diff --git a/tests/brief-outbox.test.mjs b/tests/brief-outbox.test.mjs
index 3bcdb32..52c006a 100644
--- a/tests/brief-outbox.test.mjs
+++ b/tests/brief-outbox.test.mjs
@@ -22,6 +22,12 @@ function sender(outbox, overrides={}) {
     sendEmail:async()=>({id:'synthetic-receipt'}),warn:()=>{},...overrides});
 }
 
+test('invalid weekly manifest is rejected before it reaches the queue', t=>{
+  const {outbox}=fixture(t);
+  assert.throws(()=>outbox.prepare('2026-09-07','bad@example.test',{channel:'email'}),/manifesti bozuk/);
+  assert.throws(()=>outbox.prepare('2026-09-07','bad@example.test',[{to:{email:'bad'}}]),/manifesti bozuk/);
+});
+
 test('accepted delivery survives reopening and does not send again; weeks and owners are isolated',async t=>{
   const {outbox,directory}=fixture(t);let calls=0;
   const transport={sendEmail:async()=>{calls++;return {id:'receipt'};}};