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TST: don't actually render 1k+ date ticks #16973

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Merged
timhoffm merged 1 commit into from
Mar 31, 2020
Merged

TST: don't actually render 1k+ date ticks #16973

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4 changes: 3 additions & 1 deletion lib/matplotlib/tests/test_dates.py
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Original file line number Diff line number Diff line change
Expand Up @@ -152,13 +152,15 @@ def test_too_many_date_ticks(caplog):
'Attempting to set identical left == right' in str(rec[0].message)
ax.plot([], [])
ax.xaxis.set_major_locator(mdates.DayLocator())
fig.canvas.draw()
v = ax.xaxis.get_major_locator()()
assert len(v) > 1000
# The warning is emitted multiple times because the major locator is also
# called both when placing the minor ticks (for overstriking detection) and
# during tick label positioning.
assert caplog.records and all(
record.name == "matplotlib.ticker" and record.levelname == "WARNING"
for record in caplog.records)
assert len(caplog.records) > 0


@image_comparison(['RRuleLocator_bounds.png'])
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