1 files changed, 20 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Script-mainOffset-01.js b/js/src/jit-test/tests/debug/Script-mainOffset-01.js
new file mode 100644
index 0000000000..ae958a523b
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Script-mainOffset-01.js
@@ -0,0 +1,20 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2; js-indent-level: 2 -*- */
+// The main offset of a script should be hit before it performs any actions.
+
+var g = newGlobal({newCompartment: true});
+g.eval("var n = 0; function foo() { n = 1; }");
+var dbg = Debugger(g);
+
+var hits = 0;
+function breakpointHit(frame) {
+  hits++;
+  assertEq(frame.eval("n").return, 0);
+}
+
+dbg.onDebuggerStatement = function (frame) {
+  var script = frame.eval("foo").return.script;
+  script.setBreakpoint(script.mainOffset, { hit: breakpointHit });
+};
+g.eval("debugger; foo()");
+assertEq(g.eval("n"), 1);
+assertEq(hits, 1);