def test_month_length2():
assert gp2.month_length("January") == 31, "expect 31"
def test_month_length1():
assert gp2.month_length("September") == 30, "expect 30"
def test_month_length4():
assert gp2.month_length("February", leap_year=True) == 29, "expect 29"
def test_month_length5():
assert gp2.month_length(1) == None
def test_month_length3():
assert gp2.month_length("February") == 28, "expect 28"