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test for align_ylabel bug with constrained_layout #19373

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Merged
merged 3 commits into from
Jan 31, 2021
Merged

test for align_ylabel bug with constrained_layout #19373

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3235ed8
test for align_ylabel constrained_layout bug: first implementation
Jan 27, 2021
40f7848
fixed formatting
Jan 27, 2021
2ab0e05
do not call plot(), set explicit positive y_lim for subplots, fix for…
Jan 28, 2021
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34 changes: 34 additions & 0 deletions lib/matplotlib/tests/test_constrainedlayout.py
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Original file line number Diff line number Diff line change
Expand Up @@ -521,3 +521,37 @@ def test_bboxtight():
def test_bbox():
fig, ax = plt.subplots(constrained_layout=True)
ax.set_aspect(1.)


def test_align_labels():
"""
Tests for a bug in which constrained layout and align_ylabels on
three unevenly sized subplots, one of whose y tick labels include
negative numbers, drives the non-negative subplots' y labels off
the edge of the plot
"""
fig, (ax3, ax1, ax2) = plt.subplots(3, 1, constrained_layout=True,
figsize=(6.4, 8),
gridspec_kw={"height_ratios": (1, 1,
0.7)})

ax1.set_ylim(0, 1)
ax1.set_ylabel("Label")

ax2.set_ylim(-1.5, 1.5)
ax2.set_ylabel("Label")

ax3.set_ylim(0, 1)
ax3.set_ylabel("Label")

fig.align_ylabels(axs=(ax3, ax1, ax2))

fig.canvas.draw()
after_align = [ax1.yaxis.label.get_window_extent(),
ax2.yaxis.label.get_window_extent(),
ax3.yaxis.label.get_window_extent()]
# ensure labels are approximately aligned
np.testing.assert_allclose([after_align[0].x0, after_align[2].x0],
after_align[1].x0, rtol=0, atol=1e-05)
# ensure labels do not go off the edge
assert after_align[0].x0 >= 1