def test_is_na_string(self):
a = Vector(["a", "b", ""])
assert a.is_na().tolist() == [False, False, True]
def test_is_na_float(self):
a = Vector([1, 2, None])
assert a.is_na().tolist() == [False, False, True]
def test_is_na_object(self):
a = Vector([self, self, None])
assert a.is_na().tolist() == [False, False, True]
def test_is_na_datetime(self):
a = Vector([DATETIME, DATETIME, NaT])
assert a.is_na().tolist() == [False, False, True]
