def test_divide_other_two_numbers():
c = Calc()
res = c.div(9, 2)
assert res == 4.5
def test_div_by_zero_returns_inf():
c = Calc()
res = c.div(99, 0)
assert res == 'inf'
def test_divide_two_numbers_float():
c = Calc()
res = c.div(13, 2)
assert res == 6.5