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:

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

module.exports = plugin;
`

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

`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)