diff --git a/test/dnstoy.ml b/test/dnstoy.ml
index e69de29..965882e 100644
--- a/test/dnstoy.ml
+++ b/test/dnstoy.ml
@@ -0,0 +1,17 @@
+open Dnstoy.Utils
+
+let () =
+  let data =
+    { id = 0x1314
+    ; flags = 0
+    ; num_questions = 1
+    ; num_answers = 0
+    ; num_authorities = 0
+    ; num_additionals = 0
+    }
+  in
+  assert (
+    "\\x13\\x14\\x00\\x00\\x00\\x01\\x00\\x00\\x00\\x00\\x00\\x00"
+    = get_bytecode (header_to_bytes data));
+  assert ("\\x06google\\x03com\\x00" = get_bytecode (encode_dns_name "google.com"))
+;;