bluetooth: Introduce SetLowEnergyAvailableForTesting

device/bluetooth/bluetooth_adapter_factory.h

 // Copyright (c) 2012 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 DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_H_
 
 #include "base/callback.h"
+#include "base/lazy_instance.h"
 #include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_export.h"
 
 namespace device {
 
 // A factory class for building a Bluetooth adapter on platforms where Bluetooth
 // is available.
 class DEVICE_BLUETOOTH_EXPORT BluetoothAdapterFactory {
  public:
   typedef base::Callback<void(scoped_refptr<BluetoothAdapter> adapter)>
       AdapterCallback;
 
+  ~BluetoothAdapterFactory();
+
+  static BluetoothAdapterFactory& Get();
+
   // Returns true if the Bluetooth adapter is available for the current
   // platform.
   static bool IsBluetoothAdapterAvailable();
 
   // Returns true if Bluetooth Low Energy is available for the current
   // platform.
-  static bool IsLowEnergyAvailable();
+  bool IsLowEnergyAvailable();
 
   // Returns the shared instance of the default adapter, creating and
   // initializing it if necessary. |callback| is called with the adapter
   // instance passed only once the adapter is fully initialized and ready to
   // use.
   static void GetAdapter(const AdapterCallback& callback);
 
 #if defined(OS_CHROMEOS) || defined(OS_LINUX)
   // Calls |BluetoothAdapter::Shutdown| on the adapter if
   // present.
   static void Shutdown();
 #endif
 
   // Sets the shared instance of the default adapter for testing purposes only,
   // no reference is retained after completion of the call, removing the last
   // reference will reset the factory.
   static void SetAdapterForTesting(scoped_refptr<BluetoothAdapter> adapter);
 
   // Returns true iff the implementation has a (non-NULL) shared instance of the
   // adapter. Exposed for testing.
   static bool HasSharedInstanceForTesting();
+
+  // Sets the return value for IsLowEnergyAvailable() to |available|.
+  void SetLowEnergyAvailableForTesting(bool available);
+
+ private:
+  // Friend LazyInstance to permit access to private constructor.
+  friend base::LazyInstanceTraitsBase<BluetoothAdapterFactory>;
+
+  BluetoothAdapterFactory();
+
+  base::Optional<bool> le_available_for_testing_;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_FACTORY_H_