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https://issues.apache.org/jira/browse/LUCENE-10528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17526073#comment-17526073
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Robert Muir commented on LUCENE-10528:
--------------------------------------

I guess i'm just proposing we either:
1. auto-detect xvfb is available, and use it if it is: if {{sh -c "command -v 
xvfb-run"}} returns 0, prefix java command with "xvfb-run".
2. add gradle option to prefix java command with xvfb-run.

It is easy to install for our CI servers. I think overall it would IMPROVE 
testing. Today they run headless and skip the test:
{noformat}
# redhat-type OS
$ sudo yum install Xvfb 

# ubuntu/debian-type OS
$ sudo apt install xvfb

# arch
$ sudo pacman -S yum install Xvfb
{noformat}

> TestScripts.testLukeCanBeLaunched creates X Window when running the tests
> -------------------------------------------------------------------------
>
>                 Key: LUCENE-10528
>                 URL: https://issues.apache.org/jira/browse/LUCENE-10528
>             Project: Lucene - Core
>          Issue Type: Task
>            Reporter: Robert Muir
>            Priority: Major
>
> When running the tests, this one causes my entire desktop to "flicker" when 
> it creates some kind of X-Window very quickly and then destroys it. I use 
> tiling window manager, so whole desktop gets rearranged for a split second, 
> and I'd rather it not happen :)
> I first tried adding -Djava.awt.headless=true to both org.gradle.jvmargs and 
> tests.jvmargs in my .gradle/gradle.properties. doesn't work, as the test 
> doesnt use these when launching luke.
> I next tried hacking the test by adding this to the ProcessBuilderThingy, but 
> it didn't help either:
> {noformat}
> .envvar("LAUNCH_OPTS", "-Djava.awt.headless=true")
> {noformat}
> One way I can work around it, is to unset {{DISPLAY}} env var so that it 
> won't create this window. test still passes:
> {noformat}
> $ unset DISPLAY
> $ ./gradlew :lucene:distribution.tests:test
> ... (no window gets created)
> {noformat}
> So maybe as a workaround, we can just not pass DISPLAY environment variable 
> through to this test?



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