One of our customers asked on Twitter, "How do I setup test splitting on CircleCI with Jest?"
This is briefly explain in the CircleCI docs, but I can see where it could be confusing.
I'm not the best writer, so I will let my code do the talking. This should serve as a good exercise in code documentation as well.
A portion of my package.json
"scripts": { "test": "jest", }, "jest": { "reporters": [ "default", "jest-junit" ] }, "jest-junit": { "outputDirectory": "test_results/junit" } My .circleci/config.json file
version: 2 jobs: build: parallelism: 3 docker: # I want to make sure I know exactly what version I'm using - image: circleci/node:10.15.3 working_directory: ~/repo steps: - checkout # Npm CI uses the package-lock.json file to ensure exact versions # This prevents changes and compromised upstream dependencies # from changing your project. It wipes the node_modules directory # so there is no need for a dependencies cache here. - run: npm ci # First we save the split test file names into an env # Then we pass that to jest - run: name: Run Jest tests using test splitting command: | TESTFILES=$(circleci tests glob "test/**/*.test.js" | circleci tests split --split-by=timings) npm test $TESTFILES - store_test_results: path: test_results - store_artifacts: path: test_results destination: test_results Hope this helps!
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