def test_of_intro(self):
expected = "="
self.assertEqual(of_intro(), expected)
expected = "=="
self.assertEqual(of_intro(True), expected)
def test_of_formula(self):
expected = "of:= SUM([.A1:.A2])"
self.assertEqual(of_formula(of_intro(False), "SUM([.A1:.A2])"), expected)
expected = "of:== SUM([.A1:.A2])"
self.assertEqual(of_formula(of_intro(True), "SUM([.A1:.A2])"), expected)