[Test]Modified favorite task test

src/test/java/seedu/address/logic/commands/FavoriteTaskCommandTest.java

@@ -59,7 +59,7 @@ public void favoriteTask_indexTooSmall() throws IllegalValueException {
 	}
 
 	@Test
-	public void favoriteTask_validIndex() throws IllegalValueException {
+	public void favoriteTask_duplicateFavorite() throws IllegalValueException {
 		/* 
 		 * CommandResult should return a string that denotes success in execution if index given 
 		 * to favoriteTaskCommand constructor is within the range of added tasks.
@@ -72,6 +72,21 @@ public void favoriteTask_validIndex() throws IllegalValueException {
 		String expected = String.format(FavoriteTaskCommand.MESSAGE_FAVORITE_TASK_SUCCESS, "[Floating Task][Description: Task 1]");
 		assertCommandFeedback(command, expected);
 	}
+
+	@Test
+	public void favoriteTask_validIndex() throws IllegalValueException {
+		/* 
+		 * CommandResult should return a string that the task 
+		 * has already been favorited
+		 */
+		InMemoryTaskList model;
+		model = TestUtil.setupSomeFavoritedTasksInTaskList(3);
+		FavoriteTaskCommand command = new FavoriteTaskCommand(2);
+		command.setData(model);
+
+		String expected = String.format(FavoriteTaskCommand.MESSAGE_TASK_ALR_FAVORITED);
+		assertCommandFeedback(command, expected);
+	}
 
 	/*
 	 * Given a command and an expected string, execute the command

src/test/java/seedu/address/testutil/TestUtil.java

@@ -47,21 +47,37 @@ public static InMemoryTaskList setupFloatingTasks(int n) throws IllegalValueExce
 		return newTaskList;
 	}
 
-	// Setting up tasks in the TaskList in order to find them in the tests
+	// Setting up completed tasks in the TaskList in order to find them in the tests
 		public static InMemoryTaskList setupSomeCompletedTasksInTaskList(int n) throws IllegalValueException {
-			InMemoryTaskList newTaskList = new TaskManager();
-			// Add 3 tasks into the task manager
-			for (int i = 0; i < n; i++) {
-				AddTaskCommand command = new AddTaskCommand(String.format("Task %d", i));
-				command.setData(newTaskList);
-				command.execute();
-			}
-			UnmodifiableObservableList<Task> list= newTaskList.getCurrentFilteredTasks();
-			for (int i = 0; i < n; i++) {
-				list.get(i).setAsComplete();
-			}
-			return newTaskList;
+		InMemoryTaskList newTaskList = new TaskManager();
+		// Add 3 tasks into the task manager
+		for (int i = 0; i < n; i++) {
+			AddTaskCommand command = new AddTaskCommand(String.format("Task %d", i));
+			command.setData(newTaskList);
+			command.execute();
 		}
+		UnmodifiableObservableList<Task> list= newTaskList.getCurrentFilteredTasks();
+		for (int i = 0; i < n; i++) {
+			list.get(i).setAsComplete();
+		}
+		return newTaskList;
+	}
+
+	// Setting up favorited tasks in the TaskList in order to find them in the tests
+	public static InMemoryTaskList setupSomeFavoritedTasksInTaskList(int n) throws IllegalValueException {
+		InMemoryTaskList newTaskList = new TaskManager();
+		// Add 3 tasks into the task manager
+		for (int i = 0; i < n; i++) {
+			AddTaskCommand command = new AddTaskCommand(String.format("Task %d", i));
+			command.setData(newTaskList);
+			command.execute();
+		}
+		UnmodifiableObservableList<Task> list= newTaskList.getCurrentFilteredTasks();
+		for (int i = 0; i < n; i++) {
+			list.get(i).setAsFavorite();
+		}
+		return newTaskList;
+	}
 	/**
 	 * Setting up interleaved Floating, Deadline and Event tasks.
 	 * Dates for Deadline tasks are set to 1 January 2016.