bluetooth: android: Initial basic Descriptors implementation.

device/bluetooth/bluetooth_gatt_service_unittest.cc

 // 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.
 
 #include "device/bluetooth/bluetooth_gatt_service.h"
 
 #include "build/build_config.h"
 #include "device/bluetooth/bluetooth_gatt_characteristic.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 119 matching lines @@
   std::string char_id3 = service->GetCharacteristics()[2]->GetIdentifier();
   std::string char_id4 = service->GetCharacteristics()[3]->GetIdentifier();
   BluetoothUUID char_uuid1 = service->GetCharacteristics()[0]->GetUUID();
   BluetoothUUID char_uuid2 = service->GetCharacteristics()[1]->GetUUID();
   BluetoothUUID char_uuid3 = service->GetCharacteristics()[2]->GetUUID();
   BluetoothUUID char_uuid4 = service->GetCharacteristics()[3]->GetUUID();
   EXPECT_EQ(char_uuid1, service->GetCharacteristic(char_id1)->GetUUID());
   EXPECT_EQ(char_uuid2, service->GetCharacteristic(char_id2)->GetUUID());
   EXPECT_EQ(char_uuid3, service->GetCharacteristic(char_id3)->GetUUID());
   EXPECT_EQ(char_uuid4, service->GetCharacteristic(char_id4)->GetUUID());
+
+  // GetCharacteristics & GetCharacteristic return the same object for the same
+  // ID:
+  EXPECT_EQ(service->GetCharacteristics()[0],
+            service->GetCharacteristic(char_id1));
+  EXPECT_EQ(service->GetCharacteristic(char_id1),
+            service->GetCharacteristic(char_id1));
 }
 #endif  // defined(OS_ANDROID)
 
 }  // namespace device