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diff --git a/modules/libjar/test/unit/test_bug379841.js b/modules/libjar/test/unit/test_bug379841.js
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+// Regression test for bug 379841 - nsIZipReader's last modified time ignores seconds
+
+var Cc = Components.classes;
+var Ci = Components.interfaces;
+const path = "data/test_bug379841.zip";
+// Retrieved time should be within 2 seconds of original file's time.
+const MAX_TIME_DIFF = 2000000;
+
+var ENTRY_NAME = "test";
+// Actual time of file was 07 May 2007 13:35:49 UTC
+var ENTRY_TIME = new Date(Date.UTC(2007, 4, 7, 13, 35, 49, 0));
+
+function run_test() {
+ var file = do_get_file(path);
+ var zipReader = Cc["@mozilla.org/libjar/zip-reader;1"].
+ createInstance(Ci.nsIZipReader);
+ zipReader.open(file);
+ var entry = zipReader.getEntry(ENTRY_NAME);
+ var diff = Math.abs(entry.lastModifiedTime - ENTRY_TIME.getTime()*1000);
+ zipReader.close();
+ if (diff >= MAX_TIME_DIFF)
+ do_throw(diff);
+}