def test_fuse_getitem(): def load(*args): pass dsk = {'x': (load, 'store', 'part', ['a', 'b']), 'y': (getitem, 'x', 'a')} dsk2 = fuse_getitem(dsk, load, 3) dsk2 = cull(dsk2, 'y') assert dsk2 == {'y': (load, 'store', 'part', 'a')}