In this example, we are using Rollup to bundle k6 tests and an internal library for demo purposes.

Content

Test project

The tests folder is our testing project. It includes all tests, test dependencies, and project dependencies like Rollup. Its rollup.config.js is set up to:

• Bundle up test modules located in node_modules.
• Polyfill ES+ features that k6 doesn't natively support.

Shared library

The test-commons folder contains a library that's imported in the test project. It's rollup.config.js bundles the library as ES modules.

This project includes a GH action that bundles and releases the library as assets in the project release. Then, you can import this version from the k6 tests as remote modules, just like in import-remote-test.js.

import { WorkloadConfig, sayHello } from 'https://github.com/grafana/k6-rollup-example/releases/download/v0.0.1/index.js';

Alternatively, test-commons could be distributed as a npm-based project and configured as a dependency like in tests/package.json. Then, you can import it as in import-npm-test.js.

import { WorkloadConfig, sayHello } from 'test-commons';

Installation

First, ensure you've got k6 installed. Then, set up the dependencies of the testing project:

cd tests
npm install

Usage

To confirm the usage of remote modules, visit import-remote-test.js and run the test.

However, attempting to run the tests in samples will fail because:

• k6 does not know how to resolve the test-commons module.
• k6 does not recognize some ES+ features like the optional chaining ( ?. ) operator.

To address this, we'll use Rollup to bundle the dependency and polyfill ES+ features.

cd tests

## To bundle all the tests
npm run rollup

# Or just one test
npm run rollup -- --input samples/babel/optional-chaining-test.js

You should see rollup bundling tests into the dist folder, like this:

samples/import-npm-test.js → dist...
created dist in 76ms

...

Now we're all set! Check out the dist folder. We can now run the tests as usual:

k6 run dist/optional-chaining-test.js