mocobeta commented on code in PR #828:
URL: https://github.com/apache/lucene/pull/828#discussion_r856765168


##########
help/tests.txt:
##########
@@ -128,6 +128,24 @@ specifying the project and test task or a fully qualified 
task path. Example:
 gradlew -p lucene/core test -Ptests.verbose=true --tests "TestDemo"
 
 
+Run GUI tests headlessly with Xvfb (Linux only)
+-----------------------------------------------
+
+GUI test for Luke application launches a window, this might mess up your
+monitor depending on the display manager you are using. In that case,
+you can install Xvfb (X Virtual Frame Buffer) so that the test runs on the
+virtual display and does not open a real window.
+
+# redhat-type OS
+$ sudo yum install Xvfb

Review Comment:
   It still will work for the moment; it might be better to encourage to use 
`dnf'.
   ```suggestion
   $ sudo dnf install Xvfb
   ```



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