def test_task_properties_exceptions():
t = Task("Foobar")
# Since we cannot set completed > 1 we can use pytest
# to check for python errors using the following syntax.
with pytest.raises(ValueError):
t.completed = 2
# Cannot set completed < 0
with pytest.raises(ValueError):
t.completed = -1
# Cannot use set property on creation_datetime
with pytest.raises(AttributeError):
t.creation_datetime = datetime.now()
