cypress-parallel

Reduce up to 40% your Cypress suite execution time parallelizing the test run on the same machine.

cypress	cypress-parallel

Run your Cypress tests in parallel (locally)

How it works

🔍 - Search for existing Cypress tests
📄 - Read (if exists) a weight file
⚖️ - Split spec files into different threads
⚙️ - For each thread it runs the Cypress command you've passed as argument
📈 - Wait for all threads to finish and collects the result in a single report

How to use

Install

npm i cypress-parallel -D

or

yarn add cypress-parallel -D

Add a new script

In your package.json add a new script:

"scripts" :{
  ...
  "cy:run": "cypress run", // It can be any cypress command with any argument
  "cy:parallel" : "cypress-parallel -s cy:run -t 2 -d '<your-cypress-specs-folder>' -a '\"<your-cypress-cmd-args>\"'"
  ...
}

With Arguments

Sample:

-a '\"--config baseUrl=http://localhost:3000\"'

Launch the new script

npm run cy:parallel

or

Run with npx (no package installation needed)

npx cy:parallel -s cy:run -t 2 -d '<your-cypress-specs-folder>' -a '"<your-cypress-cmd-args>"'

Passing Specs

cypress-parallel -s cy:run -t 2 -a '\"<your-cypress-cmd-args>\"' --spec path/to/spec1.spec.js path/to/spec2.spec.js

Scripts options

Option	Alias	Description	Type
--help		Show help
--version		Show version number
--script	-s	Your npm Cypress command	string
--args	-a	Your npm Cypress command arguments	string
--threads	-t	Number of threads	number
--specsDir	-d	Cypress specs directory	string
--spec		Cypress spec file paths	string
--weightsJson	-w	Parallel weights json file	string
--reporter	-r	Reporter to pass to Cypress.	string
--reporterOptions	-o	Reporter options	string
--reporterModulePath	-n	Specify the reporter module path	string
--bail	-b	Exit on first failing thread	string
--verbose	-v	Some additional logging	string
--strictMode	-m	Add stricter checks after running the tests	boolean

NB: If you use cypress-cucumber-preprocesor, please disable the strictMode to avoid possible errors:

"scripts" :{
  ...
  "cy:parallel" : "cypress-parallel -s cy:run -t 4 -m false"
  ...
}

NB: If your cypress-multi-reporters module is not found on the same level as your Cypress suite (e.g. in a mono-repo) then you can specify the module directory for Cypress to search within.

"scripts" :{
  ...
  "cy:parallel" : "cypress-parallel -s cy:run -t 4 -n .../../../node_modules/cypress-multi-reporters"
  ...
}

Env variables

CYPRESS_THREAD

You can get the current thread index by reading the CYPRESS_THREAD variable.

 const threadIndex = process.env.CYPRESS_THREAD;
 // return 1, 2, 3, 4, ...

Contributors

Looking for contributors.

License

This project is licensed under the MIT license. See LICENSE.