def test_copy():
# make sure the vectors are copied and each have their own copy of
# the data
mv = MultiVector()
mv[Multiindex([1, 2, 3])] = FlatVector([3, 4, 5])
mv[Multiindex([1, 2, 4])] = FlatVector([3, 4, 7])
assert_equal(mv[Multiindex([1, 2, 3])], FlatVector([3, 4, 5]))
assert_equal(mv[Multiindex([1, 2, 4])], FlatVector([3, 4, 7]))
mv2 = mv.copy()
mv[Multiindex([1, 2, 3])].coeffs[2] = 8
assert_equal(mv2[Multiindex([1, 2, 3])], FlatVector([3, 4, 5]))
assert_equal(mv2[Multiindex([1, 2, 4])], FlatVector([3, 4, 7]))
assert_equal(mv[Multiindex([1, 2, 3])], FlatVector([3, 4, 8]))
