Support .js.jsx.coffee files with Sprockets 4

.travis.yml

@@ -49,8 +49,6 @@ matrix:
 
   allow_failures:
     - rvm: jruby-9.0.1.0
-    - gemfile: gemfiles/rails_4.2_sprockets_4.gemfile
-    - gemfile: gemfiles/rails_5_sprockets_4.gemfile
 
 before_install:
   - mkdir travis-phantomjs

lib/react/rails/railtie.rb

@@ -104,6 +104,8 @@ class Railtie < ::Rails::Railtie
           if Gem::Version.new(Sprockets::VERSION) >= Gem::Version.new("4.x")
             sprockets_env.register_mime_type("application/jsx", extensions: [".jsx", ".js.jsx", ".es.jsx", ".es6.jsx"])
             sprockets_env.register_transformer("application/jsx", "application/javascript", React::JSX::Processor)
+            sprockets_env.register_mime_type("application/jsx+coffee", extensions: [".jsx.coffee", ".js.jsx.coffee"])
+            sprockets_env.register_transformer("application/jsx+coffee", "application/jsx", Sprockets::CoffeeScriptProcessor)
           elsif Gem::Version.new(Sprockets::VERSION) >= Gem::Version.new("3.0.0")
             sprockets_env.register_engine(".jsx", React::JSX::Processor, mime_type: "application/javascript")
           else

test/dummy/app/assets/config/manifest.js

@@ -0,0 +1,4 @@
+// Sprockets 4 expects this file
+//
+//= link application.js
+//= link application.css

test/react_asset_test.rb

@@ -36,7 +36,15 @@ class ReactAssetTest < ActionDispatch::IntegrationTest
 
     test "the development version with addons is loaded" do
       asset = Rails.application.assets.find_asset('react')
-      assert asset.pathname.to_s.end_with?('development-with-addons/react.js')
+      path =
+        if asset.respond_to?(:pathname)
+          # Sprockets < 4
+          asset.pathname.to_s
+        else
+          # Sprockets 4+
+          asset.filename
+        end
+      assert path.end_with?('development-with-addons/react.js')
     end
 
     test "the production build is optimized for production" do