test_nsScriptErrorWithStack.html

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<!DOCTYPE html>

<meta charset=utf-8>

<title>Test for 814497</title>

<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

<div id="log"></div>

<script>

  var c = Cc;

  SimpleTest.waitForExplicitFinish();

  SimpleTest.expectUncaughtException();

  // /!\ Line number is important in this test,

  //     we are asserting the following functions line #

  function failingStack() {

    nestedFunction();

  function nestedFunction() {

    // eslint-disable-next-line no-undef

    doesntExistsAndThrow();

  var TestObserver = {

    QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),

    observe: function test_observe(aSubject)

      if (!(aSubject instanceof Ci.nsIScriptError)) {

        return;

      dump("stack: "+aSubject.stack+"\n");

      // Main assertions

      var s = aSubject.stack;

      ok(!!s, "has first frame");

      ok(s.source.includes("test_nsScriptErrorWithStack.html"), "source is correct");

      is(s.line, 19, "line is correct");

      is(s.column, 5, "column is correct");

      is(s.functionDisplayName, "nestedFunction");

      s = s.parent;

      ok(!!s, "has second frame");

      ok(s.source.includes("test_nsScriptErrorWithStack.html"), "source is correct");

      is(s.line, 15, "line is correct");

      is(s.column, 5, "column is correct");

      is(s.functionDisplayName, "failingStack");

      // We shouldn't have any more frame as we used setTimeout

      ok(!s.parent, "has no more frames");

      // Cleanup

      Services.console.unregisterListener(TestObserver);

      SimpleTest.finish();

};

  Services.console.registerListener(TestObserver);

  // use setTimeout in order to prevent throwing from test frame

  // and so have a clean stack frame with just our method calls

  setTimeout(failingStack, 0);

</script>