def test_initialized_empty():
pl = PathList()
assert len(pl) == 0
assert pl == []
assert "a" not in pl
assert pl.count("") == 0
with pytest.raises(ValueError):
pl.index(None)
with pytest.raises(IndexError):
_ = pl[1]
for x in pl:
assert False
def test_list_access():
pl = PathList([1, 2, 3])
assert 1 in pl
assert 3 in pl
assert pl == [1, 2, 3]
assert pl[0] == 1
assert pl[2] == 3
assert pl.count(1) == 1
assert pl[:2] == [1, 2]
assert pl[1:] == [2, 3]
assert pl[:] == [1, 2, 3]
assert pl[1:2] == [2]
assert pl[::2] == [1, 3]
assert pl[-1] == 3
assert pl[-2:] == [2, 3]