+ whenever you edit files. Configuration in `rollup.config.js`.
+
+## Testing
+
+The `test/` setup uses [Mocha](https://mochajs.org/) to run tests. Tests use [Puppeteer](https://pptr.dev/) to control a Google Chrome headless browser and evaluate with [Assert](https://nodejs.org/api/assert.html).
+
+
+* Run integration test suite (configuration in `.mocharc.js`)
+
+ ```
+ yarn test
+ ```
+
+* Run syntax linter (configuration in `.eslint.js`)
+
+ ```
+ yarn lint
+ ```