Adding unit tests for BLE connection.

components/proximity_auth/ble/bluetooth_low_energy_characteristics_finder.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_PROXIMITY_AUTH_BLE_BLUETOOTH_LOW_ENERGY_CHARACTERISTICS_FINDER_H
 #define COMPONENTS_PROXIMITY_AUTH_BLE_BLUETOOTH_LOW_ENERGY_CHARACTERISTICS_FINDER_H
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 50 matching lines @@
 
  protected:
   // device::BluetoothAdapter::Observer:
   void GattDiscoveryCompleteForService(
       device::BluetoothAdapter* adapter,
       device::BluetoothGattService* service) override;
   void GattCharacteristicAdded(
       device::BluetoothAdapter* adapter,
       device::BluetoothGattCharacteristic* characteristic) override;
 
+  // For testing. Used to mock this class.
+  BluetoothLowEnergyCharacteristicsFinder();
+
  private:
   // Handles the discovery of a new characteristic.
   void HandleCharacteristicUpdate(
       device::BluetoothGattCharacteristic* characteristic);
 
   // Scans the remote chracteristics of the service with |uuid| in |device|
   // calling HandleCharacteristicUpdate() for each of them.
   void ScanRemoteCharacteristics(device::BluetoothDevice* device,
                                  const device::BluetoothUUID& uuid);
 
@@ skipping 24 matching lines @@
 
   // Called when there is an error.
   ErrorCallback error_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyCharacteristicsFinder);
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_BLE_BLUETOOTH_CHARACTERISTICS_FINDER_H