diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_iframes.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_iframes.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,67 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests that iframes can be added as debuggees.
+ */
+
+const TAB_URL = EXAMPLE_URL + "doc_iframes.html";
+
+function test() {
+  let gTab, gDebuggee, gPanel, gDebugger;
+  let gIframe, gEditor, gSources, gFrames;
+
+  initDebugger(TAB_URL).then(([aTab, aDebuggee, aPanel]) => {
+    gTab = aTab;
+    gDebuggee = aDebuggee;
+    gPanel = aPanel;
+    gDebugger = gPanel.panelWin;
+    gIframe = gDebuggee.frames[0];
+    gEditor = gDebugger.DebuggerView.editor;
+    gSources = gDebugger.DebuggerView.Sources;
+    gFrames = gDebugger.DebuggerView.StackFrames;
+
+    waitForSourceShown(gPanel, "inline-debugger-statement.html")
+      .then(checkIframeSource)
+      .then(checkIframePause)
+      .then(() => resumeDebuggerThenCloseAndFinish(gPanel))
+      .then(null, aError => {
+        ok(false, "Got an error: " + aError.message + "\n" + aError.stack);
+      });
+  });
+
+  function checkIframeSource() {
+    is(gDebugger.gThreadClient.paused, false,
+      "Should be running after starting the test.");
+
+    ok(isCaretPos(gPanel, 1),
+      "The source editor caret position was incorrect.");
+    is(gFrames.itemCount, 0,
+      "Should have only no frames.");
+
+    is(gSources.itemCount, 1,
+      "Found the expected number of entries in the sources widget.");
+    is(gEditor.getText().indexOf("debugger"), 348,
+      "The correct source was loaded initially.");
+    is(gSources.selectedValue, EXAMPLE_URL + "doc_inline-debugger-statement.html",
+      "The currently selected source value is incorrect (0).");
+    is(gSources.selectedValue, gSources.values[0],
+      "The currently selected source value is incorrect (1).");
+  }
+
+  function checkIframePause() {
+    // Spin the event loop before causing the debuggee to pause, to allow
+    // this function to return first.
+    executeSoon(() => gIframe.runDebuggerStatement());
+
+    return waitForCaretAndScopes(gPanel, 16).then(() => {
+      is(gDebugger.gThreadClient.paused, true,
+        "Should be paused after an interrupt request.");
+
+      ok(isCaretPos(gPanel, 16),
+        "The source editor caret position was incorrect.");
+      is(gFrames.itemCount, 1,
+        "Should have only one frame.");
+    });
+  }
+}