Test to estimate performance

Change-Id: I440a4be3d588b6b2d0a0d4d9f43efb1e12fd1f5e
Reviewed-on: https://team-review.git.corp.google.com/57053
Reviewed-by: Vitaly Buka <vitalybuka@google.com>
diff --git a/protobuf_mutator_test.cc b/protobuf_mutator_test.cc
index 927582c..f307222 100644
--- a/protobuf_mutator_test.cc
+++ b/protobuf_mutator_test.cc
@@ -389,6 +389,18 @@
   EXPECT_TRUE(Mutate(from_, to_));
 }
 
+TEST(ProtobufMutatorMessagesTest, SmallBenchmark) {
+  TestProtobufMutator mutator(false);
+  for (int i = 0; i < 100000; ++i) {
+    Msg message;
+    for (int j = 0; j < 20; ++j) {
+      mutator.Mutate(&message, 500, 1000);
+    }
+  }
+}
+
+// TODO(vitalybuka): Better benchmark.
+
 // TODO(vitalybuka): Special tests for oneof.
 
 }  // namespace protobuf_mutator