def test_RunLengthList_copy_copies_non_empty():
r = RunLengthList([(0, 'foo')])
assert r == r.copy()
assert not r.items() is r.copy().items()
def test_Metaline_insert_fg_bg_on_too_long():
fores, backs = RunLengthList([(0, 'foo')]), RunLengthList([(0, 'bar')])
m = Metaline('foo', fores.copy(), backs.copy())
m.insert(2, 'bar')
assert m.fores == fores, m.backs == backs
def test_copy_returns_different_lists():
r = RunLengthList([(0, 'foo')])
assert r.items() is not r.copy().items()
