ci: test against the different package managers

Author: G-Rath

.github/workflows/ruby.yml

@@ -58,6 +58,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        js_package_manager:
+          - name: npm
+            installer: npm
+          - name: yarn_classic
+            installer: yarn
+          - name: pnpm
+            installer: pnpm
         ruby: [2.7]
         gemfile:
           # These have shakapacker:
@@ -73,12 +80,13 @@ jobs:
       # Workaround b/c upgrading Minitest broke some mocking expectations
       # having to do with automatic kwarg splatting
       MT_KWARGS_HACK: 1
+      PACKAGE_JSON_FALLBACK_MANAGER: ${{ matrix.js_package_manager.name }}
     steps:
     - uses: actions/checkout@v4
       with:
         persist-credentials: false
     - uses: actions/setup-node@v3
-    - run: npm -g install yalc
+    - run: npm -g install yalc ${{ matrix.js_package_manager.installer }}
     - run: yalc publish
     - name: Save root node_modules to cache
       uses: actions/cache@v3
@@ -94,14 +102,15 @@ jobs:
       with:
         bundler: 2.4.9
         ruby-version: ${{ matrix.ruby }}
+    - run: ./test/bin/create-fake-js-package-managers ${{ matrix.js_package_manager.installer }}
     - name: Save dummy app ruby gems to cache
       uses: actions/cache@v3
       with:
         path: test/dummy/vendor/bundle
         key: dummy-app-gem-cache-${{ hashFiles('${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile.lock') }}
     - name: Install Ruby Gems for dummy app
       run: bundle lock --add-platform 'x86_64-linux' && bundle check --path=test/dummy/vendor/bundle || bundle _2.4.9_ install --frozen --path=test/dummy/vendor/bundle --jobs=4 --retry=3
-    - run: cd test/dummy && yalc add react_ujs && yarn
+    - run: cd test/dummy && yalc add react_ujs && ${{ matrix.js_package_manager.installer }} install
     - run: bundle exec rake test
       env:
         NODE_OPTIONS: --openssl-legacy-provider

test/bin/create-fake-js-package-managers

@@ -0,0 +1,36 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+# creates a set of fake JavaScript package managers in a temporary bin
+# directory for GitHub Actions, _excluding_ the one passed in as an
+# argument in order to assert that only that package manager is used
+
+require "tmpdir"
+
+# setup the bin directory we want to use
+bin_dir = Dir.mktmpdir("react-rails-")
+
+if ENV["GITHUB_ACTIONS"]
+  puts "adding #{bin_dir} to GITHUB_PATH..."
+  File.write(ENV.fetch("GITHUB_PATH"), "#{bin_dir}\n", mode: "a+")
+end
+
+managers = %w[npm yarn pnpm]
+manager_in_use = ARGV[0]
+
+Dir.chdir(bin_dir) do
+  managers.each do |manager|
+    next if manager == manager_in_use
+
+    puts "creating #{bin_dir}/#{manager}..."
+    File.write(
+      manager,
+      <<~CONTENTS
+        #!/usr/bin/env node
+
+        throw new Error("(#{manager}) this is not the package manager you're looking...");
+      CONTENTS
+    )
+    File.chmod(0o755, manager)
+  end
+end