[CrOS Tether] Create proto_test_util.cc/h and move CreateTestDeviceStatus() there.

chromeos/components/tether/proto_test_util.cc

+// Copyright 2017 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 "chromeos/components/tether/proto_test_util.h"
+
+namespace chromeos {
+
+namespace tether {
+
+DeviceStatus CreateTestDeviceStatus(const std::string& cell_provider_name,
+                                    int battery_percentage,
+                                    int connection_strength) {
+  // TODO(khorimoto): Once a ConnectedWifiSsid field is added as a property of
+  // Tether networks, give an option to pass a parameter for that field as well.
+  WifiStatus wifi_status;
+  wifi_status.set_status_code(
+      WifiStatus_StatusCode::WifiStatus_StatusCode_CONNECTED);
+  wifi_status.set_ssid("WifiSsid");
+
+  DeviceStatus device_status;
+  if (battery_percentage != proto_test_util::kDoNotSetIntField) {
+    device_status.set_battery_percentage(battery_percentage);
+  }
+  if (cell_provider_name != proto_test_util::kDoNotSetStringField) {
+    device_status.set_cell_provider(cell_provider_name);
+  }
+  if (connection_strength != proto_test_util::kDoNotSetIntField) {
+    device_status.set_connection_strength(connection_strength);
+  }
+
+  device_status.mutable_wifi_status()->CopyFrom(wifi_status);
+
+  return device_status;
+}
+
+DeviceStatus CreateDeviceStatusWithFakeFields() {
+  return CreateTestDeviceStatus("Google Fi", 75 /* battery_percentage */,
+                                4 /* connection_strength */);
+}
+
+}  // namespace tether
+
+}  // namespace chromeos