Run a test until it fails in order to reproduce an intermittent test failure.

infinitest.sh

#!/bin/bash
# Change MOZCONFIG to point to a different build configuration or comment it out to use the default.
export MOZCONFIG=.mozconfig-opt 
declare -i count=0
result=0
while [ $result -eq 0 ]
do
# Modify the next line to specify the exact mach invocation that should be tried.
mach mochitest-browser browser/devtools/debugger/test/browser_dbg_event-listeners.js 
#mach xpcshell-test -d toolkit/devtools/server/tests/unit/test_dbgsocket.js
result=$?
count+=1
done
echo "Intermittent failure after $count runs."