Add JUnit tests

src/test/java/duke/ParserTest.java

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+package duke;
+
+import duke.command.ByeCommand;
+import duke.command.Command;
+import duke.command.ListCommand;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class ParserTest {
+    @Test
+    public void parseCommand_unkownCommand_exceptionThrown() {
+        try {
+            Command c = Parser.parse("asd");
+        } catch (DukeException e) {
+            assertTrue(e.getMessage().contains("I'm sorry, but I don't know what that means :-("));
+        }
+    }
+
+    @Test
+    public void parseCommand_byeCommand_byeCommandObjectCreated() {
+        try {
+            Command c = Parser.parse("bye");
+            assertTrue(c instanceof ByeCommand);
+
+        } catch (DukeException e) {
+            System.out.println("Test failed");
+        }
+    }
+
+    @Test
+    public void parseCommand_listCommand_listCommandObjectCreated() {
+        try {
+            Command c = Parser.parse("list");
+            assertTrue(c instanceof ListCommand);
+
+        } catch (DukeException e) {
+            System.out.println("Test failed");
+        }
+    }
+
+    @Test
+    public void parseCommand_unspecifiedDoneCommand_exceptionThrown() {
+        try {
+            Command c = Parser.parse("done");
+        } catch (DukeException e) {
+            assertTrue(e.getMessage().contains("Please enter a valid task number for me to mark as done."));
+        }
+    }
+}

src/test/java/duke/command/ByeCommandTest.java

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+package duke.command;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class ByeCommandTest {
+    @Test
+    public void isExitTrue_byeCommandCreated_true() {
+        Command test = new ByeCommand();
+        assertTrue(test.isExit());
+    }
+
+}

src/test/java/duke/task/DeadlineTest.java

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+package duke.task;
+
+import duke.DukeException;
+import duke.Parser;
+import duke.command.Command;
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class DeadlineTest {
+    @Test
+    public void createDeadline_withoutDateTime_exceptionThrown() {
+        try {
+            Deadline d = new Deadline("submission", "");
+        } catch (DukeException e) {
+            assertTrue(e.getMessage().contains("Please input date and time in correct format"));
+        }
+    }
+
+    @Test
+    public void createDeadline_withoutInvalidDateTime_exceptionThrown() {
+        try {
+            Deadline d = new Deadline("submission", "2020/14/54 2810");
+        } catch (DukeException e) {
+            assertTrue(e.getMessage().contains("Please input date and time in correct format"));
+        }
+    }
+
+    @Test
+    public void createDeadline_withDateTime_deadlineCreated() {
+        try {
+            Deadline d = new Deadline("submission", "2020/11/14 15:30");
+            assertTrue(d instanceof Deadline);
+        } catch (DukeException e) {
+            System.out.println("Test failed");
+        }
+    }
+}

src/test/java/duke/task/ToDoTest.java

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+package duke.task;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ToDoTest {
+    @Test
+    public void createTodo_withDescription_stringReturned() {
+        ToDo test = new ToDo("Walk Dog");
+        assertEquals("T | 0 | Walk Dog",test.toString());
+    }
+
+    @Test
+    public void createTodo_withOutDescription_stringReturned() {
+        ToDo test = new ToDo("");
+        assertEquals("T | 0 | ",test.toString());
+    }
+}