I think that this is an issue with Rails 4. I was able to find a workaround here: https://github.com/nicksieger/ci_reporter/issues/106
pbendersky commented 6 months ago
...include minitest-reporters in your Gemfile and add the following to test_helper.rb.
test_helper.rb:
require 'minitest/reporters'
MiniTest::Reporters.use! [MiniTest::Reporters::DefaultReporter.new,
MiniTest::Reporters::JUnitReporter.new]