Add test for AStatsSocket_close()

Bug: 154871176
Test: atest libstatssocket_test
Change-Id: If8aa26a9a9a75382b6f8779c23974a7008bd387a
diff --git a/libstats/socket/Android.bp b/libstats/socket/Android.bp
index 3f42088..4b3a0de 100644
--- a/libstats/socket/Android.bp
+++ b/libstats/socket/Android.bp
@@ -109,7 +109,10 @@
 
 cc_test {
     name: "libstatssocket_test",
-    srcs: ["tests/stats_event_test.cpp"],
+    srcs: [
+        "tests/stats_event_test.cpp",
+        "tests/stats_writer_test.cpp",
+    ],
     cflags: [
         "-Wall",
         "-Werror",