[test][lib] Add duplicate key test

2 jobs for <span class="ref-name">82_duplicate_key_handling</span> in 11 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
canceled #166911
docker-build
build_linux_36

00:00:06

canceled #166912
macosx
build_macosx_36

00:00:11