def test_auto_position_first(self, m_gai):
"""Set position to 1 if no other instances exist."""
m_gai.return_value = []
p1 = Index()
# Since Index is not a declarative model, but a mixin that
# adds a column to models, p1.position needs to be set to None before
# using auto_position to prevent a TypeError from being raised due to
# attempting to interpret an unbound column as a boolean.
p1.position = None
p1.auto_position()
assert p1.position == 1
def test_auto_position_with_others(self, m_gai):
p1 = Index()
p1.position = 1
p2 = Index()
p2.position = 2
p3 = Index()
p3.position = 3
m_gai.return_value = [p1, p2, p3]
p4 = Index()
p4.position = None
p4.auto_position()
assert p4.position == 4
