Docker-Compose in RubyMine 2017.3 Fails on Test::Unit Run Configurations with TeamCity error

I've set up a remote SDK and Test::Unit Run configuration in RubyMine but all I get is the following error in RubyMine's console:

Testing started at 6:05 AM ...
/usr/local/bin/ruby -e $$stdout.sync=true;$$stderr.sync=true;load($$0=ARGV.shift) -Itest /opt/.rubymine_helpers/rb/testing/runner/tunit_or_minitest_in_folder_runner.rb
/usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- teamcity/utils/runner_utils (LoadError)
 from /usr/local/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
 from /opt/.rubymine_helpers/rb/testing/runner/tunit_or_minitest_in_folder_runner.rb:25:in `<top (required)>'
 from -e:1:in `load'
 from -e:1:in `<main>'

Process finished with exit code 1

I use docker-compose installed by Docker for Mac and have no issues in Terminal running the following:

docker-compose run --rm web bundle install   
docker-compose build
docker-compose run --rm web bundle exec rake test

I've scoured the JetBrains docs on this and can't seem to find any hints as to what might be failing.  Any help would be much appreciated.