def test_abrupt_negative_change(self):
# abrupt negative change = < -7 in 3 hours
self.pm.check_delta([-7, None], window=3*3600+1, absolute_value=False)
expected = pd.DataFrame(
array([['Test', 'B', Timestamp('2017-01-01 10:00:00'), Timestamp('2017-01-01 12:00:00'), 3, 'Delta < lower bound, -7']], dtype=object),
columns=['System Name', 'Variable Name', 'Start Date', 'End Date', 'Timesteps', 'Error Flag'],
index=RangeIndex(start=0, stop=1, step=1)
)
assert_frame_equal(expected, self.pm.test_results)
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