Monkey patch Minitest::Assertion#location... ## in test/test_helper.rb class Minitest::Assertion alias_method :old_location, :location def location old_location.sub("#{Rails.root.to_s}/", '') end end ...to dump the relative path on failure... 2) Failure: ExampleTest#test_for_failure [test/models/example_test.rb:9]: Expected: true Actual: false ...instead of the full path. 2) Failure: ExampleTest#test_for_failure [/Users/eric/Projects/obscenely_long_example_app_name/test/models/example_test.rb:9]: Expected: true Actual: false