diff -r 000000000000 -r 6474c204b198 browser/experiments/test/xpcshell/test_upgrade.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/experiments/test/xpcshell/test_upgrade.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+Cu.import("resource:///modules/experiments/Experiments.jsm");
+
+const SEC_IN_ONE_DAY  = 24 * 60 * 60;
+const MS_IN_ONE_DAY   = SEC_IN_ONE_DAY * 1000;
+
+let cacheData = {
+  _enabled: true,
+  _manifestData: {
+    id: "foobartestid",
+    xpiURL: "http://example.com/foo.xpi",
+    xpiHash: "sha256:abcde",
+    startTime: 0,
+    endTime: 2000000000,
+    maxActiveSeconds: 40000000,
+    appName: "TestApp",
+    channel: "test-foo",
+  },
+  _needsUpdate: false,
+  _randomValue: 0.5,
+  _failedStart: false,
+  _name: "Foo",
+  _description: "Foobar",
+  _homepageURL: "",
+  _addonId: "foo@test",
+  _startDate: 0,
+  _endDate: 2000000000,
+  _branch: null
+};
+
+add_task(function* test_valid() {
+  let e = new Experiments.ExperimentEntry();
+  Assert.ok(e.initFromCacheData(cacheData));
+  Assert.ok(e.enabled);
+});
+
+add_task(function* test_upgrade() {
+  let e = new Experiments.ExperimentEntry();
+  delete cacheData._branch;
+  Assert.ok(e.initFromCacheData(cacheData));
+  Assert.ok(e.enabled);
+});
+
+add_task(function* test_missing() {
+  let e = new Experiments.ExperimentEntry();
+  delete cacheData._name;
+  Assert.ok(!e.initFromCacheData(cacheData));
+});
+
+function run_test() {
+  run_next_test();
+}