Fix CircleCI (#157)

* Drop Ruby 3.1 from CI

* Fix CircleCI report dir

.circleci/config.yml

@@ -53,7 +53,7 @@ jobs:
       - checkout
       - bundle_install:
           version: << parameters.version >>
-      - run: bundle exec rake test TESTOPTS="--ci-dir=./reports"
+      - run: bundle exec rake test
       - store_test_results:
           path: ./reports
 
@@ -65,14 +65,14 @@ workflows:
       - test:
           matrix:
             parameters:
-              version: ["3.1.6", "3.2.6", "3.3.6", "3.4.1"]
+              version: ["3.2.6", "3.3.6", "3.4.1"]
   cron-workflow:
     jobs:
       - rubocop
       - test:
           matrix:
             parameters:
-              version: ["3.1.6", "3.2.6", "3.3.6", "3.4.1"]
+              version: ["3.2.6", "3.3.6", "3.4.1"]
     triggers:
       - schedule:
           cron: "0 13 * * 6"

test/support/circleci.rb

@@ -1,2 +1,6 @@
 # Generate XML test reports that can be parsed by CircleCI
-require 'minitest/ci' if ENV['CIRCLECI']
+if ENV['CIRCLECI']
+  require 'minitest/ci'
+
+  Minitest::Ci.report_dir = './reports'
+end