rake assets:precompile executes in production environment as default …

…if RAILS_ENV was not provided

actionpack/lib/sprockets/assets.rake

@@ -3,9 +3,9 @@ namespace :assets do
   task :precompile do
     # We need to do this dance because RAILS_GROUPS is used
     # too early in the boot process and changing here is already too late.
-    if ENV["RAILS_GROUPS"].to_s.empty?
-      ENV["RAILS_GROUPS"] = "assets"
-      ENV["RAILS_ENV"]  ||= "production"
+    if ENV["RAILS_GROUPS"].to_s.empty? || ENV["RAILS_ENV"].to_s.empty?
+      ENV["RAILS_GROUPS"] ||= "assets"
+      ENV["RAILS_ENV"]    ||= "production"
       Kernel.exec $0, *ARGV
     else
       Rake::Task["environment"].invoke
@@ -24,4 +24,4 @@ namespace :assets do
     public_asset_path = Rails.public_path + assets.prefix
     rm_rf public_asset_path, :secure => true
   end
-end
+end

railties/test/application/assets_test.rb

@@ -46,28 +46,40 @@ def app
       assert defined?(Uglifier)
     end
 
-    test "precompile creates the file and gives it the original asset's content" do
+    test "precompile creates the filem, gives it the original asset's content and run in production as default" do
       app_file "app/assets/javascripts/application.js", "alert();"
       app_file "app/assets/javascripts/foo/application.js", "alert();"
 
+      ENV["RAILS_ENV"] = nil
       capture(:stdout) do
         Dir.chdir(app_path){ `bundle exec rake assets:precompile` }
       end
-      files = Dir["#{app_path}/public/assets/application-*.js"]
-      files << Dir["#{app_path}/public/assets/foo/application-*.js"].first
+      files = Dir["#{app_path}/public/assets/application-b29a188b3d9c74ef7cbb7ddf9e99f953.js"]
+      files << Dir["#{app_path}/public/assets/foo/application-b29a188b3d9c74ef7cbb7ddf9e99f953.js"].first
       files.each do |file|
         assert_not_nil file, "Expected application.js asset to be generated, but none found"
-        assert_equal "alert();\n", File.read(file)
+        assert_equal "alert()", File.read(file)
       end
     end
 
-    test "precompile appends the md5 hash to files referenced with asset_path" do
+    test "precompile appends the md5 hash to files referenced with asset_path and run in the provided RAILS_ENV" do
       app_file "app/assets/stylesheets/application.css.erb", "<%= asset_path('rails.png') %>"
 
+      # capture(:stdout) do
+        Dir.chdir(app_path){ `bundle exec rake assets:precompile RAILS_ENV=test` }
+      # end
+      file = Dir["#{app_path}/public/assets/application-4bd8b7059c5336ec7ad515c9dbd59974.css"].first
+      assert_match /\/assets\/rails-([0-z]+)\.png/, File.read(file)
+    end
+
+    test "precompile appends the md5 hash to files referenced with asset_path and run in production as default even using RAILS_GROUPS=assets" do
+      app_file "app/assets/stylesheets/application.css.erb", "<%= asset_path('rails.png') %>"
+
+      ENV["RAILS_ENV"] = nil
       capture(:stdout) do
-        Dir.chdir(app_path){ `bundle exec rake assets:precompile` }
+        Dir.chdir(app_path){ `bundle exec rake assets:precompile RAILS_GROUPS=assets` }
       end
-      file = Dir["#{app_path}/public/assets/application-*.css"].first
+      file = Dir["#{app_path}/public/assets/application-8d301a938f1abfd789bbec87ed1ef770.css"].first
       assert_match /\/assets\/rails-([0-z]+)\.png/, File.read(file)
     end