diff -r 000000000000 -r 6474c204b198 services/sync/tests/unit/test_collections_recovery.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/services/sync/tests/unit/test_collections_recovery.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,82 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Verify that we wipe the server if we have to regenerate keys.
+Cu.import("resource://services-sync/service.js");
+Cu.import("resource://services-sync/util.js");
+Cu.import("resource://testing-common/services/sync/utils.js");
+
+add_identity_test(this, function test_missing_crypto_collection() {
+  let johnHelper = track_collections_helper();
+  let johnU      = johnHelper.with_updated_collection;
+  let johnColls  = johnHelper.collections;
+
+  let empty = false;
+  function maybe_empty(handler) {
+    return function (request, response) {
+      if (empty) {
+        let body = "{}";
+        response.setStatusLine(request.httpVersion, 200, "OK");
+        response.bodyOutputStream.write(body, body.length);
+      } else {
+        handler(request, response);
+      }
+    };
+  }
+
+  yield configureIdentity({username: "johndoe"});
+
+  let handlers = {
+    "/1.1/johndoe/info/collections": maybe_empty(johnHelper.handler),
+    "/1.1/johndoe/storage/crypto/keys": johnU("crypto", new ServerWBO("keys").handler()),
+    "/1.1/johndoe/storage/meta/global": johnU("meta",   new ServerWBO("global").handler())
+  };
+  let collections = ["clients", "bookmarks", "forms", "history",
+                     "passwords", "prefs", "tabs"];
+  for each (let coll in collections) {
+    handlers["/1.1/johndoe/storage/" + coll] =
+      johnU(coll, new ServerCollection({}, true).handler());
+  }
+  let server = httpd_setup(handlers);
+  Service.serverURL = server.baseURI;
+
+  try {
+    let fresh = 0;
+    let orig  = Service._freshStart;
+    Service._freshStart = function() {
+      _("Called _freshStart.");
+      orig.call(Service);
+      fresh++;
+    };
+
+    _("Startup, no meta/global: freshStart called once.");
+    Service.sync();
+    do_check_eq(fresh, 1);
+    fresh = 0;
+
+    _("Regular sync: no need to freshStart.");
+    Service.sync();
+    do_check_eq(fresh, 0);
+
+    _("Simulate a bad info/collections.");
+    delete johnColls.crypto;
+    Service.sync();
+    do_check_eq(fresh, 1);
+    fresh = 0;
+
+    _("Regular sync: no need to freshStart.");
+    Service.sync();
+    do_check_eq(fresh, 0);
+
+  } finally {
+    Svc.Prefs.resetBranch("");
+    let deferred = Promise.defer();
+    server.stop(deferred.resolve);
+    yield deferred.promise;
+  }
+});
+
+function run_test() {
+  initTestLogging("Trace");
+  run_next_test();
+}