def test_grid_can_have_a_single_cell():
shape = ()
for i in range(10):
shape = shape + (1,)
g = Grid(shape)
assert len(g) == 1
assert g.dim() == len(shape)
assert tuple(g.shape()) == shape
def test_grid_one_dim_same_as_list():
l = list(range(10))
g = Grid((len(l),))
assert len(g) == len(l)
assert g.dim() == 1
assert tuple(g) == tuple(l)
for i in l:
assert g.coordinates(i) == (i,)
assert g.index((i,)) == i
def test_grid_can_be_empty():
g = Grid(())
assert len(g) == 0
assert g.dim() == 0
assert tuple(g.shape()) == ()
def test_grid_can_be_null_along_one_axis():
g = Grid((3, 0, 4))
assert len(g) == 0
assert g.dim() == 3
assert_raises(IndexError, lambda: g.index((0, 0, 0)))
assert_raises(IndexError, lambda: g.coordinates(0))
