luaPackages.plenary-nvim: add code to run tests

... but dont enable it just yet since it is so damn flaky. Passed on my
laptop but not on CI.

pkgs/development/lua-modules/overrides.nix

@@ -2,6 +2,11 @@
 { stdenv
 , cargo
 , cmake
+
+# plenary utilities
+, which
+, findutils
+, coreutils
 , curl
 , cyrus_sasl
 , dbus
@@ -439,6 +444,32 @@ with prev;
   });
 
 
+  plenary-nvim = prev.plenary-nvim.overrideAttrs (oa: {
+    postPatch = ''
+      sed -Ei lua/plenary/curl.lua \
+          -e 's@(command\s*=\s*")curl(")@\1${curl}/bin/curl\2@'
+    '';
+
+    # disabled for now because too flaky
+    doCheck = false;
+    # for env/find/ls
+    checkInputs = [
+      which
+      neovim-unwrapped
+      coreutils
+      findutils
+    ];
+
+    checkPhase = ''
+      runHook preCheck
+      # remove failing tests, need internet access for instance
+      rm tests/plenary/job_spec.lua tests/plenary/scandir_spec.lua tests/plenary/curl_spec.lua
+      export HOME="$TMPDIR"
+      make test
+      runHook postCheck
+    '';
+  });
+
   # as advised in https://github.com/luarocks/luarocks/issues/1402#issuecomment-1080616570
   # we shouldn't use luarocks machinery to build complex cmake components
   libluv = stdenv.mkDerivation {