Create fake notification controller observer for further testing in presenter and ui_broker.

PiperOrigin-RevId: 516907638

fastpair/ui/fast_pair/fake_fast_pair_notification_controller_observer.h

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+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef THIRD_PARTY_NEARBY_FASTPAIR_UI_FAST_PAIR_FAKE_FAST_PAIR_NOTIFICATION_CONTROLLER_OBSERVER_H_
+#define THIRD_PARTY_NEARBY_FASTPAIR_UI_FAST_PAIR_FAKE_FAST_PAIR_NOTIFICATION_CONTROLLER_OBSERVER_H_
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+#include "fastpair/repository/device_metadata.h"
+#include "fastpair/ui/fast_pair/fast_pair_notification_controller.h"
+
+namespace nearby {
+namespace fastpair {
+class FakeFastPairNotificationControllerObserver
+    : public FastPairNotificationController::Observer {
+ public:
+  void OnUpdateDevice(DeviceMetadata& device) override {
+    device_metadata_name_list_.push_back(device.GetDetails().name());
+    on_update_device_count_++;
+  }
+
+  bool CheckDeviceMetadataListContainTestDevice(
+      const std::string& device_name) {
+    auto it = std::find(device_metadata_name_list_.begin(),
+                        device_metadata_name_list_.end(), device_name);
+    return it != device_metadata_name_list_.end();
+  }
+
+  int on_update_device_count() { return on_update_device_count_; }
+
+  std::vector<std::string> device_metadata_name_list() {
+    return device_metadata_name_list_;
+  }
+
+ private:
+  std::vector<std::string> device_metadata_name_list_;
+  int on_update_device_count_ = 0;
+};
+}  // namespace fastpair
+}  // namespace nearby
+
+#endif  // THIRD_PARTY_NEARBY_FASTPAIR_UI_FAST_PAIR_FAKE_FAST_PAIR_NOTIFICATION_CONTROLLER_OBSERVER_H_