<Swing Dev> RFR: 8273043: [TEST_BUG] Automate NimbusJTreeSelTextColor.java

[Sergey Bylokhov]

On Thu, 26 Aug 2021 19:21:13 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> Automated NimbusJTreeSelTextColor.java test which is added under [JDK-8271315](https://bugs.openjdk.java.net/browse/JDK-8271315).
> 
> It passes with the recent build of JDK 18.  
> It fails with JDK 18 build 7 where [JDK-8266510](https://bugs.openjdk.java.net/browse/JDK-8266510) is not fixed yet:
> 
> 
> Exception in thread "main" java.lang.RuntimeException: Unexpected color found: ff000000 at (4, 9);
> foreground: ffffffff; background: ff39698a - check image.png
>         at NimbusJTreeSelTextColor.checkColors(NimbusJTreeSelTextColor.java:106)
>         at NimbusJTreeSelTextColor.main(NimbusJTreeSelTextColor.java:70)
> 
> 
> The line is wrapped for readability. In this case the text is black instead of white.

test/jdk/javax/swing/plaf/nimbus/NimbusJTreeSelTextColor.java line 70:

> 68:             treeBounds.width -= iconOffset;
> 69:             treeBounds.width -= 2; // crop selection border on the right
> 70:             BufferedImage image = robot.createScreenCapture(treeBounds);

Can we skip the usage of the robot and render it directly to the buffered image? probably this will allow running the test in a headless envirement?

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PR: https://git.openjdk.java.net/jdk/pull/5269