1 files changed, 59 insertions, 0 deletions
diff --git a/js/xpconnect/tests/chrome/test_nsScriptErrorWithStack.html b/js/xpconnect/tests/chrome/test_nsScriptErrorWithStack.html
new file mode 100644
index 0000000000..99a4727756
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+++ b/js/xpconnect/tests/chrome/test_nsScriptErrorWithStack.html
@@ -0,0 +1,59 @@
+<!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>