def test_sequence_indexing1():
# Test adding, moving, deleting pulse in a sequence.
root = RootSequence()
root.time_constrained = True
root.sequence_duration = '1.0'
context = TestContext()
root.context = context
pulse1 = Pulse()
pulse2 = Pulse()
pulse3 = Pulse()
root.items.append(pulse1)
assert_equal(pulse1.index, 1)
assert_is(pulse1.root, root)
assert_items_equal(root.linkable_vars, ['sequence_end',
'1_start', '1_stop', '1_duration'])
root.items.append(pulse2)
assert_equal(pulse1.index, 1)
assert_equal(pulse2.index, 2)
assert_is(pulse2.root, root)
assert_items_equal(root.linkable_vars, ['sequence_end',
'1_start', '1_stop', '1_duration',
'2_start', '2_stop', '2_duration'])
root.items.append(pulse3)
assert_equal(pulse1.index, 1)
assert_equal(pulse2.index, 2)
assert_equal(pulse3.index, 3)
assert_is(pulse3.root, root)
assert_items_equal(root.linkable_vars, ['sequence_end',
'1_start', '1_stop', '1_duration',
'2_start', '2_stop', '2_duration',
'3_start', '3_stop', '3_duration'])
root.time_constrained = False
root.items.remove(pulse2)
assert_equal(pulse1.index, 1)
assert_equal(pulse2.index, 0)
assert_equal(pulse3.index, 2)
assert_is(pulse2.root, None)
assert_items_equal(root.linkable_vars, ['1_start', '1_stop', '1_duration',
'2_start', '2_stop', '2_duration'])
root.items.insert(1, pulse2)
assert_equal(pulse1.index, 1)
assert_equal(pulse2.index, 2)
assert_equal(pulse3.index, 3)
assert_is(pulse2.root, root)
assert_items_equal(root.linkable_vars, ['1_start', '1_stop', '1_duration',
'2_start', '2_stop', '2_duration',
'3_start', '3_stop', '3_duration'])
