reftest: add a test in admin to check repo version and its upgrade ad…

…vice

master_changes.md

@@ -176,6 +176,7 @@ users)
   * Add a test showing the behaviour of `opam upgrade` with packages flagged with `avoid-version`/`deprecated` [#6273 @kit-ty-kate]
   * Add a test showing the behaviour when a pin depend is unpinned [#6380 @rjbou]
   * Add a test to ensure `opam upgrade <pkg>` will not upgrade unrelated things [#6373 @kit-ty-kate]
+  * Add a test in admin to test repository version upgrade advice [#6385 @rjbou]
 
 ### Engine
 

tests/reftests/admin.test

@@ -766,3 +766,23 @@ no-extra.1
 no-extra.2
 ### opam admin list --short --all-versions --latests-only
 no-extra.2
+### ::: Test opam repo version warning
+### rm -rf packages
+### <packages/dummy/dummy.1/opam>
+opam-version: "2.0"
+### : repo 1.2
+### <repo>
+opam-version: "1.2"
+### opam admin list --short
+[WARNING] The repository is at version 1.2, please consider upgrading to 2.0 with 'opam admin upgrade'
+dummy
+### : missing repo, assuming 1.2
+### rm repo
+### opam admin list --short
+[WARNING] The repository is at version 1.2, please consider upgrading to 2.0 with 'opam admin upgrade'
+dummy
+### : repo 2.0
+### <repo>
+opam-version: "2.0"
+### opam admin list --short
+dummy