", e.toString());
+    }
+
+    @Test
+    public void testToTaskData_doneEvent_success() throws DukeException {
+        Task e = new Event("meeting", "2019-10-15 1200");
+        e.markDone();
+        assertEquals("E ; 1 ; meeting ; 2019-10-15 1200", e.toTaskData());
+    }
+
+    @Test
+    public void testToTaskData_notDoneDeadline_success() throws DukeException {
+        Task e = new Event("meeting", "2019-10-15 1200");
+        assertEquals("E ; 0 ; meeting ; 2019-10-15 1200", e.toTaskData());
+    }
+}

src/test/java/ParserTest.java

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+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
+public class ParserTest {
+    @Test
+    public void parse_exitCommand_success() throws DukeException {
+        assertEquals(true, Parser.parse("bye") instanceof ExitCommand);
+    }
+
+    @Test
+    public void parse_helpCommand_success() throws DukeException {
+        assertEquals(true, Parser.parse("help") instanceof HelpCommand);
+    }
+
+    @Test
+    public void parse_listCommand_success() throws DukeException {
+        assertEquals(true, Parser.parse("list") instanceof ListCommand);
+    }
+
+    @Test
+    public void parse_doneCommand_success() throws DukeException {
+        assertEquals(true, Parser.parse("done 1") instanceof DoneCommand);
+    }
+
+    @Test
+    public void parse_doneCommand_exceptionThrown() {
+        try {
+            Parser.parse("done");
+            fail();
+        } catch (DukeException ex) {
+            String error = "UHOH! You need to specify which task to mark done! \n"
+                    +  "eg done 1";
+            assertEquals(error, ex.getMessage());
+        }
+    }
+
+    @Test
+    public void parse_deleteCommand_success() throws DukeException {
+        assertEquals(true, Parser.parse("delete 1") instanceof DeleteCommand);
+    }
+
+    @Test
+    public void parse_deleteCommand_exceptionThrown() {
+        try {
+            Parser.parse("delete");
+            fail();
+        } catch (DukeException ex) {
+            String error = "UHOH! You need to specify which task to delete!\n"
+                    + "eg delete 1";
+            assertEquals(error, ex.getMessage());
+        }
+    }
+
+    @Test
+    public void parse_addCommand_success() throws DukeException {
+        assertEquals(true, Parser.parse("todo read") instanceof AddCommand);
+        assertEquals(true,
+                Parser.parse("deadline project /by 2019-10-15 2359") instanceof AddCommand);
+        assertEquals(true,
+                Parser.parse("event meeting /at 2019-10-15 1200") instanceof AddCommand);
+    }
+
+    @Test
+    public void parse_unknownCommand_exceptionThrown() {
+        try {
+            Parser.parse("hello");
+            fail();
+        } catch (DukeException ex) {
+            String error = "UHOH! Sorry, I don't understand what you are saying! D=\n"
+                    + "Type \"help\" to view the list of commands you can use!";
+            assertEquals(error, ex.getMessage());
+        }
+    }
+}

src/test/java/TodoTest.java

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+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class TodoTest {
+    @Test
+    public void testTodoPrinting_doneTodo_success() {
+        Task todo = new Todo("read");
+        todo.markDone();
+        assertEquals("[T][\u2713] read", todo.toString());
+    }
+
+    @Test
+    public void testTodoPrinting_notDoneTodo_success() {
+        Task todo = new Todo("read");
+        assertEquals("[T][\u2718] read", todo.toString());
+    }
+
+    @Test
+    public void testToTaskData_doneTodo_success() {
+        Task todo = new Todo("read");
+        todo.markDone();
+        assertEquals("T ; 1 ; read", todo.toTaskData());
+    }
+
+    @Test
+    public void testToTaskData_notDoneTodo_success() {
+        Task todo = new Todo("read");
+        assertEquals("T ; 0 ; read", todo.toTaskData());
+    }
+}