public void testNull()
	{
		System.out.println("\nStarting testNull: tasks");
		
		try
		{
			new Task(null, john, jane);
			fail("Illegal Argument Exception expected!");
		}
		catch (IllegalArgumentException iae)
		{
		}
		
		try
		{
			new Task(title, null, jane);
			fail("Illegal Argument Exception expected!");
		}
		catch (IllegalArgumentException iae)
		{
		}
		
		try
		{
			new Task(title, john, null);
			fail("Illegal Argument Exception expected!");
		}
		catch (IllegalArgumentException iae)
		{
		}
		
		try
		{
			new Task(title, null, null);
			fail("Illegal Argument Exception expected!");
		}
		catch (IllegalArgumentException iae)
		{
		}
		
		try
		{
			new Task(null, null, null);
			fail("Illegal Argument Exception expected!");
		}
		catch (IllegalArgumentException iae)
		{
		}
		
		newTask = new Task(title, john, jane);
		
		try
		{
			newTask.setDescription(null);
			fail("Illegal Argument Exception expected!");
		}
		catch (IllegalArgumentException iae)
		{
		}
		
		try
		{
			newTask.setComments(null);
			fail("Illegal Argument Exception expected!");
		}
		catch (IllegalArgumentException iae)
		{
		}
		
		try
		{
			newTask.setPriority(null);
			fail("Illegal Argument Exception expected!");
		}
		catch (IllegalArgumentException iae)
		{
		}
		
		try
		{
			newTask.setStatus(null);
			fail("Illegal Argument Exception expected!");
		}
		catch (IllegalArgumentException iae)
		{
		}
		
		System.out.println("Finished testNull: tasks");
	}