def test_order_formulas_by_dependency_bad_reference_raises_value_error(self):
facts = ('A', 'B')
formulas = {
'Y':'A*B*C',
'Z':'Y*A*B*C',
}
f = lambda:formula_parser.order_formulas_by_dependency(formulas, facts)
self.assertRaises(ValueError, f)
def test_order_formulas_by_dependency(self):
facts = ('A', 'B', 'C')
formulas = {
'V':'A*B*C',
'W':'V*A*B*C',
'X':'V*W*A*B*C',
'Y':'V*W*X*A*B*C',
'Z':'V*W*X*Y*A*B*C',
}
order = formula_parser.order_formulas_by_dependency(formulas, facts)
assert order == ['V', 'W', 'X', 'Y', 'Z']
