Add CastPlatformClient for handling sender requests

This change adds a new class for handling request/response sequences
initiated by a Cast sender.  It will initially be used for app
availability requests and is modelled after Chrome's CastMessageHandler.

Bug: openscreen:60
Change-Id: Iba5ae0ee343e23a2c0214b5b17a2b59dca2cbe99
Reviewed-on: https://chromium-review.googlesource.com/c/openscreen/+/2044149
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/cast/sender/testing/test_helpers.h b/cast/sender/testing/test_helpers.h
new file mode 100644
index 00000000..c9a68c20
--- /dev/null
+++ b/cast/sender/testing/test_helpers.h
@@ -0,0 +1,43 @@
+// Copyright 2020 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.
+
+#ifndef CAST_SENDER_TESTING_TEST_HELPERS_H_
+#define CAST_SENDER_TESTING_TEST_HELPERS_H_
+
+#include <cstdint>
+#include <string>
+
+#include "cast/sender/channel/message_util.h"
+
+namespace cast {
+namespace channel {
+class CastMessage;
+}  // namespace channel
+}  // namespace cast
+
+namespace openscreen {
+namespace cast {
+
+void VerifyAppAvailabilityRequest(const ::cast::channel::CastMessage& message,
+                                  const std::string& expected_app_id,
+                                  int* request_id_out,
+                                  std::string* sender_id_out);
+void VerifyAppAvailabilityRequest(const ::cast::channel::CastMessage& message,
+                                  std::string* app_id_out,
+                                  int* request_id_out,
+                                  std::string* sender_id_out);
+
+::cast::channel::CastMessage CreateAppAvailableResponseChecked(
+    int request_id,
+    const std::string& sender_id,
+    const std::string& app_id);
+::cast::channel::CastMessage CreateAppUnavailableResponseChecked(
+    int request_id,
+    const std::string& sender_id,
+    const std::string& app_id);
+
+}  // namespace cast
+}  // namespace openscreen
+
+#endif  // CAST_SENDER_TESTING_TEST_HELPERS_H_