Implement WebBluetooth descriptor.readValue()

third_party/WebKit/LayoutTests/bluetooth/script-tests/descriptor/io-op-device-disconnects-during-success.js

+'use strict';
+promise_test(
+    () => {
+      let val = new Uint8Array([1]);
+      return setBluetoothFakeAdapter('DisconnectingHealthThermometerAdapter')
+          .then(() => requestDeviceWithKeyDown({
+                  filters: [{services: ['health_thermometer']}],
+                  optionalServices: [request_disconnection_service_uuid]
+                }))
+          .then(device => device.gatt.connect())
+          .then(gattServer => {
+            return gattServer.getPrimaryService('health_thermometer')
+                .then(ht => ht.getCharacteristic('measurement_interval'))
+                .then(
+                    characteristic =>
+                        characteristic.getDescriptor(user_description.name))
+                .then(d => user_description = d)
+                .then(() => get_request_disconnection(gattServer))
+                .then(requestDisconnection => {
+                  requestDisconnection();
+                  return assert_promise_rejects_with_message(
+                      user_description.CALLS([readValue()]),
+                      new DOMException(
+                          'GATT Server disconnected while performing a GATT operation.',
+                          'NetworkError'));
+                });
+          });
+    },
+    'Device disconnects during a FUNCTION_NAME call that succeeds. ' +
+        'Reject with NetworkError.');