def test_empty(VectorArray):
with pytest.raises(Exception):
VectorArray.empty(-1)
with pytest.raises(Exception):
VectorArray.empty(1, reserve=-1)
for dim, r in product((0, 1, 2, 10, 100), (0, 1, 100)):
v = VectorArray.empty(dim, reserve=r)
assert v.dim == dim
assert len(v) == 0
if hasattr(v, 'data'):
d = v.data
assert d.shape == (0, dim)
