Test installer

This commit adds test coverage for the installer Rake task and application template. The installer is run against a freshly generated Rails app using the version of Rails that is currently loaded. Thus the installer can be tested with different versions of Rails in CI.

Similar to rails/importmap-rails#206 for stimulus-rails

The motivation is to be able to move these tests from railties, see: rails/rails#49679

Co-authored-by: Jonathan Hefner <[email protected]>

.github/workflows/ci.yml

@@ -12,6 +12,7 @@ jobs:
           '6.0.0',
           '6.1.0',
           '7.0.1',
+          '7.1.2'
         ]
         ruby: [
           '2.7',
@@ -36,6 +37,7 @@ jobs:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: false
 
+    - uses: oven-sh/setup-bun@v1
     - name: Install Dependencies
       env:
         RAILS_VERSION: ${{ matrix.rails }}

test/installer_test.rb

@@ -0,0 +1,79 @@
+require 'test_helper'
+
+class InstallerTest < ActiveSupport::TestCase
+  include RailsAppHelpers
+
+  test "installer" do
+    with_new_rails_app do
+      if Rails::VERSION::MAJOR >= 7 && File.read("Gemfile").match?(/importmap-rails/)
+        run_command("bin/rails", "importmap:install")
+      end
+      _out, _err = run_command("bin/rails", "stimulus:install")
+
+      assert_match %r(import "(./)?controllers"), File.read("app/javascript/application.js")
+      assert_equal File.read("#{__dir__}/../lib/install/app/javascript/controllers/application.js"), File.read("app/javascript/controllers/application.js")
+      assert_equal File.read("#{__dir__}/../lib/install/app/javascript/controllers/hello_controller.js"), File.read("app/javascript/controllers/hello_controller.js")
+
+      if Rails::VERSION::MAJOR >= 7
+        assert_equal File.read("#{__dir__}/../lib/install/app/javascript/controllers/index_for_importmap.js"), File.read("app/javascript/controllers/index.js")
+        assert_match %(pin "@hotwired/stimulus", to: "stimulus.min.js"), File.read("config/importmap.rb")
+        assert_match %(pin "@hotwired/stimulus-loading", to: "stimulus-loading.js"), File.read("config/importmap.rb")
+        assert_match %(pin_all_from "app/javascript/controllers", under: "controllers"), File.read("config/importmap.rb")
+      else
+        assert_equal File.read("#{__dir__}/../lib/install/app/javascript/controllers/index_for_node.js"), File.read("app/javascript/controllers/index.js")
+        assert_match "@hotwired/stimulus", File.read("package.json")
+        assert_match "@hotwired/stimulus", File.read("yarn.lock")
+      end
+    end
+  end
+
+  test "installer with no javascript" do
+    with_new_rails_app %w[--skip-javascript] do
+      out, _err = run_command("bin/rails", "stimulus:install")
+
+      assert_match "You must either be running with node (package.json) or importmap-rails (config/importmap.rb) to use this gem.", out
+    end
+  end
+
+  test "installer with pre-existing application.js" do
+    with_new_rails_app do
+      if Rails::VERSION::MAJOR >= 7 && File.read("Gemfile").match?(/importmap-rails/)
+        run_command("bin/rails", "importmap:install")
+      end
+      File.write("app/javascript/application.js", "// pre-existing")
+      _out, _err = run_command("bin/rails", "stimulus:install")
+
+      assert_match "// pre-existing", File.read("app/javascript/application.js")
+    end
+  end
+
+  if Gem::Version.new(Rails.version) >= Gem::Version.new("7.1")
+    test "installer with bun" do
+      with_new_rails_app %w[--javascript=bun] do
+        run_command("bin/rails", "javascript:install:bun")
+        _out, _err = run_command("bin/rails", "stimulus:install")
+
+        assert_match %r(import "(./)?controllers"), File.read("app/javascript/application.js")
+        assert_equal File.read("#{__dir__}/../lib/install/app/javascript/controllers/application.js"), File.read("app/javascript/controllers/application.js")
+        assert_equal File.read("#{__dir__}/../lib/install/app/javascript/controllers/hello_controller.js"), File.read("app/javascript/controllers/hello_controller.js")
+
+        assert_equal File.read("#{__dir__}/../lib/install/app/javascript/controllers/index_for_node.js"), File.read("app/javascript/controllers/index.js")
+
+        assert_match "@hotwired/stimulus", File.read("package.json")
+      end
+    end
+  end
+
+  private
+    def with_new_rails_app(options=[], &block)
+      super do
+        if Dir.exist?("app/javascript") && !File.exist?("app/javascript/application.js")
+          File.write("app/javascript/application.js", <<~JS, mode: "a+")
+            import "./controllers"
+          JS
+        end
+
+        block.call
+      end
+    end
+end

test/test_helper.rb

@@ -1,8 +1,54 @@
 require 'rails'
 require "rails/test_help"
+require "fileutils"
 
 # Configure Rails Environment
 ENV["RAILS_ENV"] = "test"
 
 # Set fixture path
 ActiveSupport::TestCase.file_fixture_path = File.expand_path("fixtures", __dir__)
+
+module RailsAppHelpers
+  def self.included(base)
+    base.include ActiveSupport::Testing::Isolation
+  end
+
+  private
+    def create_new_rails_app(app_dir, options=[])
+      require "rails/generators/rails/app/app_generator"
+      Rails::Generators::AppGenerator.start([app_dir, *options, "--skip-bundle", "--skip-bootsnap", "--quiet"])
+
+      Dir.chdir(app_dir) do
+        gemfile = File.read("Gemfile")
+
+        gemfile.gsub!(/^gem ["']stimulus-rails["'].*/, "")
+        gemfile << %(gem "stimulus-rails", path: #{File.expand_path("..", __dir__).inspect}\n)
+
+        if Rails::VERSION::PRE == "alpha"
+          gemfile.gsub!(/^gem ["']rails["'].*/, "")
+          gemfile << %(gem "rails", path: #{Gem.loaded_specs["rails"].full_gem_path.inspect}\n)
+        end
+
+        File.write("Gemfile", gemfile)
+
+        run_command("bundle", "install")
+      end
+    end
+
+    def with_new_rails_app(options=[], &block)
+      require "digest/sha1"
+      variant = [RUBY_VERSION, Gem.loaded_specs["rails"].full_gem_path,]
+      app_name = "app_#{Digest::SHA1.hexdigest(variant.to_s)}"
+
+      Dir.mktmpdir do |tmpdir|
+        create_new_rails_app("#{tmpdir}/#{app_name}", *options)
+        Dir.chdir("#{tmpdir}/#{app_name}", &block)
+      end
+    end
+
+    def run_command(*command)
+      Bundler.with_unbundled_env do
+        capture_subprocess_io { system(*command, exception: true) }
+      end
+    end
+end