1 files changed, 33 insertions, 0 deletions
diff --git a/modules/libjar/zipwriter/test/unit/test_bug425768.js b/modules/libjar/zipwriter/test/unit/test_bug425768.js
new file mode 100644
index 0000000000..d3a9b30ba6
--- /dev/null
+++ b/modules/libjar/zipwriter/test/unit/test_bug425768.js
@@ -0,0 +1,33 @@
+/* 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 DIRNAME = "test/";
+const time = Date.now();
+
+function run_test() {
+  // Copy in the test file.
+  var source = do_get_file("data/test.zip");
+  source.copyTo(tmpFile.parent, tmpFile.leafName);
+
+  // Open it and add something so the CDS is rewritten.
+  zipW.open(tmpFile, PR_RDWR | PR_APPEND);
+  zipW.addEntryDirectory(DIRNAME, time * PR_USEC_PER_MSEC, false);
+  Assert.ok(zipW.hasEntry(DIRNAME));
+  zipW.close();
+
+  var zipR = new ZipReader(tmpFile);
+  Assert.ok(zipR.hasEntry(DIRNAME));
+  zipR.close();
+
+  // Adding the directory would have added a fixed amount to the file size.
+  // Any difference suggests the CDS was written out incorrectly.
+  var extra =
+    ZIP_FILE_HEADER_SIZE +
+    ZIP_CDS_HEADER_SIZE +
+    DIRNAME.length * 2 +
+    ZIP_EXTENDED_TIMESTAMP_SIZE * 2;
+
+  Assert.equal(source.fileSize + extra, tmpFile.fileSize);
+}