RFR: JDK-8357082 : Stabilize and add debug logs to CopyAreaOOB.java

[Sergey Bylokhov]

On Tue, 27 May 2025 23:51:05 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

>> @mrserb 
>> 
>> I can remove the EDT but I do think retaining them will stabilize this test based on the context of test failure.
>> 
>> - Test does NOT fail when it is run multiple times on macos-aarch64 but only when entire test suite is run. Can it still be synchronization issue if it is not reproducible when test is run multiple times?   
>> 
>> - The test repeated fails on macos-aarch64 only when the entire test suite is run so I suspect this could be the effect of couple of Graphics tests that was recently open-sourced and indeed this matches with the timeline that this test started to fail repeatedly on macos-aarch64.
>> 
>> - I didn't see any recent source code changesets that has direct relation to this test failure. There was one recent change to copyArea and ongoing subsequent change https://github.com/openjdk/jdk/pull/25340 but the test does not hit the code path in Blit.c or MaskBlit.c so that eliminates these changes as the cause.
>
> At the very least this test requires to be de-problemlisted to obtain the screenshots at the time of failure to see the state of the Frame.
> 
> This test repeatedly fails due to the same error at the same point (at x=267 y=212) which is about mid-way of the frame where the color is expected to be black but the actual is white.
> 
> 
> java.lang.RuntimeException: Test failed for background region at x=267 y=212 (expected=ff000000 actual=ffffffff)
> at CopyAreaOOB.testRegion(CopyAreaOOB.java:97)
> at CopyAreaOOB.paint(CopyAreaOOB.java:77) 
> 
> 
> **Expected Frame**
> 
> <img src="https://github.com/user-attachments/assets/b0af326e-f99f-474b-81a8-bb110cb0a37c" alt="background" width="150" height="150">

So it does not seems to be a test bug?

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PR Review Comment: https://git.openjdk.org/jdk/pull/25279#discussion_r2110640053