MediaPerceptionPrivate API impl and testing.

extensions/browser/api/media_perception_private/media_perception_private_apitest.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 "base/command_line.h"
+#include "chrome/browser/extensions/extension_apitest.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/fake_media_analytics_client.h"
+#include "chromeos/dbus/media_analytics_client.h"
+#include "extensions/browser/api/media_perception_private/media_perception_private_api.h"
+#include "extensions/common/switches.h"
+#include "extensions/test/extension_test_message_listener.h"
+
+namespace extensions {
+
+class MediaPerceptionPrivateApiTest : public ExtensionApiTest {
+ public:
+  MediaPerceptionPrivateApiTest() {}
+
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    ExtensionApiTest::SetUpCommandLine(command_line);
+    // Whitelist of the extension ID of the test extension.
+    command_line->AppendSwitchASCII(
+        extensions::switches::kWhitelistedExtensionID,
+        "epcifkihnkjgphfkloaaleeakhpmgdmn");
+  }
+
+  void InitializeDbusClient() {

[tbarzic, 2017/05/11 00:38:27]

This is not really initializing D bus client, maybe rename this to
FakeMEdiaAnalyticsClient* GetMediaAnalyticsClient()

[Luke Sorenson, 2017/05/11 23:58:00]

Done.

+    dbus_client_ = reinterpret_cast<chromeos::FakeMediaAnalyticsClient*>(

[tbarzic, 2017/05/11 00:38:27]

Can you check if you can use  DBusThreadManager::GetSetterForTesting to inject a
fake media analytics client?

[Luke Sorenson, 2017/05/11 23:57:59]

Done.

+        chromeos::DBusThreadManager::Get()->GetMediaAnalyticsClient());
+  }
+
+  ~MediaPerceptionPrivateApiTest() override {}

[tbarzic, 2017/05/11 00:38:27]

move this after ctor;
use = default where possible

[Luke Sorenson, 2017/05/11 23:57:59]

Done.

+
+  chromeos::FakeMediaAnalyticsClient* dbus_client_;

[tbarzic, 2017/05/11 00:38:27]

DISALLOW_COPY_AND_ASSIGN

[Luke Sorenson, 2017/05/11 23:57:59]

Done.

+};
+
+// Verify that we can set and get mediaPerception system state.
+IN_PROC_BROWSER_TEST_F(MediaPerceptionPrivateApiTest, State) {
+  ASSERT_TRUE(RunPlatformAppTest("media_perception_private/state")) << message_;
+}
+
+// Verify that we can request Diagnostics.
+IN_PROC_BROWSER_TEST_F(MediaPerceptionPrivateApiTest, GetDiagnostics) {
+  InitializeDbusClient();
+  // Allows us to validate that the right data comes through the code path.
+  dbus_client_->SetFrameId(1);
+
+  ASSERT_TRUE(RunPlatformAppTest("media_perception_private/diagnostics"))
+      << message_;
+}
+
+// Verify that we can listen for MediaPerceptionDetection signals and handle
+// them.
+IN_PROC_BROWSER_TEST_F(MediaPerceptionPrivateApiTest, MediaPerception) {
+  ExtensionTestMessageListener handler_registered_listener(
+      "mediaPerceptionListenerSet", false);
+  ASSERT_TRUE(LoadExtension(
+      test_data_dir_.AppendASCII("media_perception_private/media_perception")))
+      << message_;
+  ASSERT_TRUE(handler_registered_listener.WaitUntilSatisfied());
+
+  InitializeDbusClient();
+  // Allows us to validate that the right data comes through the code path.
+  dbus_client_->SetFrameId(1);

[tbarzic, 2017/05/11 00:38:27]

do you need this for this test?

[Luke Sorenson, 2017/05/11 23:57:59]

Done.

+  dbus_client_->FireMediaPerceptionEvent();
+}
+
+}  // namespace extensions