feat: publish CodexPi contest snapshot

frontend/tests/apiPayload.test.ts

@@ -0,0 +1,22 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import {expectArrayPayload, readJsonPayload} from '../src/apiPayload.ts'
+
+test('a truncated successful JSON response is rejected instead of becoming an object', async () => {
+  const response = new Response('{"messages":[', {
+    status: 200,
+    headers: {'Content-Type': 'application/json'},
+  })
+  await assert.rejects(() => readJsonPayload(response), /incomplète/i)
+})
+
+test('a valid JSON response is decoded', async () => {
+  const response = new Response('[{"id":"message-1"}]', {status: 200})
+  assert.deepEqual(await readJsonPayload(response), [{id: 'message-1'}])
+})
+
+test('array endpoints reject a valid but malformed payload', () => {
+  assert.throws(() => expectArrayPayload({}, 'messages'), /messages.*invalide/i)
+  assert.deepEqual(expectArrayPayload([{id: 'message-1'}], 'messages'), [{id: 'message-1'}])
+})