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The system test scaffold generator is failing when a rails project lacks system tests #559

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#561
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The system test scaffold generator is failing when a rails project lacks system tests#559
#561
@rschultheis

Description

@rschultheis
rschultheis
opened on Jul 1, 2025

Using versions: tailwindcss-rails 4.1.8 and rails 8.0.2.

Rails projects created with the --skip-system-test --css=tailwind combination of arguments get an exception when using the rails scaffold generator due to some code in this project.

To reproduce:

rails new --skip-system-test --css=tailwind bugdemo
cd bugdemo
rails generate scaffold demobug

That results in this stack trace:

rails generate scaffold demobug
      invoke  active_record
      create    db/migrate/20250701122835_create_demobugs.rb
      create    app/models/demobug.rb
      invoke    test_unit
      create      test/models/demobug_test.rb
      create      test/fixtures/demobugs.yml
      invoke  resource_route
       route    resources :demobugs
      invoke  scaffold_controller
      create    app/controllers/demobugs_controller.rb
      invoke    tailwindcss
      create      app/views/demobugs
      create      app/views/demobugs/index.html.erb
      create      app/views/demobugs/edit.html.erb
      create      app/views/demobugs/show.html.erb
      create      app/views/demobugs/new.html.erb
      create      app/views/demobugs/_form.html.erb
      create      app/views/demobugs/_demobug.html.erb
      invoke    resource_route
      invoke    test_unit
      create      test/controllers/demobugs_controller_test.rb
        gsub      test/system/demobugs_test.rb
/Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/actions/file_manipulation.rb:271:in 'IO.binread': No such file or directory @ rb_sysopen - /Users/rob/workspace/bugdemo/test/system/demobugs_test.rb (Errno::ENOENT)
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/actions/file_manipulation.rb:271:in 'Thor::Actions#gsub_file'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/tailwindcss-rails-4.2.3/lib/generators/test_unit/scaffold/scaffold_generator.rb:8:in 'TestUnit::Generators::ScaffoldGenerator#fix_system_test'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/command.rb:28:in 'Thor::Command#run'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:127:in 'Thor::Invocation#invoke_command'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'block in Thor::Invocation#invoke_all'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'Hash#each'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'Enumerable#map'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'Thor::Invocation#invoke_all'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/group.rb:243:in 'Thor::Group.dispatch'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:116:in 'Thor::Invocation#invoke'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/group.rb:288:in 'block in Thor::Group#_invoke_for_class_method'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/shell.rb:68:in 'Thor::Shell#with_padding'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/group.rb:277:in 'Thor::Group#_invoke_for_class_method'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/group.rb:134:in 'Rails::Generators::ScaffoldControllerGenerator#_invoke_from_option_test_framework'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/command.rb:28:in 'Thor::Command#run'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:127:in 'Thor::Invocation#invoke_command'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'block in Thor::Invocation#invoke_all'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'Hash#each'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'Enumerable#map'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'Thor::Invocation#invoke_all'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/group.rb:243:in 'Thor::Group.dispatch'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:116:in 'Thor::Invocation#invoke'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/group.rb:288:in 'block in Thor::Group#_invoke_for_class_method'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/shell.rb:68:in 'Thor::Shell#with_padding'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/group.rb:277:in 'Thor::Group#_invoke_for_class_method'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/group.rb:134:in 'Rails::Generators::ScaffoldGenerator#_invoke_from_option_scaffold_controller'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/command.rb:28:in 'Thor::Command#run'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:127:in 'Thor::Invocation#invoke_command'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'block in Thor::Invocation#invoke_all'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'Hash#each'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'Enumerable#map'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:134:in 'Thor::Invocation#invoke_all'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/group.rb:243:in 'Thor::Group.dispatch'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/base.rb:584:in 'Thor::Base::ClassMethods#start'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/generators.rb:265:in 'Rails::Generators.invoke'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands/generate/generate_command.rb:26:in 'Rails::Command::GenerateCommand#perform'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/command.rb:28:in 'Thor::Command#run'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor/invocation.rb:127:in 'Thor::Invocation#invoke_command'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command/base.rb:178:in 'Rails::Command::Base#invoke_command'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/thor-1.3.2/lib/thor.rb:538:in 'Thor.dispatch'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command/base.rb:73:in 'Rails::Command::Base.perform'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:65:in 'block in Rails::Command.invoke'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:143:in 'Rails::Command.with_argv'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/command.rb:63:in 'Rails::Command.invoke'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/railties-8.0.2/lib/rails/commands.rb:18:in '<main>'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/3.4.0/bundled_gems.rb:82:in 'Kernel.require'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/3.4.0/bundled_gems.rb:82:in 'block (2 levels) in Kernel#replace_require'
	from /Users/rob/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bootsnap-1.18.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in 'Kernel#require'
	from bin/rails:4:in '<main>'

The issue seems to be this bit of code assuming a system test file exists:

tailwindcss-rails/lib/generators/test_unit/scaffold/scaffold_generator.rb

Line 8 in ed7d059

gsub_file File.join("test/system", class_path, "#{file_name.pluralize}_test.rb"),

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