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diff --git a/comm/mailnews/base/test/unit/test_bug514945.js b/comm/mailnews/base/test/unit/test_bug514945.js
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+++ b/comm/mailnews/base/test/unit/test_bug514945.js
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+/* 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/. */
+
+/*
+ * Testing of GetAvailable crashes in bug 514945
+ */
+
+function run_test() {
+  const kValidityManager = Cc[
+    "@mozilla.org/mail/search/validityManager;1"
+  ].getService(Ci.nsIMsgSearchValidityManager);
+
+  let validityTable = kValidityManager.getTable(
+    Ci.nsMsgSearchScope.offlineMail
+  );
+
+  // When we try to access a bad value of getAvailable, it should give an error,
+  //  not crash.
+  let BAD_VALUE = 1000000; // some large value that is beyond the array bounds
+  let haveExpectedError = false;
+  try {
+    validityTable.getAvailable(Ci.nsMsgSearchAttrib.Subject, BAD_VALUE);
+  } catch (e) {
+    dump("Error but no crash, this is what we want:" + e + "\n");
+    haveExpectedError = true;
+  }
+
+  Assert.ok(haveExpectedError);
+
+  // One of the causes of this is that search term operators are not being
+  // initialized, resulting in random values of the operator. Make sure that is
+  // fixed.
+
+  const kSearchSession = Cc[
+    "@mozilla.org/messenger/searchSession;1"
+  ].createInstance(Ci.nsIMsgSearchSession);
+  let searchTerm = kSearchSession.createTerm();
+  Assert.equal(searchTerm.op, Ci.nsMsgSearchOp.Contains);
+}