Question : How to create *-expected.png for blink_web_tests

[Jihwan Kim]

I'm fixing issue with pickers, but some tests failed.
It was a failure due to image diff.

Since the resource (css) file is modified, it is correct that the image diff appears,
So I have to modify the some *-expected.png files.
(ex: datetimelocal-month-year-selector-expected.png)

And my question is -
Are there any rules or tools to create *-expected.png?
or is it manual work (crop after screen capture, etc.)?

This is my first time about an image comparison test,
so please understand even if the question is too basic.

[Mathias Bynens]

Use --reset-results: https://chromium.googlesource.com/chromium/src/+/HEAD/docs/testing/web_tests.md#test-harness-options

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[Xianzhu Wang]

See also: https://chromium.googlesource.com/chromium/src/+/HEAD/docs/testing/web_test_expectations.md#How-to-rebaseline for other options.

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CADizRgbbezvsx1iF5rqKgiPMAikZg74sTwiK1E4BNN4TtjAEWg%40mail.gmail.com.

[Jihwan Kim]

Thanks for help!

I have one more question.

There are 3 platforms on WPT. (Linux, Mac, Windows)

In this case, to create new *-expected.png, should I have all these three devices?

2022년 3월 14일 월요일 오후 4시 41분 30초 UTC+9에 Xianzhu Wang님이 작성:

[Xianzhu Wang]

• blink_tool.py rebaseline-cl: can rebaseline for all platforms.
• run_web_tests.py --reset-results: can rebaseline for your current platform, or if the baseline is not platform-dependent.
• rebaseline script in results.html: can rebaseline for a particular platform (which can be different from your current platform) at a time, or if the baseline is not platform-dependent.

See the how-to-rebaseline document for more details about the above options.

[Jihwan Kim]

Really really thanks!

have  a good day :)

2022년 3월 14일 월요일 오후 11시 0분 24초 UTC+9에 Xianzhu Wang님이 작성: