Fix css paths

Gemfile

@@ -6,8 +6,8 @@ group :development, :test do
   gem 'actionpack'
   gem 'byebug', platform: [:ruby], require: false
   gem 'rubocop', require: false
-  gem 'rspec-rails', '~> 3.6'
-  gem 'capybara', '~> 2.16'
+  gem 'rspec-rails', '~> 3.8'
+  gem 'capybara', '~> 3.14'
   gem 'pry-rails'
 end
 

critical-path-css-rails.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |gem|
   gem.executables  = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }
   gem.require_path = 'lib'
 
-  gem.add_development_dependency 'combustion', '~> 0.7.0'
+  gem.add_development_dependency 'combustion', '~> 1.1.0'
 
   gem.extensions = ['ext/npm/extconf.rb']
 end

lib/critical_path_css/rails/config_loader.rb

@@ -22,9 +22,12 @@ def format_css_paths
         if config['css_path']
           config['css_path']  = format_path(config['css_path'])
           config['css_paths'] = []
-        else
+        elsif config['css_paths']
           config['css_path']  = ''
           config['css_paths'] = config['css_paths'].collect { |path| format_path(path) }
+        else
+          config['css_path']  = ActionController::Base.helpers.stylesheet_path(config['manifest_name'], host: '')
+          config['css_paths'] = []
         end
       end
 

lib/critical_path_css/rails/version.rb

@@ -1,5 +1,5 @@
 module CriticalPathCSS
   module Rails
-    VERSION = '3.0.0'.freeze
+    VERSION = '3.0.1'.freeze
   end
 end

spec/lib/critical_path_css/rails/config_loader_spec.rb

@@ -63,6 +63,32 @@
       end
     end
 
+    context 'when no paths are specified' do
+      let(:config_file) {
+        <<~CONFIG
+          defaults: &defaults
+            base_url: http://0.0.0.0:9292
+            manifest_name: application
+            routes:
+              - /
+
+          development:
+            <<: *defaults
+
+          test:
+            <<: *defaults
+        CONFIG
+      }
+
+      it 'sets css_path with the path' do
+        expect(subject.config['css_path']).to eq '/stylesheets/application.css'
+      end
+
+      it 'leaves css_paths empty' do
+        expect(subject.config['css_paths']).to eq []
+      end
+    end
+
     context 'when single css_path and multiple css_paths are both specified' do
       let(:config_file) {
         <<~CONFIG

spec/spec_helper.rb

@@ -10,6 +10,8 @@
 require 'capybara/rails'
 
 RSpec.configure do |config|
+  config.include Capybara::DSL
+
   config.use_transactional_fixtures = true
 
   # Enable flags like --only-failures and --next-failure