Since the notifier must run on many versions of Rails, running its test suite is slightly different than you may be used to.
First execute the following command:
rake vendor_test_gems
# NOT: bundle exec rake vendor_test_gems
This command will download the various versions of Rails that the notifier must be tested against.
Then, to start the suite, run
rake
Note: do NOT use 'bundle exec rake'.
When developing the Airbrake Notifier, be sure to use the integration test against an existing project on staging before pushing to master.
./script/integration_test.rb <test project's api key> <staging server hostname>
./script/integration_test.rb <test project's api key> <staging server hostname> secure