diff --git a/src/proto_alpha/lib_protocol/test/helpers/op.ml b/src/proto_alpha/lib_protocol/test/helpers/op.ml
index 63156c956..fc638e0e9 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/op.ml
+++ b/src/proto_alpha/lib_protocol/test/helpers/op.ml
@@ -206,3 +206,12 @@ let double_baking ctxt bh1 bh2 =
         signature = None ;
       } ;
   }
+
+let seed_nonce_revelation ctxt level nonce =
+  return
+    { shell = { branch = Context.branch ctxt } ;
+      protocol_data = Operation_data {
+          contents = Single (Seed_nonce_revelation { level ; nonce }) ;
+          signature = None ;
+        } ;
+    }
diff --git a/src/proto_alpha/lib_protocol/test/helpers/op.mli b/src/proto_alpha/lib_protocol/test/helpers/op.mli
index ec16c9bf2..01f25ed49 100644
--- a/src/proto_alpha/lib_protocol/test/helpers/op.mli
+++ b/src/proto_alpha/lib_protocol/test/helpers/op.mli
@@ -74,3 +74,7 @@ val activation:
   Context.t ->
   Signature.Public_key_hash.t -> Blinded_public_key_hash.activation_code ->
   Operation.packed tzresult Lwt.t
+
+(** Reveals a seed_nonce that was previously committed at a certain level *)
+val seed_nonce_revelation:
+  Context.t -> Raw_level.t -> Nonce.t -> Operation.packed tzresult Lwt.t