def test_ctor():
p = media.Playlist([1, 2, 3, 4, 5])
assert len(p) == 5
p = media.Playlist()
assert len(p) == 0
p = media.Playlist([])
assert len(p) == 0
def test_iter():
p = media.Playlist([1, 2, 3, 4])
index = 0
for i in p.iter():
index += 1
assert index == 4
i = iter(p.iter())
assert next(i) == 1
assert next(i) == 2
assert next(i) == 3
assert next(i) == 4
with pytest.raises(StopIteration):
assert next(i)
i = iter(p.iter())
assert next(i) == 1
assert next(i) == 2
p.append(100)
p.append(200)
assert next(i) == 3
assert next(i) == 4
assert next(i) == 100
assert next(i) == 200
def test_setitem():
p = media.Playlist([1, 2, 3])
assert p[0] == 1
assert p[1] == 2
p[0] = 100
assert p[0] == 100
assert p[1] == 2
def test_getitem():
p = media.Playlist([1, 2, 3, 4, 5])
assert p[0] == 1
assert p[1] == 2
assert p[4] == 5
def test_len():
p = media.Playlist()
assert len(p) == 0
p.append(1)
assert len(p) == 1
def test_clear():
p = media.Playlist([1, 2, 3, 4, 5])
p.clear()
assert len(p) == 0
def test_add():
p = media.Playlist()
assert isinstance(p + [1, 2, 3], media.Playlist)
assert len(p) == 0
p += [1, 2, 3, 4]
assert len(p) == 4
def test_append():
p = media.Playlist()
p.append(1)
p.append(2)
assert len(p) == 2
