After making the change to use `RSpec.configure`, the tests all passed except the one involving `SharedContext`, where it didn't find `its` after the `extend SharedContext`.  Looking at https://github.com/rspec/rspec-core/blob/3091424962852fd88890fe9a9359e863400caf12/lib/rspec/core/shared_context.rb, it didn't look like `SharedContext` included the configuration extends/includes.  Any suggestions?