Example command to split tests

config.yml

# Step 1: Use the CircleCI CLI to split the tests with a globbing pattern to find test.js and exclude node_modules
# Step 2: Pipe list of tests in and split by timing data
# Step 3: Run tests as usual with the split test files being fed to the test runner

- run:
    name: Test application w/ timing data
    command: |
      TEST=$(circleci tests glob **/{*test.js,!node_modules} | circleci tests split --split-by=timings)
      yarn test $TEST