diff --git a/plugins/linguist-backend/src/api/LinguistBackendClient.test.ts b/plugins/linguist-backend/src/api/LinguistBackendClient.test.ts
index 1b0a4f4673..55c74df424 100644
--- a/plugins/linguist-backend/src/api/LinguistBackendClient.test.ts
+++ b/plugins/linguist-backend/src/api/LinguistBackendClient.test.ts
@@ -38,6 +38,9 @@ const linguistResultMock = Promise.resolve({
       '/readme.md': 'Markdown',
       '/no-lang': null,
     },
+    alternatives: {
+      '~/alternatives.asc': ['AsciiDoc', 'Public Key'],
+    },
   },
   languages: {
     count: 3,