Reenable unit tests

Author: Winter Dong

docker/unit_tests.sh

@@ -63,6 +63,6 @@ RAKE_VERBOSE=true mispipe "bundle exec rake install" "ts '[%Y-%m-%d %H:%M:%S]'"
 RAKE_VERBOSE=true mispipe "bundle exec rake build --trace" "ts '[%Y-%m-%d %H:%M:%S]'"
 
 # unit tests
-# bundle exec rake circle:run_tests --trace
+bundle exec rake circle:run_tests --trace
 
 mispipe "echo 'Ending timestamp'" ts