MediaMetrics: Add unit tests

Document some interface differences.

Test: mediametrics_tests
Change-Id: Idf19827e79136dcca6522e6df53e28e3ea4a2231
diff --git a/services/mediaanalytics/tests/Android.bp b/services/mediaanalytics/tests/Android.bp
new file mode 100644
index 0000000..7bca1c4
--- /dev/null
+++ b/services/mediaanalytics/tests/Android.bp
@@ -0,0 +1,25 @@
+cc_test {
+    name: "mediametrics_tests",
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wextra",
+    ],
+
+    include_dirs: [
+        "frameworks/av/services/mediaanalytics",
+    ],
+
+    shared_libs: [
+        "libbinder",
+        "liblog",
+        "libmediaanalyticsservice",
+        "libmediametrics",
+        "libutils",
+    ],
+
+    srcs: [
+        "mediametrics_tests.cpp",
+    ],
+}
diff --git a/services/mediaanalytics/tests/build_and_run_all_unit_tests.sh b/services/mediaanalytics/tests/build_and_run_all_unit_tests.sh
new file mode 100755
index 0000000..2511c30
--- /dev/null
+++ b/services/mediaanalytics/tests/build_and_run_all_unit_tests.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+# Run tests in this directory.
+#
+
+if [ -z "$ANDROID_BUILD_TOP" ]; then
+    echo "Android build environment not set"
+    exit -1
+fi
+
+# ensure we have mm
+. $ANDROID_BUILD_TOP/build/envsetup.sh
+
+mm
+
+echo "waiting for device"
+
+adb root && adb wait-for-device remount
+
+echo "========================================"
+
+echo "testing mediametrics"
+adb push $OUT/data/nativetest/mediametrics_tests/mediametrics_tests /system/bin
+adb shell /system/bin/mediametrics_tests
diff --git a/services/mediaanalytics/tests/mediametrics_tests.cpp b/services/mediaanalytics/tests/mediametrics_tests.cpp
new file mode 100644
index 0000000..794b2f0
--- /dev/null
+++ b/services/mediaanalytics/tests/mediametrics_tests.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#define LOG_TAG "mediametrics_tests"
+#include <utils/Log.h>
+
+#include "MediaAnalyticsService.h"
+
+#include <stdio.h>
+
+#include <gtest/gtest.h>
+#include <media/MediaAnalyticsItem.h>
+
+using namespace android;
+
+TEST(mediametrics_tests, instantiate) {
+  sp mediaMetrics = new MediaAnalyticsService();
+  status_t status;
+
+  // NOTE: submission of items to MediaMetrics releases ownership, even on error.
+
+  // random keys ignored when empty
+  status = mediaMetrics->submit(MediaAnalyticsItem::create("random_key"), false);
+  ASSERT_EQ(MediaAnalyticsItem::SessionIDInvalid, status);
+
+  // random keys ignored with data
+  auto random_key = MediaAnalyticsItem::create("random_key");
+  random_key->setInt32("foo", 10);
+  status = mediaMetrics->submit(random_key, false);
+  ASSERT_EQ(MediaAnalyticsItem::SessionIDInvalid, status);
+
+  // known keys ignored if empty
+  status = mediaMetrics->submit(MediaAnalyticsItem::create("audiotrack"), false);
+  ASSERT_EQ(MediaAnalyticsItem::SessionIDInvalid, status);
+
+  auto audiotrack = MediaAnalyticsItem::create("audiotrack");
+  audiotrack->addInt32("foo", 10);
+  status = mediaMetrics->submit(audiotrack, false);
+  ASSERT_GT(status, MediaAnalyticsItem::SessionIDNone);
+
+  mediaMetrics->dump(fileno(stdout), {} /* args */);
+}