def test_from_milliseconds():
original_ts = Timestamp.now()
ts_from_milliseconds = Timestamp.from_milliseconds(
original_ts.to_milliseconds())
assert ts_from_milliseconds.seconds == original_ts.seconds
assert ts_from_milliseconds.nanos == int(original_ts.nanos / 10**6) * 10**6
def test_datetime():
now = datetime.utcnow()
ts = Timestamp.from_datetime(now)
assert isinstance(ts.seconds, int)
assert isinstance(ts.nanos, int)
assert ts.to_datetime() == now
def test_from_seconds():
original_ts = Timestamp.now()
ts_from_seconds = Timestamp.from_seconds(original_ts.to_seconds())
assert ts_from_seconds.seconds == original_ts.seconds
def test_now():
ts_now = Timestamp.now().to_datetime()
assert datetime.now() - ts_now < timedelta(seconds=1)
def test_from_json_string():
original_ts = Timestamp.now()
ts_from_json_string = Timestamp.from_json_string(
original_ts.to_json_string())
assert ts_from_json_string == original_ts