multi-cypress

Roll multiple spec bundles and test in parallel using Cypress and GitLab

Goals

This is a built utility for making and running Cypress tests on a GitLab instance.

• Generate single output spec files from multiple input files using ES6 module syntax (import and export statements)
• Create a GitLab definition file that allows running multiple spec files in parallel.

You can see an example in action at gitlab where multiple testing jobs are built and executed in parallel.

Install and use

Imagine you have multiple spec files in tests folder. Each spec file can include other files using import statements. Install this tool npm i -D multi-cypress and use it to build the spec bundles and .gitlab-ci.yml file.

{
  "name": "my-module",
  "scripts": {
    "build": "multi-cypress"
  }
}

You can watch the input spec files and keep rebuilding the bundles and .gitlab-ci.yml file on changes.

{
  "name": "my-module",
  "scripts": {
    "build": "multi-cypress -w"
  }
}

Custom configuration

You can define input spec file pattern and output folder inside package.json. See test/package.json for an example

{
  "name": "my-module",
  "config": {
    "multi-cypress": {
      "specs": "src/*-spec.js",
      "destination": "output"
    }
  }
}

Output .gitlab-ci.yml file

The output file will have single build job and multiple test jobs (single test job per output spec file). See the generated test example test/.gitlab-ci.yml. You can specify the base docker image to use (which should probably include everything Cypress needs to run). By default, it sets the base image to bahmutov/cypress-image which includes everything Cypress needs to run plus Node 6.

{
  "name": "my-module",
  "config": {
    "multi-cypress": {
      "specs": "src/*-spec.js",
      "docker": "my-company-hub/test/cypress-base"
    }
  }
}

You can disable .gitlab-ci.yml file generation using a config option

{
  "name": "my-module",
  "config": {
    "multi-cypress": {
      "gitlab": false
    }
  }
}

Custom test commands

By default, each GitLab test job only runs a single default command

cypress ci --spec "${outputFolder}/$CI_BUILD_NAME.js"

where outputFolder is either the default folder or the one specified in the package.json, and CI_BUILD_NAME is the environment variable set by the GitLab CI. You can set your own test, before and after commands, for example to specify the json reporter we could do

"config": {
  "multi-cypress": {
    "destination": "cypress/integration",
    "script": [
      "cypress ci --spec cypress/integration/$CI_BUILD_NAME.js --reporter json",
      "echo test finished successfully"
    ],
    "before_script": [
      "mkdir -p dist || true",
      "echo Prep done"
    ],
    "after_script": [
      "echo All done!"
    ]
  }
}

Note that in this case you need to form the full test filename yourself, without relying on macro expansion ${outputFolder}. See test4/package.json and test4/.gitlab-ci.yml for examples.

Custom build command

You can also customize the build script commands using build_script list. See test5/package.json and the output test5/.gitlab-ci.yml files.

Support files

This project does NOT copy any support files. If you have a dependency with custom commands for example, you need to copy it separately. For example

{
  "scripts": {
    "build": "multi-cypress && npm run copy-commands",
    "copy-commands": "cp node_modules/my-utils/commands.js cypress/support"
  }
}

This will copy file commands.js from installed dependency my-utils into Cypress support folder.

Debugging

To print debug messages during the build, start the tool with environment variable

DEBUG=multi ...

The generated GitLab CI also collects the screenshots (and videos) collected by Cypress as artifacts

.job_template: &e2e_test_definition
  artifacts:
    when: on_failure
    expire_in: 1 week
    paths:
    - cypress/screenshots/
    - cypress/videos/
  script:
    - cypress ci --spec "output/$CI_BUILD_NAME.js"

This should help debug test problems, because Cypress should save the screenshots on failure when running in the CI mode.

Misc

The rollup config includes rollup-plugin-node-resolve plugin by default to allow importing ES6 modules.

Small print

Author: Kensho, Gleb Bahmutov <gleb@kensho.com> © 2016

License: MIT - do anything with the code, but don't blame me if it does not work.

Support: if you find any problems with this module, email / tweet / open issue on Github

MIT License

Copyright (c) 2016 Kensho

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.