diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_parser-07.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_parser-07.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check that nodes with locaiton information attached can be properly
+ * verified for containing lines and columns.
+ */
+
+function test() {
+  let { ParserHelpers } = Cu.import("resource:///modules/devtools/Parser.jsm", {});
+
+  let node1 = { loc: {
+    start: { line: 1, column: 10 },
+    end: { line: 10, column: 1 }
+  }};
+  let node2 = { loc: {
+    start: { line: 1, column: 10 },
+    end: { line: 1, column: 20 }
+  }};
+
+  ok(ParserHelpers.nodeContainsLine(node1, 1), "1st check.");
+  ok(ParserHelpers.nodeContainsLine(node1, 5), "2nd check.");
+  ok(ParserHelpers.nodeContainsLine(node1, 10), "3rd check.");
+
+  ok(!ParserHelpers.nodeContainsLine(node1, 0), "4th check.");
+  ok(!ParserHelpers.nodeContainsLine(node1, 11), "5th check.");
+
+  ok(ParserHelpers.nodeContainsLine(node2, 1), "6th check.");
+  ok(!ParserHelpers.nodeContainsLine(node2, 0), "7th check.");
+  ok(!ParserHelpers.nodeContainsLine(node2, 2), "8th check.");
+
+  ok(!ParserHelpers.nodeContainsPoint(node1, 1, 10), "9th check.");
+  ok(!ParserHelpers.nodeContainsPoint(node1, 10, 1), "10th check.");
+
+  ok(!ParserHelpers.nodeContainsPoint(node1, 0, 10), "11th check.");
+  ok(!ParserHelpers.nodeContainsPoint(node1, 11, 1), "12th check.");
+
+  ok(!ParserHelpers.nodeContainsPoint(node1, 1, 9), "13th check.");
+  ok(!ParserHelpers.nodeContainsPoint(node1, 10, 2), "14th check.");
+
+  ok(ParserHelpers.nodeContainsPoint(node2, 1, 10), "15th check.");
+  ok(ParserHelpers.nodeContainsPoint(node2, 1, 15), "16th check.");
+  ok(ParserHelpers.nodeContainsPoint(node2, 1, 20), "17th check.");
+
+  ok(!ParserHelpers.nodeContainsPoint(node2, 0, 10), "18th check.");
+  ok(!ParserHelpers.nodeContainsPoint(node2, 2, 20), "19th check.");
+
+  ok(!ParserHelpers.nodeContainsPoint(node2, 0, 9), "20th check.");
+  ok(!ParserHelpers.nodeContainsPoint(node2, 2, 21), "21th check.");
+
+  ok(!ParserHelpers.nodeContainsPoint(node2, 1, 9), "22th check.");
+  ok(!ParserHelpers.nodeContainsPoint(node2, 1, 21), "23th check.");
+
+  finish();
+}