RFR: 8328716: [TestBug] Screen capturing utility for failed tests

[Andy Goryachev]

On Fri, 28 Mar 2025 21:04:00 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Introduce a facility, in the form of JUnit5 annotation, to allow for capturing a desktop screenshot of a failed test.
>> 
>> The primary intent is to be able to debug an intermittent test case, rather than wholesale addition of the new annotation to all the tests.
>> 
>> A possible improvement could be to output a data URL
>> 
>> `data:image/png;base64,iVBORw0KGgoAAAANSUhEU...`
>> 
>> so it can be rendered in Safari (Chrome truncates the image possibly due to following a url length limit)
>
> tests/system/src/test/java/test/util/ScreenCaptureTestWatcher.java line 47:
> 
>> 45:  * <p>
>> 46:  * This facility takes a screenshot of any failed test, then logs the base64-encoded screenshot
>> 47:  * to {@code stderr}.
> 
> This should not be on by default, but should be "opt in" on a System property. I recommend defining a gradle property to do this and map it to that System property, much like we do for "UNSTABLE_TEST" and others.

The intent is not to annotate each test, but rather to use this tool to debug the issues in an intermittently failing test.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1746#discussion_r2021218682