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Add tests for WebAgg using Playwright #23540

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5e73cde
Add general test for WebAgg backend
QuLogic Aug 3, 2022
6085413
WebAgg: Add test for the toolbar
QuLogic Aug 3, 2022
67b2c02
WebAgg: Add test for toolbar save button
QuLogic Aug 3, 2022
9860201
WebAgg: Add a test for resizing the figure
QuLogic Aug 3, 2022
704f737
WebAgg: Add tests for pan/zoom tool
QuLogic Aug 3, 2022
5faacc8
WebAgg: Add tests of the zoom-to-rect tool
QuLogic Aug 3, 2022
17ad7e9
ci: Explicitly ask for all browsers
QuLogic Oct 4, 2022
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WebAgg: Add a test for resizing the figure
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@QuLogic
QuLogic committed Sep 23, 2026
commit 9860201e5a837cda03e67f5655ee694e5dd8e1a9
39 changes: 39 additions & 0 deletions lib/matplotlib/tests/test_backend_webagg.py
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Expand Up @@ -148,6 +148,45 @@ def test_webagg_general(page, request):
_raise_on_image_difference(expected, actual, tol=0)


@pytest.mark.backend('webagg')
def test_webagg_resize(page, request):
# Only macOS is well-supported by Playwright and other platforms are inconsistent.
# https://github.com/microsoft/playwright/issues/31017
if page.context.browser.browser_type.name == 'webkit' and sys.platform != 'darwin':
request.applymarker(
pytest.mark.xfail(reason="Playwright's WebKit does not support CSS resize"))

# Listen for all console logs.
page.on('console', lambda msg: print(f'CONSOLE: {msg.text}'))
# Increase the viewport to at least twice the size of the default figure.
# Playwright seems to have a bug with mouse movement in Firefox that places the
# cursor somewhere near the origin when outside the viewport size.
page.set_viewport_size({'width': 1600, 'height': 1200})

fig, ax = plt.subplots(facecolor='w')
orig_bbox = fig.bbox.frozen()

# Don't start the Tornado event loop, but use the existing event loop
# started by the `page` fixture.
WebAggApplication.initialize()
WebAggApplication.started = True

page.goto(f'http://{WebAggApplication.address}:{WebAggApplication.port}/')

canvas = page.locator('canvas.mpl-canvas')

# Resize the canvas to be twice as big.
bbox = canvas.bounding_box()
x, y = bbox['x'] + bbox['width'] - 1, bbox['y'] + bbox['height'] - 1
page.mouse.move(x, y)
page.mouse.down()
page.mouse.move(x + bbox['width'], y + bbox['height'])
page.mouse.up()

assert fig.bbox.height == orig_bbox.height * 2
assert fig.bbox.width == orig_bbox.width * 2


@pytest.mark.filterwarnings('ignore:Treat the new Tool classes:UserWarning')
@pytest.mark.backend('webagg')
@pytest.mark.parametrize('toolbar', ['toolbar2', 'toolmanager'])
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