Plotly pane UI tests: plot rendered

[thuydotm]

Test if plot is rendered when creating a panel.pane.Plotly object.

We also want to test if the data in Python reflects the actions from the UI. For example, to check if click_data is updated when clicking on a plot. In order to do so, at least we'll need to know if the position we click contains some data or not. I found the locator.bounding_box() and page.mouse.click() quite helpful but haven't been able to do what I want. At the moment, clicking on an arbitrary pixel within a plot's bounding box always returns None.

[codecov[bot]]

Codecov Report

Merging #3746 (bdc3384) into master (7550f75) will increase coverage by 0.04%. The diff coverage is 97.80%.

@@            Coverage Diff             @@
##           master    #3746      +/-   ##
==========================================
+ Coverage   82.93%   82.98%   +0.04%     
==========================================
  Files         220      221       +1     
  Lines       32047    32138      +91     
==========================================
+ Hits        26579    26669      +90     
- Misses       5468     5469       +1     

Flag	Coverage Δ
ui-tests	34.08% <95.60%> (+0.18%)	:arrow_up:
unitexamples-tests	75.55% <30.76%> (-0.12%)	:arrow_down:

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Impacted Files	Coverage Δ
panel/tests/ui/pane/test_plotly.py	97.80% <97.80%> (ø)
panel/util.py	87.54% <0.00%> (+0.37%)	:arrow_up:

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