diff --git a/packages/code-runtime/code-runtime-worker/tests/worker-json.spec.ts b/packages/code-runtime/code-runtime-worker/tests/worker-json.spec.ts
index e0c8310a6a..6ef8d30a09 100644
--- a/packages/code-runtime/code-runtime-worker/tests/worker-json.spec.ts
+++ b/packages/code-runtime/code-runtime-worker/tests/worker-json.spec.ts
@@ -230,6 +230,7 @@ describe('flat worker JSON wire', () => {
       [foreignMarker],
       [hiddenMarker],
       [{ kind: 'unknown' }],
+      [{ kind: 'array', bogus: 0 }],
       [{ kind: 'array' }],
       [{ kind: 'array', length: '1' }],
       [{ kind: 'array', length: -1 }],