Add test case for ping and pong

This provides a simple example for how to test, and also provides a
staring point for the tests for the logger.

Change-Id: Ieac6858156627c0efcdbb739612e6a4efaf19b80
diff --git a/aos/BUILD b/aos/BUILD
index a2c7134..4f87873 100644
--- a/aos/BUILD
+++ b/aos/BUILD
@@ -442,7 +442,8 @@
         "testdata/config3.json",
         "testdata/expected.json",
         "//aos/events:config.fb.json",
-        "//aos/events:pingpong.bfbs",
+        "//aos/events:ping.bfbs",
+        "//aos/events:pong.bfbs",
     ],
     deps = [
         ":configuration",