diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Script-getOffsetLine-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Script-getOffsetLine-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+// Basic getOffsetLine test, using Error.lineNumber as the gold standard.
+
+var g = newGlobal();
+var dbg = Debugger(g);
+var hits;
+dbg.onDebuggerStatement = function (frame) {
+    var knownLine = frame.eval("line").return;
+    assertEq(frame.script.getOffsetLine(frame.offset), knownLine);
+    hits++;
+};
+
+hits = 0;
+g.eval("var line = new Error().lineNumber; debugger;");
+assertEq(hits, 1);
+
+hits = 0;
+g.eval("var s = 2 + 2;\n" +
+       "s += 2;\n" +
+       "line = new Error().lineNumber; debugger;\n" +
+       "s += 2;\n" +
+       "s += 2;\n" +
+       "line = new Error().lineNumber; debugger;\n" +
+       "s += 2;\n" +
+       "assertEq(s, 12);\n");
+assertEq(hits, 2);