def test_horizontal_stack():
alpha = Space(1)
beta = Space(2)
a = Interval(0,2)
b = Interval(0,2)
x = Chart([a,b], alpha)
y = Chart([a,b], beta)
# -------------
s = hstack(x,y)
# -------------
block, coords = s[[0,0]]
assert block == alpha
assert coords == [0,0]
block, coords = s[[0,1]]
assert block == alpha
assert coords == [0,1]
block, coords = s[[0,2]]
assert block == beta
assert coords == [0,0]
block, coords = s[[2,4]]
assert block == beta
assert coords == [2,2]
def test_multiple_charts():
alpha = Space(1)
beta = Space(2)
a = Interval(0,2)
b = Interval(0,2)
x = Chart([a,b], alpha)
y = Chart([a,b], beta)
# -------------
s = hstack(x,y)
