Done!

Ding!
The test_...rb did give me an error:

ruby clone_war_test.rb                                             ▸▸▸▸▸▸▸▸▸▸
Run options: --seed 35488

# Running tests:

E

Finished tests in 0.000673s, 1485.8841 tests/s, 0.0000 assertions/s.

  1) Error:
test_should_not_be_at_war(TestCloneWar):
NameError: uninitialized constant TestCloneWar::CloneWar
    clone_war_test.rb:5:in `test_should_not_be_at_war'

1 tests, 0 assertions, 0 failures, 1 errors, 0 skips

However, bundle exec rake ran fine.