Functional verification of adding 4 tasks

AddTasksTests.java

    @Test
    public void testAddTasksInDifferentCategories(){
        String task1 = "fix bug";
        String task2 = "wash car";
        String task3 = "grocery shopping";
        String task4 = "get nails done";

        screen.addItem(task1, TasksScreen.TaskColor.PURPLE);
        screen.addItem(task2, TasksScreen.TaskColor.YELLOW);
        screen.addItem(task3, TasksScreen.TaskColor.BLUE);
        screen.addItem(task4, TasksScreen.TaskColor.PINK);

        List tasks = screen.getTasks();
        assertTrue(tasks.contains(task1), task1 + " not on the list");
        assertTrue(tasks.contains(task2), task2 + " not on the list");
        assertTrue(tasks.contains(task3), task3 + " not on the list");
        assertTrue(tasks.contains(task4), task4 + " not on the list");
        assertEquals(tasks.size(), 4, "Number of todo items");
    }