CEC: Add VTS test to enable audio return channel

Test: atest VtsHalTvCecV1_0TargetTest
Bug: 172316717
Change-Id: Ia5d6e8f08ba68d75c68bffbf8d7a90cbf0b67532
diff --git a/tv/cec/1.0/vts/functional/VtsHalTvCecV1_0TargetTest.cpp b/tv/cec/1.0/vts/functional/VtsHalTvCecV1_0TargetTest.cpp
index b6f4b83..1ab040e 100644
--- a/tv/cec/1.0/vts/functional/VtsHalTvCecV1_0TargetTest.cpp
+++ b/tv/cec/1.0/vts/functional/VtsHalTvCecV1_0TargetTest.cpp
@@ -137,3 +137,16 @@
     Return<void> ret = hdmiCec->setLanguage("eng");
     EXPECT_TRUE(ret.isOk());
 }
+
+TEST_P(HdmiCecTest, EnableAudioReturnChannel) {
+    hidl_vec<HdmiPortInfo> ports;
+    Return<void> ret =
+            hdmiCec->getPortInfo([&ports](hidl_vec<HdmiPortInfo> list) { ports = list; });
+    EXPECT_TRUE(ret.isOk());
+    for (size_t i = 0; i < ports.size(); ++i) {
+        if (ports[i].arcSupported) {
+            ret = hdmiCec->enableAudioReturnChannel(ports[i].portId, true);
+            EXPECT_TRUE(ret.isOk());
+        }
+    }
+}