test: add coverage for generator templates

and matrix across Rails 7.2, 8.0, and main

.github/workflows/upstream.yml

@@ -43,8 +43,9 @@ jobs:
       fail-fast: false
       matrix:
         plat: ["ubuntu", "windows", "macos"]
+        ref: ["7-2-stable", "v8.0.0.beta1", "main"]
     env:
-      RAILSOPTS: --git=https://github.com/rails/rails --branch main
+      RAILSOPTS: --git=https://github.com/rails/rails --ref=${{ ref }}
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1

test/integration/user_journey_test.sh

@@ -37,7 +37,7 @@ bundle show --paths
 bin/rails tailwindcss:install
 
 # TEST: tailwind was installed correctly
-grep tailwind app/views/layouts/application.html.erb
+grep -q tailwind app/views/layouts/application.html.erb
 
 # TEST: rake tasks don't exec (#188)
 cat <<EOF >> Rakefile
@@ -47,3 +47,13 @@ end
 EOF
 
 bin/rails tailwindcss:build still_here | grep "Rake process did not exit early"
+
+if [[ $(rails -v) > "Rails 8.0.0.beta" ]] ; then
+  # TEST: presence of the generated file
+  bin/rails generate authentication
+  grep -q PasswordsController app/controllers/passwords_controller.rb
+fi
+
+# TEST: presence of the generated file
+bin/rails generate scaffold post title:string body:text published:boolean
+grep -q "Show this post" app/views/posts/index.html.erb