bluetooth: mac: write characteristic 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 2d67661df490adae216d64759fd9681a3ef2db83..048810664eb089ec0a48671f8a9bd36691a6a904 100644
--- a/device/bluetooth/test/bluetooth_test_mac.mm
+++ b/device/bluetooth/test/bluetooth_test_mac.mm
@@ -309,6 +309,22 @@ void BluetoothTestMac::SimulateGattCharacteristicReadError(
   [characteristic_mock simulateReadWithValue:nil error:error];
 }
 
+void BluetoothTestMac::SimulateGattCharacteristicWrite(
+    BluetoothRemoteGattCharacteristic* characteristic) {
+  MockCBCharacteristic* characteristic_mock =
+      GetCBMockCharacteristic(characteristic);
+  [characteristic_mock simulateWriteWithError:nil];
+}
+
+void BluetoothTestMac::SimulateGattCharacteristicWriteError(
+    BluetoothRemoteGattCharacteristic* characteristic,
+    BluetoothRemoteGattService::GattErrorCode error_code) {
+  MockCBCharacteristic* characteristic_mock =
+      GetCBMockCharacteristic(characteristic);
+  NSError* error = BluetoothDeviceMac::GetNSErrorFromGattErrorCode(error_code);
+  [characteristic_mock simulateWriteWithError:error];
+}
+
 void BluetoothTestMac::SimulateGattCharacteristicRemoved(
     BluetoothRemoteGattService* service,
     BluetoothRemoteGattCharacteristic* characteristic) {
@@ -343,6 +359,12 @@ void BluetoothTest::OnFakeBluetoothCharacteristicReadValue() {
   gatt_read_characteristic_attempts_++;
 }
 
+void BluetoothTest::OnFakeBluetoothCharacteristicWriteValue(
+    std::vector<uint8_t> value) {
+  last_write_value_ = value;
+  gatt_write_characteristic_attempts_++;
+}
+
 MockCBPeripheral* BluetoothTestMac::GetMockCBPeripheral(
     BluetoothRemoteGattService* service) const {
   BluetoothDevice* device = service->GetDevice();