testConcat_empty  612 third_party/protobuf/java/src/test/java/com/google/protobuf/ByteStringTest.java   public void testConcat_empty() {
testConcat_empty  390 third_party/protobuf/java/src/test/java/com/google/protobuf/LiteralByteStringTest.java   public void testConcat_empty() {