New manifests are under .sprockets-manifest*

Author: josh

test/test_task.rb

@@ -76,7 +76,7 @@ def test_precompile_without_manifest
     @rake['assets:precompile'].invoke
 
     assert @environment_ran
-    assert Dir["#{@dir}/manifest-*.json"].first
+    assert Dir["#{@dir}/.sprockets-manifest-*.json"].first || Dir["#{@dir}/manifest-*.json"].first
     assert File.exist?("#{@dir}/#{digest_path}")
   end