chrome/browser/policy/audio_output_allowed_browsertest.cc

// 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.

#include "base/values.h"
#include "chrome/browser/policy/policy_test_utils.h"
#include "chromeos/audio/cras_audio_handler.h"
#include "components/policy/core/common/policy_map.h"
#include "components/policy/core/common/policy_types.h"
#include "components/policy/policy_constants.h"
#include "content/public/test/browser_test.h"

namespace policy {

namespace {

class TestAudioObserver : public chromeos::CrasAudioHandler::AudioObserver {
 public:
  TestAudioObserver() : output_mute_changed_count_(0) {}
  ~TestAudioObserver() override {}

  TestAudioObserver(const TestAudioObserver&) = delete;
  TestAudioObserver& operator=(const TestAudioObserver&) = delete;

  int output_mute_changed_count() const { return output_mute_changed_count_; }

 protected:
  // chromeos::CrasAudioHandler::AudioObserver overrides.
  void OnOutputMuteChanged(bool /* mute_on */) override {
    ++output_mute_changed_count_;
  }

 private:
  int output_mute_changed_count_;
};

}  // namespace

IN_PROC_BROWSER_TEST_F(PolicyTest, DisableAudioOutput) {
  // Set up the mock observer.
  chromeos::CrasAudioHandler* audio_handler = chromeos::CrasAudioHandler::Get();
  std::unique_ptr<TestAudioObserver> test_observer(new TestAudioObserver);
  audio_handler->AddAudioObserver(test_observer.get());

  bool prior_state = audio_handler->IsOutputMuted();
  // Make sure the audio is not muted and then toggle the policy and observe
  // if the output mute changed event is fired.
  audio_handler->SetOutputMute(false);
  EXPECT_FALSE(audio_handler->IsOutputMuted());
  EXPECT_EQ(1, test_observer->output_mute_changed_count());
  PolicyMap policies;
  policies.Set(key::kAudioOutputAllowed, POLICY_LEVEL_MANDATORY,
               POLICY_SCOPE_USER, POLICY_SOURCE_CLOUD, base::Value(false),
               nullptr);
  UpdateProviderPolicy(policies);
  EXPECT_TRUE(audio_handler->IsOutputMuted());
  // This should not change the state now and should not trigger output mute
  // changed event.
  audio_handler->SetOutputMute(false);
  EXPECT_TRUE(audio_handler->IsOutputMuted());
  EXPECT_EQ(1, test_observer->output_mute_changed_count());

  // Toggle back and observe if the output mute changed event is fired.
  policies.Set(key::kAudioOutputAllowed, POLICY_LEVEL_MANDATORY,
               POLICY_SCOPE_USER, POLICY_SOURCE_CLOUD, base::Value(true),
               nullptr);
  UpdateProviderPolicy(policies);
  EXPECT_FALSE(audio_handler->IsOutputMuted());
  EXPECT_EQ(1, test_observer->output_mute_changed_count());
  audio_handler->SetOutputMute(true);
  EXPECT_TRUE(audio_handler->IsOutputMuted());
  EXPECT_EQ(2, test_observer->output_mute_changed_count());
  // Revert the prior state.
  audio_handler->SetOutputMute(prior_state);
  audio_handler->RemoveAudioObserver(test_observer.get());
}

}  // namespace policy