create catch-all fixture generator for all static fixtures

spec/javascripts/fixtures/static_fixtures.rb

+require 'spec_helper'
+
+describe ApplicationController, '(Static JavaScript fixtures)', type: :controller do
+  include JavaScriptFixturesHelpers
+
+  before(:all) do
+    clean_frontend_fixtures('static/')
+  end
+
+  fixtures_path = File.expand_path(JavaScriptFixturesHelpers::FIXTURE_PATH, Rails.root)
+  haml_fixtures = Dir.glob(File.expand_path('**/*.haml', fixtures_path)).map do |file_path|
+    file_path.sub(/\A#{fixtures_path}#{File::SEPARATOR}/, '')
+  end
+
+  haml_fixtures.each do |template_file_name|
+    it "static/#{template_file_name.sub(/\.haml\z/, '.raw')}" do |example|
+      fixture_file_name = example.description
+      rendered = render_template(template_file_name)
+      store_frontend_fixture(rendered, fixture_file_name)
+    end
+  end
+
+  private
+
+  def render_template(template_file_name)
+    fixture_path = JavaScriptFixturesHelpers::FIXTURE_PATH
+    controller = ApplicationController.new
+    controller.prepend_view_path(fixture_path)
+    controller.render_to_string(template: template_file_name, layout: false)
+  end
+end