How to enable circleci parallel feature with cypress tests?

Build Environment
1

The circleci documentation is great but it doesnt mention anything about splitting cypress test cases across multiple machines with parallelism feature enabled.

I have cypress tests in my application and I have configured 4 parallel machines on circleci. But I can not figure out how to use circleci commands to split those test cases. I followed a blog post and tried the below code but didnt work. Any clue of how to make it both work?

steps:
        - run:
            name: Run cypress tests in Parallel
            command: |
              mkdir cypress/tmp
              mv $(circleci tests glob cypress/tests/**/*.spec.js | circleci tests split) cypress/tmp
              [ "$(ls -A cypress/tmp)" ] && npx cypress run --headless --browser electron

All 40 test cases started running across all 4 parallel machines instead of splitting the test cases. TIA

2

It should be a command line parameter, rather than moving them to a directory. We are using cypress-rails, and also yarn, but we pass in a cypress opts env variable, and that opts string is like --spec <path to test>, so I think you can just pass that to the command line you are using, like
export TEST_FILES="$(circleci tests glob cypress/tests/**/*.spec.js | circleci tests split)" && npm cypress run --headless --spec $TEST_FILES