audiopolicy: Add unit tests build target

This change adds audiopolicy_tests target for running
unit tests of AudioPolicyManager class.

AudioPolicyManager class is modified to allow
finer control over the configuration loading.

Test: audiopolicy_tests
Change-Id: Icf0cd7ff5b3b8b827b4f6909ff2c138ac2a2b82e
diff --git a/services/audiopolicy/tests/AudioPolicyTestClient.h b/services/audiopolicy/tests/AudioPolicyTestClient.h
new file mode 100644
index 0000000..c4da98a
--- /dev/null
+++ b/services/audiopolicy/tests/AudioPolicyTestClient.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include "AudioPolicyInterface.h"
+
+namespace android {
+
+class AudioPolicyTestClient : public AudioPolicyClientInterface
+{
+public:
+    virtual ~AudioPolicyTestClient() {}
+
+    // AudioPolicyClientInterface Implementation
+    audio_module_handle_t loadHwModule(const char* /*name*/) override { return 0; }
+    status_t openOutput(audio_module_handle_t /*module*/,
+                        audio_io_handle_t* /*output*/,
+                        audio_config_t* /*config*/,
+                        audio_devices_t* /*devices*/,
+                        const String8& /*address*/,
+                        uint32_t* /*latencyMs*/,
+                        audio_output_flags_t /*flags*/) override { return 0; }
+    audio_io_handle_t openDuplicateOutput(audio_io_handle_t /*output1*/,
+                                          audio_io_handle_t /*output2*/) override { return 0; }
+    status_t closeOutput(audio_io_handle_t /*output*/) override { return 0; }
+    status_t suspendOutput(audio_io_handle_t /*output*/) override { return 0; }
+    status_t restoreOutput(audio_io_handle_t /*output*/) override { return 0; }
+    status_t openInput(audio_module_handle_t /*module*/,
+                       audio_io_handle_t* /*input*/,
+                       audio_config_t* /*config*/,
+                       audio_devices_t* /*device*/,
+                       const String8& /*address*/,
+                       audio_source_t /*source*/,
+                       audio_input_flags_t /*flags*/) override { return 0; }
+    status_t closeInput(audio_io_handle_t /*input*/) override { return 0; }
+    status_t setStreamVolume(audio_stream_type_t /*stream*/,
+                             float /*volume*/,
+                             audio_io_handle_t /*output*/,
+                             int /*delayMs*/) override { return 0; }
+    status_t invalidateStream(audio_stream_type_t /*stream*/) override { return 0; }
+    void setParameters(audio_io_handle_t /*ioHandle*/,
+                       const String8& /*keyValuePairs*/,
+                       int /*delayMs*/) override { }
+    String8 getParameters(audio_io_handle_t /*ioHandle*/,
+                          const String8& /*keys*/) override { return String8(); }
+    status_t startTone(audio_policy_tone_t /*tone*/,
+                       audio_stream_type_t /*stream*/) override { return 0; }
+    status_t stopTone() override { return 0; }
+    status_t setVoiceVolume(float /*volume*/, int /*delayMs*/) override { return 0; }
+    status_t moveEffects(audio_session_t /*session*/,
+                         audio_io_handle_t /*srcOutput*/,
+                         audio_io_handle_t /*dstOutput*/) override { return 0; }
+    status_t createAudioPatch(const struct audio_patch* /*patch*/,
+                              audio_patch_handle_t* /*handle*/,
+                              int /*delayMs*/) override { return 0; }
+    status_t releaseAudioPatch(audio_patch_handle_t /*handle*/,
+                               int /*delayMs*/) override { return 0; }
+    status_t setAudioPortConfig(const struct audio_port_config* /*config*/,
+                                int /*delayMs*/) override { return 0; }
+    void onAudioPortListUpdate() override { }
+    void onAudioPatchListUpdate() override { }
+    audio_unique_id_t newAudioUniqueId(audio_unique_id_use_t /*use*/) override { return 0; }
+    void onDynamicPolicyMixStateUpdate(String8 /*regId*/, int32_t /*state*/) override { }
+    void onRecordingConfigurationUpdate(int /*event*/,
+                                        const record_client_info_t* /*clientInfo*/,
+                                        const struct audio_config_base* /*clientConfig*/,
+                                        const struct audio_config_base* /*deviceConfig*/,
+                                        audio_patch_handle_t /*patchHandle*/) override { }
+};
+
+} // namespace android