diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_variables-view-frozen-sealed-nonext.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_variables-view-frozen-sealed-nonext.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,89 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * This test checks that we properly set the frozen, sealed, and non-extensbile
+ * attributes on variables so that the F/S/N is shown in the variables view.
+ */
+
+const TAB_URL = EXAMPLE_URL + "doc_frame-parameters.html";
+
+let gTab, gDebuggee, gPanel, gDebugger;
+
+function test() {
+  initDebugger(TAB_URL).then(([aTab, aDebuggee, aPanel]) => {
+    gTab = aTab;
+    gDebuggee = aDebuggee;
+    gPanel = aPanel;
+    gDebugger = gPanel.panelWin;
+
+    prepareTest();
+  });
+}
+
+function prepareTest() {
+  gDebugger.once(gDebugger.EVENTS.FETCHED_SCOPES, runTest);
+
+  gDebuggee.eval("(" + function() {
+    var frozen = Object.freeze({});
+    var sealed = Object.seal({});
+    var nonExtensible = Object.preventExtensions({});
+    var extensible = {};
+    var string = "foo bar baz";
+
+    debugger;
+  } + "())");
+}
+
+function runTest() {
+  let hasNoneTester = function(aVariable) {
+    ok(!aVariable.hasAttribute("frozen"),
+       "The variable should not be frozen.");
+    ok(!aVariable.hasAttribute("sealed"),
+       "The variable should not be sealed.");
+    ok(!aVariable.hasAttribute("non-extensible"),
+       "The variable should be extensible.");
+  };
+
+  let testers = {
+    frozen: function (aVariable) {
+      ok(aVariable.hasAttribute("frozen"),
+        "The variable should be frozen.");
+    },
+    sealed: function (aVariable) {
+      ok(aVariable.hasAttribute("sealed"),
+        "The variable should be sealed.");
+    },
+    nonExtensible: function (aVariable) {
+      ok(aVariable.hasAttribute("non-extensible"),
+        "The variable should be non-extensible.");
+    },
+    extensible: hasNoneTester,
+    string: hasNoneTester,
+    arguments: hasNoneTester,
+    this: hasNoneTester
+  };
+
+  let variables = gDebugger.document.querySelectorAll(".variable-or-property");
+
+  for (let variable of variables) {
+    let name = variable.querySelector(".name").getAttribute("value");
+    let tester = testers[name];
+    delete testers[name];
+
+    ok(tester, "We should have a tester for the '" + name + "' variable.");
+    tester(variable);
+  }
+
+  is(Object.keys(testers).length, 0,
+    "We should have run and removed all the testers.");
+
+  resumeDebuggerThenCloseAndFinish(gPanel);
+}
+
+registerCleanupFunction(function() {
+  gTab = null;
+  gDebuggee = null;
+  gPanel = null;
+  gDebugger = null;
+});