bluetooth: mac: Initial BluetoothRemoteGattCharacteristicMac implementation

device/bluetooth/test/bluetooth_test_mac.mm

Index: device/bluetooth/test/bluetooth_test_mac.mm
diff --git a/device/bluetooth/test/bluetooth_test_mac.mm b/device/bluetooth/test/bluetooth_test_mac.mm
index 73527a2bbafe639696dab33a984c6f43d2ece5e2..7f59b54f8dfde7560dc25e7eaa5d05a1ff23e6ac 100644
--- a/device/bluetooth/test/bluetooth_test_mac.mm
+++ b/device/bluetooth/test/bluetooth_test_mac.mm
@@ -12,6 +12,7 @@
 #include "device/bluetooth/bluetooth_adapter_mac.h"
 #include "device/bluetooth/bluetooth_remote_gatt_service_mac.h"
 #include "device/bluetooth/test/mock_bluetooth_cbperipheral_mac.h"
+#include "device/bluetooth/test/mock_bluetooth_cbservice_mac.h"
 #include "device/bluetooth/test/mock_bluetooth_central_manager_mac.h"
 #include "device/bluetooth/test/test_bluetooth_adapter_observer.h"
 #include "third_party/ocmock/OCMock/OCMock.h"
@@ -21,6 +22,18 @@
 using base::mac::ObjCCast;
 using base::scoped_nsobject;
 
+namespace {
+
+static void DidDiscoverServices(MockCBPeripheral* peripheral_mock) {
+  [peripheral_mock didDiscoverServicesWithError:nil];
+  // BluetoothLowEnergyDeviceMac is expected to call
+  // -[CBPeripheral discoverCharacteristics:forService:] for each services,
+  // so -[<CBPeripheralDelegate peripheral:didDiscoverCharacteristicsForService:
+  // error:] needs to be called
+  [peripheral_mock didDiscoverCharactericsForAllServices];
+}
+}  // namespace
+
 namespace device {
 
 // This class hides Objective-C from bluetooth_test_mac.h.
@@ -235,7 +248,7 @@ void BluetoothTestMac::SimulateGattServicesDiscovered(
     [services addObject:cb_service_uuid];
   }
   [peripheral_mock addServices:services];
-  [peripheral_mock didDiscoverServicesWithError:nil];
+  DidDiscoverServices(peripheral_mock);
 }
 
 void BluetoothTestMac::SimulateGattServiceRemoved(
@@ -250,7 +263,30 @@ void BluetoothTestMac::SimulateGattServiceRemoved(
   CBPeripheral* peripheral = device_mac->GetPeripheral();
   MockCBPeripheral* peripheral_mock = ObjCCast<MockCBPeripheral>(peripheral);
   [peripheral_mock removeService:mac_gatt_service->GetService()];
-  [peripheral_mock didDiscoverServicesWithError:nil];
+  // After -[MockCBPeripheral removeService:], BluetoothLowEnergyDeviceMac is
+  // expected to call -[CBPeripheral discoverServices:]
+  DidDiscoverServices(peripheral_mock);
+}
+
+void BluetoothTestMac::SimulateGattCharacteristic(
+    BluetoothRemoteGattService* service,
+    const std::string& uuid,
+    int properties) {
+  BluetoothRemoteGattServiceMac* mac_gatt_service =
+      static_cast<BluetoothRemoteGattServiceMac*>(service);
+  CBService* cb_service = mac_gatt_service->GetService();
+  MockCBService* service_mock = ObjCCast<MockCBService>(cb_service);
+  CBUUID* cb_uuid = [CBUUID UUIDWithString:@(uuid.c_str())];
+  [service_mock addCharacteristicWithUUID:cb_uuid properties:properties];
+  BluetoothDevice* device = service->GetDevice();
+  BluetoothLowEnergyDeviceMac* device_mac =
+      static_cast<BluetoothLowEnergyDeviceMac*>(device);
+  CBPeripheral* cb_peripheral = device_mac->GetPeripheral();
+  MockCBPeripheral* peripheral_mock = ObjCCast<MockCBPeripheral>(cb_peripheral);
+  [peripheral_mock didModifyServices:@[]];
+  // After -[MockCBPeripheral didModifyServices:], BluetoothLowEnergyDeviceMac
+  // is expected to call -[CBPeripheral discoverServices:]
+  DidDiscoverServices(peripheral_mock);
 }
 
 void BluetoothTestMac::OnFakeBluetoothDeviceConnectGattCalled() {