function run_test() { let result = Cc["@mozilla.org/autocomplete/simple-result;1"] .createInstance(Ci.nsIAutoCompleteSimpleResult); result.appendMatch("a", ""); result.appendMatch("c", ""); result.insertMatchAt(1, "b", ""); result.insertMatchAt(3, "d", ""); Assert.equal(result.matchCount, 4); Assert.equal(result.getValueAt(0), "a"); Assert.equal(result.getValueAt(1), "b"); Assert.equal(result.getValueAt(2), "c"); Assert.equal(result.getValueAt(3), "d"); }