diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_location-changes-01-simple.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_location-changes-01-simple.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,71 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Make sure that changing the tab location URL works.
+ */
+
+const TAB_URL = EXAMPLE_URL + "doc_recursion-stack.html";
+
+let gTab, gDebuggee, gPanel, gDebugger;
+let gEditor, gSources, gFrames;
+
+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;
+
+    waitForSourceAndCaretAndScopes(gPanel, ".html", 14).then(performTest);
+    gDebuggee.simpleCall();
+  });
+}
+
+function performTest() {
+  is(gDebugger.gThreadClient.state, "paused",
+    "Should only be getting stack frames while paused.");
+
+  is(gFrames.itemCount, 1,
+    "Should have only one frame.");
+
+  is(gSources.itemCount, 1,
+    "Found the expected number of entries in the sources widget.");
+
+  isnot(gSources.selectedValue, null,
+    "There should be a selected source value.");
+  isnot(gEditor.getText().length, 0,
+    "The source editor should have some text displayed.");
+  isnot(gEditor.getText(), gDebugger.L10N.getStr("loadingText"),
+    "The source editor text should not be 'Loading...'");
+
+  is(gDebugger.document.querySelectorAll("#sources .side-menu-widget-empty-notice-container").length, 0,
+    "The sources widget should not display any notice at this point (1).");
+  is(gDebugger.document.querySelectorAll("#sources .side-menu-widget-empty-notice").length, 0,
+    "The sources widget should not display any notice at this point (2).");
+  is(gDebugger.document.querySelector("#sources .side-menu-widget-empty-notice > label"), null,
+    "The sources widget should not display a notice at this point (3).");
+
+  gDebugger.gThreadClient.resume(() => {
+    testLocationChange();
+  });
+}
+
+function testLocationChange() {
+  navigateActiveTabTo(gPanel, "about:blank", gDebugger.EVENTS.SOURCES_ADDED).then(() => {
+    closeDebuggerAndFinish(gPanel);
+  });
+}
+
+registerCleanupFunction(function() {
+  gTab = null;
+  gDebuggee = null;
+  gPanel = null;
+  gDebugger = null;
+  gEditor = null;
+  gSources = null;
+  gFrames = null;
+});