def test_delete_invalid_key(self, capsys):
DataBag._data = {'foo': {'a': {}}}
assert DataBag.delete('foo.a.baz') is -1
def test_delete_key(self):
DataBag._data = {'foo': {'a': 42, 'b': 2}}
assert DataBag.delete('foo.a') is 1
assert DataBag._data == {'foo': {'b': 2}}