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import time
from datetime import datetime
from tango import TimeVal
from tango.test_utils import assert_close
def test_timeval():
# test constructors
from_default = TimeVal()
assert from_default.tv_sec == 0
assert from_default.tv_usec == 0
assert from_default.tv_nsec == 0
from_ints = TimeVal(1, 2, 3)
assert from_ints.tv_sec == 1
assert from_ints.tv_usec == 2
assert from_ints.tv_nsec == 3
from_int = TimeVal(100)
assert from_int.tv_sec == 100
assert from_int.tv_usec == 0
assert from_int.tv_nsec == 0
from_float = TimeVal(100.200300400)
assert from_float.tv_sec == 100
assert from_float.tv_usec == 200300
assert from_float.tv_nsec == 400
from_datetime = TimeVal(datetime.now())
assert from_datetime.tv_sec > 0
# test convertors:
now_float = time.time()
now_tv = TimeVal(now_float)
assert_close(now_float, now_tv.totime())
now_datetime = datetime.now()
now_tv = TimeVal(now_datetime)
assert now_tv.todatetime() == now_datetime
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