Introduce suspenders:production_environment generator

lib/generators/suspenders/production_environment_generator.rb

@@ -0,0 +1,6 @@
+module Suspenders
+  module Generators
+    class ProductionEnvironmentGenerator < Rails::Generators::Base
+    end
+  end
+end

test/generators/suspenders/production_environment_generator_test.rb

@@ -0,0 +1,35 @@
+require "test_helper"
+require "generators/suspenders/production_environment_generator"
+
+module Suspenders
+  module Generators
+    class ProductionEnvironmentGenerator::DefaultTest < Rails::Generators::TestCase
+      include Suspenders::TestHelpers
+
+      tests Suspenders::Generators::ProductionEnvironmentGenerator
+      destination Rails.root
+      setup :prepare_destination
+      teardown :restore_destination
+
+      test "configures the asset host" do
+        run_generator
+        assert_file app_root("config/environments/production.rb") do |file|
+          assert_match(
+            /^ +config.asset_host = ENV.fetch("ASSET_HOST", ENV.fetch("APPLICATION_HOST"))$/,
+            file
+          )
+        end
+      end
+
+      private
+
+      def prepare_destination
+        backup_file "config/environments/produciton.rb"
+      end
+
+      def restore_destination
+        restore_file "config/environments/produciton.rb"
+      end
+    end
+  end
+end