js/xpconnect/tests/chrome/test_nsScriptErrorWithStack.html

   1 <!DOCTYPE html>
   2 <meta charset=utf-8>
   3 <title>Test for 814497</title>
   4 <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
   5 <div id="log"></div>
   6 <script>
   7   var c = Cc;
   8
   9   SimpleTest.waitForExplicitFinish();
  10   SimpleTest.expectUncaughtException();
  11
  12   // /!\ Line number is important in this test,
  13   //     we are asserting the following functions line #
  14   function failingStack() {
  15     nestedFunction();
  16   }
  17   function nestedFunction() {
  18     // eslint-disable-next-line no-undef
  19     doesntExistsAndThrow();
  20   }
  21
  22   var TestObserver = {
  23     QueryInterface: ChromeUtils.generateQI(["nsIObserver"]),
  24
  25     observe: function test_observe(aSubject)
  26     {
  27       if (!(aSubject instanceof Ci.nsIScriptError)) {
  28         return;
  29       }
  30       dump("stack: "+aSubject.stack+"\n");
  31
  32       // Main assertions
  33       var s = aSubject.stack;
  34       ok(!!s, "has first frame");
  35       ok(s.source.includes("test_nsScriptErrorWithStack.html"), "source is correct");
  36       is(s.line, 19, "line is correct");
  37       is(s.column, 5, "column is correct");
  38       is(s.functionDisplayName, "nestedFunction");
  39       s = s.parent;
  40       ok(!!s, "has second frame");
  41       ok(s.source.includes("test_nsScriptErrorWithStack.html"), "source is correct");
  42       is(s.line, 15, "line is correct");
  43       is(s.column, 5, "column is correct");
  44       is(s.functionDisplayName, "failingStack");
  45       // We shouldn't have any more frame as we used setTimeout
  46       ok(!s.parent, "has no more frames");
  47
  48       // Cleanup
  49       Services.console.unregisterListener(TestObserver);
  50       SimpleTest.finish();
  51     }
  52   };
  53
  54   Services.console.registerListener(TestObserver);
  55
  56   // use setTimeout in order to prevent throwing from test frame
  57   // and so have a clean stack frame with just our method calls
  58   setTimeout(failingStack, 0);
  59 </script>