Implement A-JUnit

src/test/java/duke/ParserTest.java

@@ -0,0 +1,22 @@
+package duke;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class ParserTest {
+    @Test
+    void parseCommand_Parser_Test() {
+        try {
+            Parser.parseCommand("deadline");
+        } catch (DukeException e) {
+            assertEquals("The description of a deadline cannot be empty.", e.getMessage());
+        }
+    }
+
+    @Test
+    void stopProgram_Parser_Test() {
+        assertTrue(Parser.stopProgram("bye"));
+    }
+}

src/test/java/duke/task/TodoTest.java

@@ -0,0 +1,18 @@
+package duke.task;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class TodoTest {
+    @Test
+    void taskToArray_ToDo_Test() {
+        Todo todo = new Todo("Return book");
+        String[] expected_arr = new String[]{"T", "1", "Return book"};
+        assertArrayEquals(expected_arr, todo.taskToArray());
+    }
+
+
+
+}