test/mjsunit/error-tostring-omit.js

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function veryLongString() {
  return "Lorem ipsum dolor sit amet, consectetur adipiscing elit." +
         "Nam vulputate metus est. Maecenas quis pellentesque eros," +
         "ac mattis augue. Nam porta purus vitae tincidunt blandit." +
         "Aliquam lacus dui, blandit id consectetur id, hendrerit ut" +
         "felis. Class aptent taciti sociosqu ad litora torquent per" +
         "conubia nostra, per inceptos himenaeos. Ut posuere eros et" +
         "tempus luctus. Nullam condimentum aliquam odio, at dignissim" +
         "augue tincidunt in. Nam mattis vitae mauris eget dictum." +
         "Nam accumsan dignissim turpis a turpis duis.";
}

assertTrue(veryLongString().length > 256);

var re = /...<omitted>.../;

try {
  Number.prototype.toFixed.call(veryLongString);
} catch (e) {
  assertTrue(e.message.length < 256);
  assertTrue(re.test(e.message));
}

try {
  throw Error(veryLongString());
} catch (e) {
  assertEquals(veryLongString(), e.message);
}