diff --git a/runtime/guard.test.mjs b/runtime/guard.test.mjs
index fe0e479..067aef9 100644
--- a/runtime/guard.test.mjs
+++ b/runtime/guard.test.mjs
@@ -149,3 +149,4 @@ test('R14d: pieza correcta sobre tapscript con fuente tapscript → APROBADA', a
   const v = await guardCheck(pool, { channel: 'nostr', type: 'opinion', content: 'Multiplication in Tapscript just got cheaper. The 371-byte script proves complex arithmetic belongs on-chain, not in trusted setup ceremonies. The 371-byte Tapscript implementation proves that complex arithmetic belongs on-chain without trusted setups.\n\n— fuente: https://bitcoinmagazine.com/tapscript-multiplication · 2026-11-02' })
   assert.ok(v.ok, 'debe aprobar: ' + JSON.stringify(v.reasons))
 })
+import test from "node:test"; import assert from "node:assert"; test("demo rojo", () => { assert.ok(false, "falla a proposito (demo r19)") })