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

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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