Fix flaky tests - #92
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The scrolling is not entirely precise, it's sometimes off by a pixel or two. Increase the tolerance to 2 pixels.
We would often see 'Broken pipe' errors pulluting the logs when running tests. Broken pipe errors occur when browser aborts connection. It can be because the browser was navigated to a different url before the current page finished loading, but it could also be because it started downloading an image, but decided that the image didn't change after loading part of it, and aborts the connection to use the version from the cache. The broken pipe errors are benign and are actually suppressed by default in Django 1.8.
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See code comment for more info. Unfortunately, I wasn't able to find anything better than time.sleep().
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Can you switch the build status graphic in README.md to Circle CI, and remove |
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@bradenmacdonald I switched the graphic and removed |
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@mtyaka Great :) If you remove the old |
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This PR tries to fix the situation with flaky tests by:
test_scroll_into_view) more robust by increasing the scroll check tolerance,test_author_changes). The block was reloaded immediately after the browser page was loaded in selenium. Selenium blocks while the page is loading, but it doesn't block on any ajax requests that happen after page load. The mentoring xblock requests some data at page load time via ajax (initXBlockView), which was probably causing a race condition where both the ajax request and thereload_pb_blocktest helper method were trying toget_or_createblock instance data at the same time. Unfortunately I wasn't able to prove this, but theMultipleObjectsReturnedhasn't occurred since this change.