diff --git a/qrencode.spec.lua b/qrencode.spec.lua
index c1497fb..fb48891 100644
--- a/qrencode.spec.lua
+++ b/qrencode.spec.lua
@@ -1,5 +1,13 @@
 
 mtt.register("otp.qrcode", function(callback)
     assert(type(otp.qrcode) == "function")
+
+    local url = "otpauth://totp/abc:myaccount?algorithm=SHA1&digits=6&issuer=abc&period=30&"
+        .. "secret=N6JGKMEKU2E6HQMLLNMJKBRRGVQ2ZKV7"
+
+    local ok, code = otp.qrcode(url)
+    assert(ok)
+    assert(code)
+
     callback()
 end)
\ No newline at end of file