diff --git a/test/fixtures/bad-docs.js b/test/fixtures/bad-docs.js
index 88e6190..eac3cab 100644
--- a/test/fixtures/bad-docs.js
+++ b/test/fixtures/bad-docs.js
@@ -24,6 +24,23 @@ export const badDocs = [
       deleted: false,
     },
   },
+  {
+    text: 'test schema name that could "trick" JavaScript',
+    /** @type Omit<import('../../dist/index.js').Observation, 'schemaName'> & { schemaName: 'hasOwnProperty' }} */
+    doc: {
+      docId: cachedValues.docId,
+      versionId: cachedValues.versionId,
+      originalVersionId: cachedValues.versionId,
+      schemaName: 'hasOwnProperty',
+      createdAt: cachedValues.createdAt,
+      updatedAt: cachedValues.updatedAt,
+      links: [],
+      attachments: [],
+      tags: {},
+      metadata: {},
+      deleted: false,
+    },
+  },
   {
     text: 'missing expected originalVersionId',
     /** @type Omit<import('../../dist/index.js').Observation, 'originalVersionId'> */