Split Tests in Cypress

Splits test files in Cypress and ensures all parallel jobs finish work at a similar time.

Before

| | Job | Time | | --------------------------- | :-: | :--------: | | =========================== | 1 | 46 minutes | | ======== | 2 | 13 minutes | | ============ | 3 | 19 minutes |

After

| | Job | Time | | ------------- | :-: | :--------: | | ============= | 1 | 26 minutes | | ============= | 2 | 26 minutes | | ============= | 3 | 26 minutes |

Setup

Install @split-tests/cypress package:

npm install --save-dev @split-tests/cypress
yarn add -D @split-tests/cypress

In cypress/plugins/index.js:

const plugin = require("@split-tests/cypress");

module.exports = plugin;

Use JUnit to report run times of the tests (in cypress.json):

{
  "reporter": "junit",
  "reporterOptions": {
    "mochaFile": "reports/junit-[hash].xml"
  }
};

Usage

Jobs are calculated at run time:

$ CYPRESS_JOBS_TOTAL=3 CYPRESS_JOBS_INDEX=0 jest

• CYPRESS_JOBS_TOTAL - total number of jobs
• CYPRESS_JOBS_INDEX - index number of the job (starts with 0)