Test automatic import to Piper

Testing automatic import to Piper since it's a SOT for rules_proto.

tests/BUILD

diff --git a/tests/BUILD b/tests/BUILD
index a0baa9d..2381713 100644
--- a/tests/BUILD
+++ b/tests/BUILD
@@ -1,7 +1,5 @@
 load("//proto:defs.bzl", "proto_library")
 
-# Test automatic import.
-
 proto_library(
     name = "empty_proto",
     srcs = [