[rubygems/rubygems] Add useful error message for plugin load

If a plugin has previously been installed, but the path is no longer
valid, `rake setup` will fail with an unexpected error due to the file
not existing.

Instead, we want to present the user with what the issue is and how to
resolve the problem.

https://github.com/rubygems/rubygems/commit/0c6ad3ecbb

1 files changed, 23 insertions, 0 deletions

diff --git a/spec/bundler/bundler/plugin_spec.rb b/spec/bundler/bundler/plugin_spec.rb
index 3ac7b251a3..fea3925000 100644
--- a/spec/bundler/bundler/plugin_spec.rb
+++ b/spec/bundler/bundler/plugin_spec.rb
@@ -333,5 +333,28 @@ RSpec.describe Bundler::Plugin do
         end.to output("win\n").to_stdout
       end
     end
+
+    context "the plugin load_path is invalid" do
+      before do
+        allow(index).to receive(:load_paths).with("foo-plugin").
+          and_return(["invalid-file-name1", "invalid-file-name2"])
+      end
+
+      it "outputs a useful warning" do
+        msg =
+          "The following plugin paths don't exist: invalid-file-name1, invalid-file-name2.\n\n" \
+          "This can happen if the plugin was " \
+          "installed with a different version of Ruby that has since been uninstalled.\n\n" \
+          "If you would like to reinstall the plugin, run:\n\n" \
+          "bundler plugin uninstall foo-plugin && bundler plugin install foo-plugin\n\n" \
+          "Continuing without installing plugin foo-plugin.\n"
+
+        expect(Bundler.ui).to receive(:warn).with(msg)
+
+        Plugin.hook(Bundler::Plugin::Events::EVENT1)
+
+        expect(subject.loaded?("foo-plugin")).to be_falsey
+      end
+    end
   end
 end