Add VTS test for validating audio effects config against XML schema

If the device contains /vendor/etc/audio_effects.xml (the new XML
format for the audio effects configuration), the test validates
this config against the schema contained in
audio/effect/2.0/xml/audio_effects_conf_V2_0.xsd
(pushed to the device by the VTS test runner)

Change-Id: Ib57d30e3c1e32ce5d74f906a216f9bb8f635a28c
Test: this is a test
Bug: 37492580
diff --git a/audio/effect/2.0/vts/functional/Android.bp b/audio/effect/2.0/vts/functional/Android.bp
index 8a370cd..b3002a4 100644
--- a/audio/effect/2.0/vts/functional/Android.bp
+++ b/audio/effect/2.0/vts/functional/Android.bp
@@ -17,7 +17,8 @@
 cc_test {
     name: "VtsHalAudioEffectV2_0TargetTest",
     defaults: ["hidl_defaults"],
-    srcs: ["VtsHalAudioEffectV2_0TargetTest.cpp"],
+    srcs: ["VtsHalAudioEffectV2_0TargetTest.cpp",
+           "ValidateAudioEffectsConfiguration.cpp"],
     shared_libs: [
         "libbase",
         "liblog",
@@ -26,7 +27,9 @@
         "libhidltransport",
         "libnativehelper",
         "libutils",
+        "libxml2",
         "android.hardware.audio.common@2.0",
+        "android.hardware.audio.common.test.utility",
         "android.hardware.audio.effect@2.0",
         "android.hidl.allocator@1.0",
         "android.hidl.memory@1.0",
@@ -35,5 +38,6 @@
     cflags: [
         "-O0",
         "-g",
+        "-Wextra",
     ],
 }
diff --git a/audio/effect/2.0/vts/functional/ValidateAudioEffectsConfiguration.cpp b/audio/effect/2.0/vts/functional/ValidateAudioEffectsConfiguration.cpp
new file mode 100644
index 0000000..fdc1347
--- /dev/null
+++ b/audio/effect/2.0/vts/functional/ValidateAudioEffectsConfiguration.cpp
@@ -0,0 +1,30 @@
+/*
+ * 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.
+ */
+
+#include <unistd.h>
+
+#include "utility/ValidateXml.h"
+
+TEST(CheckConfig, audioEffectsConfigurationValidation) {
+    RecordProperty("description",
+                   "Verify that the effects configuration file is valid according to the schema");
+    const char* xmlConfigFile = "/vendor/etc/audio_effects.xml";
+    // Not every device uses XML configuration, so only validate
+    // if the XML configuration actually exists.
+    if (access(xmlConfigFile, F_OK) == 0) {
+        ASSERT_VALID_XML(xmlConfigFile, "/data/local/tmp/audio_effects_conf_V2_0.xsd");
+    }
+}