diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_break-on-dom-08.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_break-on-dom-08.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests that breaking on an event selects the variables view tab.
+ */
+
+const TAB_URL = EXAMPLE_URL + "doc_event-listeners-02.html";
+
+function test() {
+  initDebugger(TAB_URL).then(([aTab, aDebuggee, aPanel]) => {
+    let gDebugger = aPanel.panelWin;
+    let gView = gDebugger.DebuggerView;
+    let gEvents = gView.EventListeners;
+
+    Task.spawn(function() {
+      yield waitForSourceShown(aPanel, ".html");
+      aDebuggee.addBodyClickEventListener();
+
+      let fetched = waitForDebuggerEvents(aPanel, gDebugger.EVENTS.EVENT_LISTENERS_FETCHED);
+      gView.toggleInstrumentsPane({ visible: true, animated: false }, 1);
+      yield fetched;
+      yield ensureThreadClientState(aPanel, "resumed");
+
+      is(gView.instrumentsPaneHidden, false,
+        "The instruments pane should be visible.");
+      is(gView.instrumentsPaneTab, "events-tab",
+        "The events tab should be selected.");
+
+      let updated = waitForDebuggerEvents(aPanel, gDebugger.EVENTS.EVENT_BREAKPOINTS_UPDATED);
+      EventUtils.sendMouseEvent({ type: "click" }, getItemCheckboxNode(1), gDebugger);
+      yield updated;
+      yield ensureThreadClientState(aPanel, "resumed");
+
+      let paused = waitForCaretAndScopes(aPanel, 48);
+      // Spin the event loop before causing the debuggee to pause, to allow
+      // this function to yield first.
+      executeSoon(() => {
+        EventUtils.sendMouseEvent({ type: "click" }, aDebuggee.document.body, aDebuggee);
+      });
+      yield paused;
+      yield ensureThreadClientState(aPanel, "paused");
+
+      is(gView.instrumentsPaneHidden, false,
+        "The instruments pane should be visible.");
+      is(gView.instrumentsPaneTab, "variables-tab",
+        "The variables tab should be selected.");
+
+      yield resumeDebuggerThenCloseAndFinish(aPanel);
+    });
+
+    function getItemCheckboxNode(index) {
+      return gEvents.items[index].target.parentNode
+        .querySelector(".side-menu-widget-item-checkbox");
+    }
+  });
+}