testing/xpcshell/example/unit/test_check_nsIException.js


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/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/ */

function run_test() {
  let env = Components.classes["@mozilla.org/process/environment;1"]
                      .getService(Components.interfaces.nsIEnvironment);
  do_check_throws_nsIException(function () {
    env.QueryInterface(Components.interfaces.nsIFile);
  }, "NS_NOINTERFACE");
}