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from __future__ import annotations
import pendulum
def test_dst_add():
start = pendulum.datetime(2017, 3, 7, tz="America/Toronto")
end = start.add(days=6)
interval = end - start
new_end = start + interval
assert new_end == end
def test_dst_add_non_variable_units():
start = pendulum.datetime(2013, 3, 31, 1, 30, tz="Europe/Paris")
end = start.add(hours=1)
interval = end - start
new_end = start + interval
assert new_end == end
def test_dst_subtract():
start = pendulum.datetime(2017, 3, 7, tz="America/Toronto")
end = start.add(days=6)
interval = end - start
new_start = end - interval
assert new_start == start
def test_naive_subtract():
start = pendulum.naive(2013, 3, 31, 1, 30)
end = start.add(hours=1)
interval = end - start
new_end = start + interval
assert new_end == end
def test_negative_difference_subtract():
start = pendulum.datetime(2018, 5, 28, 12, 34, 56, 123456)
end = pendulum.datetime(2018, 1, 1)
interval = end - start
new_end = start + interval
assert new_end == end
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