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Backport PR #20817 on branch v3.4.x (Make test_change_epoch more robust.) #20823

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merged 1 commit into from Aug 10, 2021
Merged

Backport PR #20817 on branch v3.4.x (Make test_change_epoch more robust.) #20823

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5 changes: 4 additions & 1 deletion lib/matplotlib/tests/test_dates.py
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Expand Up @@ -1004,12 +1004,15 @@ def test_datetime64_in_list():
def test_change_epoch():
date = np.datetime64('2000-01-01')

# use private method to clear the epoch and allow it to be set...
mdates._reset_epoch_test_example()
mdates.get_epoch() # Set default.

with pytest.raises(RuntimeError):
# this should fail here because there is a sentinel on the epoch
# if the epoch has been used then it cannot be set.
mdates.set_epoch('0000-01-01')

# use private method to clear the epoch and allow it to be set...
mdates._reset_epoch_test_example()
mdates.set_epoch('1970-01-01')
dt = (date - np.datetime64('1970-01-01')).astype('datetime64[D]')
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