diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_stack-06.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_stack-06.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,88 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Make sure that selecting a stack frame loads the right source in the editor
+ * pane and highlights the proper line.
+ */
+
+const TAB_URL = EXAMPLE_URL + "doc_script-switching-01.html";
+
+let gTab, gDebuggee, gPanel, gDebugger;
+let gEditor, gSources, gFrames, gClassicFrames;
+
+function test() {
+  initDebugger(TAB_URL).then(([aTab, aDebuggee, aPanel]) => {
+    gTab = aTab;
+    gDebuggee = aDebuggee;
+    gPanel = aPanel;
+    gDebugger = gPanel.panelWin;
+    gEditor = gDebugger.DebuggerView.editor;
+    gSources = gDebugger.DebuggerView.Sources;
+    gFrames = gDebugger.DebuggerView.StackFrames;
+    gClassicFrames = gDebugger.DebuggerView.StackFramesClassicList;
+
+    waitForSourceAndCaretAndScopes(gPanel, "-02.js", 1).then(performTest);
+    gDebuggee.firstCall();
+  });
+}
+
+function performTest() {
+  is(gFrames.selectedIndex, 3,
+    "Newest frame should be selected by default.");
+  is(gClassicFrames.selectedIndex, 0,
+    "Newest frame should also be selected in the mirrored view.");
+  is(gSources.selectedIndex, 1,
+    "The second source is selected in the widget.");
+  is(gEditor.getText().search(/firstCall/), -1,
+    "The first source is not displayed.");
+  is(gEditor.getText().search(/debugger/), 172,
+    "The second source is displayed.");
+
+  waitForSourceAndCaret(gPanel, "-01.js", 1).then(waitForTick).then(() => {
+    is(gFrames.selectedIndex, 0,
+      "Oldest frame should be selected after click.");
+    is(gClassicFrames.selectedIndex, 3,
+      "Oldest frame should also be selected in the mirrored view.");
+    is(gSources.selectedIndex, 0,
+      "The first source is now selected in the widget.");
+    is(gEditor.getText().search(/firstCall/), 118,
+      "The first source is displayed.");
+    is(gEditor.getText().search(/debugger/), -1,
+      "The second source is not displayed.");
+
+    waitForSourceAndCaret(gPanel, "-02.js", 1).then(waitForTick).then(() => {
+      is(gFrames.selectedIndex, 3,
+        "Newest frame should be selected again after click.");
+      is(gClassicFrames.selectedIndex, 0,
+        "Newest frame should also be selected again in the mirrored view.");
+      is(gSources.selectedIndex, 1,
+        "The second source is selected in the widget.");
+      is(gEditor.getText().search(/firstCall/), -1,
+        "The first source is not displayed.");
+      is(gEditor.getText().search(/debugger/), 172,
+        "The second source is displayed.");
+
+      resumeDebuggerThenCloseAndFinish(gPanel);
+    });
+
+    EventUtils.sendMouseEvent({ type: "mousedown" },
+      gDebugger.document.querySelector("#classic-stackframe-0"),
+      gDebugger);
+  });
+
+  EventUtils.sendMouseEvent({ type: "mousedown" },
+    gDebugger.document.querySelector("#stackframe-3"),
+    gDebugger);
+}
+
+registerCleanupFunction(function() {
+  gTab = null;
+  gDebuggee = null;
+  gPanel = null;
+  gDebugger = null;
+  gEditor = null;
+  gSources = null;
+  gFrames = null;
+  gClassicFrames = null;
+});