+gem 'rails-observers'
+
+gem 'rails-perftest'
+gem 'rails-controller-testing'
+
+gem 'mini_portile2', '~> 2.8', '>= 2.8.1'
+
+# arvados-google-api-client and googleauth depend on signet, but
+# signet 0.12 is incompatible with ruby 2.3.
+gem 'signet', '< 0.12'
+