Tests for disabling while zeroing

Change-Id: I43c7d99c5783b818d2309df0a221e9afe1dc5e03
diff --git a/aos/common/controls/control_loop_test.h b/aos/common/controls/control_loop_test.h
index 30115b8..4ab4774 100644
--- a/aos/common/controls/control_loop_test.h
+++ b/aos/common/controls/control_loop_test.h
@@ -53,6 +53,8 @@
   ::aos::time::Time current_time_ = ::aos::time::Time::InSeconds(0);
 
   ::aos::testing::TestSharedMemory my_shm_;
+
+  bool last_enabled_ = false;
 };
 
 }  // namespace testing