diff --git a/services/history-v1/test/acceptance/js/storage/backupBlob.test.mjs b/services/history-v1/test/acceptance/js/storage/backupBlob.test.mjs
index 161acb7a55..8e05e76819 100644
--- a/services/history-v1/test/acceptance/js/storage/backupBlob.test.mjs
+++ b/services/history-v1/test/acceptance/js/storage/backupBlob.test.mjs
@@ -157,6 +157,12 @@ describe('backupBlob', function () {
       content: Buffer.from('x'.repeat(1000)),
       storedSize: 29, // zlib.gzipSync(content).byteLength
     },
+    {
+      name: 'large text file',
+      // 'ä' is a 2-byte utf-8 character -> 4MB.
+      content: Buffer.from('ü'.repeat(2 * 1024 * 1024)),
+      storedSize: 4101, // zlib.gzipSync(content).byteLength
+    },
     {
       name: 'binary file',
       content: Buffer.from([0, 1, 2, 3]),