1 files changed, 31 insertions, 0 deletions
diff --git a/xpcom/tests/unit/test_file_createUnique.js b/xpcom/tests/unit/test_file_createUnique.js
new file mode 100644
index 0000000000..8667f16495
--- /dev/null
+++ b/xpcom/tests/unit/test_file_createUnique.js
@@ -0,0 +1,31 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
+
+function run_test() {
+  // Generate a leaf name that is 255 characters long.
+  var longLeafName = new Array(256).join("T");
+
+  // Generate the path for a file located in a directory with a long name.
+  var tempFile = Services.dirsvc.get("TmpD", Ci.nsIFile);
+  tempFile.append(longLeafName);
+  tempFile.append("test.txt");
+
+  try {
+    tempFile.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+    do_throw("Creating an item in a folder with a very long name should throw");
+  } catch (e) {
+    if (
+      !(
+        e instanceof Ci.nsIException &&
+        e.result == Cr.NS_ERROR_FILE_UNRECOGNIZED_PATH
+      )
+    ) {
+      throw e;
+    }
+    // We expect the function not to crash but to raise this exception.
+  }
+}