usbDevice_reset-manual.https.html

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  <head>

    <meta charset="utf-8">

    <title></title>

    <script src="/resources/testharness.js"></script>

    <script src="/resources/testharnessreport.js"></script>

    <script src="resources/manual.js"></script>

  </head>

  <body>

<p>

      These tests require a USB device to be connected.

    </p>

    <script>

      const kGetDescriptorRequest = 0x06;

      const kDeviceDescriptorType = 0x01;

      const kDeviceDescriptorLength = 18;

      manual_usb_test(async (t, device) => {

        await device.open();

        t.add_cleanup(async () => {

          await device.close();

});

        // This test exercises the behavior that the device remains open when it

        // is reset. If the device changes its properties too drastically when

        // reset it may appear to disconnect instead.

        await device.reset();

        // Read the device descriptor in order to validate that communication

        // with the device is still possible after a reset.

        const result = await device.controlTransferIn({

          requestType: 'standard',

          recipient: 'device',

          request: kGetDescriptorRequest,

          value: kDeviceDescriptorType << 8,

          index: 0,

        }, kDeviceDescriptorLength);

        assert_equals(result.status, 'ok', 'transfer status');

        assert_equals(

            result.data.byteLength, kDeviceDescriptorLength, 'transfer length');

      }, 'reset() does not disconnect the device');

    </script>

  </body>

</html>