# WebUSB Testing WebUSB testing relies on the [WebUSB Testing API] which must be provided by browsers under test. In this test suite `resources/usb-helpers.js` detects and triggers the API to be loaded as needed. The Chromium implementation is provided by `../resources/chromium/webusb-test.js`. [WebUSB Testing API]: https://wicg.github.io/webusb/test/