WIP Introduce suspenders:lint generator

Gemfile.lock

@@ -231,6 +231,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-21
+  arm64-darwin-22
   x86_64-linux
 
 DEPENDENCIES

NEWS.md

@@ -3,6 +3,7 @@ Unreleased
 * Remove `suspenders` system executable
 * Introduce `suspenders:accessibility` generator
 * Introduce `Suspenders::Generators::APIAppUnsupported` module and concern
+* Introduce `suspenders:lint` generator
 
 20230113.0 (January, 13, 2023)
 

README.md

@@ -30,6 +30,12 @@ Installs [capybara_accessibility_audit] and [capybara_accessible_selectors]
   [capybara_accessibility_audit]: https://github.com/thoughtbot/capybara_accessibility_audit
   [capybara_accessible_selectors]: https://github.com/citizensadvice/capybara_accessible_selectors
 
+### Lint
+
+Installs [standard].
+
+  [standard]: https://github.com/standardrb/standard
+
 ## Contributing
 
 See the [CONTRIBUTING] document.

lib/generators/suspenders/lint_generator.rb

@@ -0,0 +1,14 @@
+module Suspenders
+  module Generators
+    class LintGenerator < Rails::Generators::Base
+      desc "Sets up standard"
+
+      def setup_standard
+        gem "standard", group: [:development, :test]
+        Bundler.with_unbundled_env { run "bundle install" }
+        prepend_to_file("Rakefile", 'require "standard/rake"')
+      end
+    end
+  end
+end
+

test/generators/suspenders/lint_generator_test.rb

@@ -0,0 +1,66 @@
+require "test_helper"
+require "generators/suspenders/lint_generator"
+
+module Suspenders
+  module Generators
+    class LintGeneratorTest < Rails::Generators::TestCase
+      include Suspenders::TestHelpers
+
+      tests Suspenders::Generators::LintGenerator
+      destination Rails.root
+      setup :prepare_destination
+      teardown :restore_destination
+
+      test "adds gem to Gemfile" do
+        expected_output = <<~RUBY
+          gem "standard", group: [:development, :test]
+        RUBY
+
+        run_generator
+
+        assert_file app_root("Gemfile") do |file|
+          assert_match(expected_output, file)
+        end
+      end
+
+      test "adds require to Rakefile" do
+        expected_output = <<~RUBY
+          require "standard/rake"
+        RUBY
+
+        run_generator
+
+        assert_file app_root("Rakefile") do |file|
+          assert_match(expected_output.strip, file.strip)
+        end
+      end
+
+      test "installs gem with Bundler" do
+        Bundler.stubs(:with_unbundled_env).yields
+        generator.expects(:run).with("bundle install").once
+
+        capture(:stdout) do
+          generator.setup_standard
+        end
+      end
+
+      test "generator has a description" do
+        description = "Sets up standard"
+
+        assert_equal description, Suspenders::Generators::LintGenerator.desc
+      end
+
+      private
+
+      def prepare_destination
+        touch "Gemfile"
+        touch "Rakefile"
+      end
+
+      def restore_destination
+        remove_file_if_exists "Gemfile"
+        remove_file_if_exists "Rakefile"
+      end
+    end
+  end
+end