def test_append_empty_path():
path = Path((1, 0, 0))
path.line_to((2, 0, 0))
start = path.start
end = path.end
path.append_path(Path())
assert start == path.start and end == path.end, "path should be unchanged"
def test_append_path_with_a_gap():
p1 = Path((1, 0, 0))
p1.line_to((2, 0, 0))
p2 = Path((3, 0, 0))
p2.line_to((4, 0, 0))
p1.append_path(p2)
assert p1.start == (1, 0)
assert p1.end == (4, 0)
assert len(p1) == 3