Add RecommendSampleRate to audio config test.

ppapi/tests/test_audio_config.cc

 // Copyright (c) 2012 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 "ppapi/tests/test_audio_config.h"
 
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/tests/testing_instance.h"
 
 REGISTER_TEST_CASE(AudioConfig);
 
 bool TestAudioConfig::Init() {
   audio_config_interface_ = static_cast<const PPB_AudioConfig*>(
       pp::Module::Get()->GetBrowserInterface(PPB_AUDIO_CONFIG_INTERFACE));
   core_interface_ = static_cast<const PPB_Core*>(
       pp::Module::Get()->GetBrowserInterface(PPB_CORE_INTERFACE));
   return audio_config_interface_ && core_interface_;
 }
 
 void TestAudioConfig::RunTests(const std::string& filter) {
+  RUN_TEST(RecommendSampleRate, filter);
   RUN_TEST(ValidConfigs, filter);
   RUN_TEST(InvalidConfigs, filter);
 }
 
+std::string TestAudioConfig::TestRecommendSampleRate() {
+  // Ask PPB_AudioConfig about the recommended sample rate.
+  PP_AudioSampleRate sample_rate = audio_config_interface_->RecommendSampleRate(
+      instance_->pp_instance());
+  ASSERT_TRUE(sample_rate == PP_AUDIOSAMPLERATE_NONE ||
+              sample_rate == PP_AUDIOSAMPLERATE_44100 ||
+              sample_rate == PP_AUDIOSAMPLERATE_48000);
+
+  PASS();
+}
+
 std::string TestAudioConfig::TestValidConfigs() {
   static const PP_AudioSampleRate kSampleRates[] = {
     PP_AUDIOSAMPLERATE_44100,
     PP_AUDIOSAMPLERATE_48000
   };
   static const uint32_t kRequestFrameCounts[] = {
     PP_AUDIOMINSAMPLEFRAMECOUNT,
     PP_AUDIOMAXSAMPLEFRAMECOUNT,
     // Include some "okay-looking" frame counts; check their validity below.
     1024,
@@ skipping 51 matching lines @@
       PP_AUDIOMAXSAMPLEFRAMECOUNT + 1u);
   ASSERT_EQ(0, ac);
 
   // Test rest of API whose failure cases are defined.
   ASSERT_FALSE(audio_config_interface_->IsAudioConfig(0));
   ASSERT_EQ(PP_AUDIOSAMPLERATE_NONE, audio_config_interface_->GetSampleRate(0));
   ASSERT_EQ(0u, audio_config_interface_->GetSampleFrameCount(0));
 
   PASS();
 }