Move treestatus.js to a model class.

Tools/GardeningServer/model/tree-status-tests.html

+<!--
+Copyright 2014 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+-->
+
+<link rel="import" href="tree-status.html">
+
+<script>
+
+(function () {
+
+module("tree-status");
+
+var openTreeJson = {
+    "username": "erg@chromium.org",
+    "date": "2013-10-14 20:22:00.887390",
+    "message": "Tree is open",
+    "can_commit_freely": true,
+    "general_state": "open"
+};
+
+var closedTreeJson = {
+    "username": "ojan@chromium.org",
+    "date": "2013-10-14 20:32:09.642350",
+    "message": "Tree is closed",
+    "can_commit_freely": false,
+    "general_state": "closed"
+};
+
+test('urlByName', 3, function() {
+    var treeStatus = new TreeStatus();
+    equal(treeStatus.urlByName('blink'), 'http://blink-status.appspot.com/');
+    equal(treeStatus.urlByName('chromium'), 'http://chromium-status.appspot.com/');
+    equal(treeStatus.urlByName('foo'), null);
+});
+
+asyncTest('fetchTreeStatus', 3, function() {
+    var simulator = new NetworkSimulator();
+
+    simulator.json = function(url)
+    {
+        if (url.indexOf('closed') != -1)
+            return Promise.resolve(closedTreeJson);
+        else
+            return Promise.resolve(openTreeJson);
+    };
+
+    var span = document.createElement('span');
+    simulator.runTest(function() {
+        var treeStatus = new TreeStatus();
+        treeStatus.fetchTreeStatus('http://opentree', span)
+            .then(function(result) {
+                equal(span.textContent, 'OPEN');
+
+                span = document.createElement('span');
+                treeStatus.fetchTreeStatus('http://closedtree', span)
+                    .then(function() {
+                        equal(span.textContent, 'Tree is closed by ojan@chromium.org');
+                        start();
+                    });
+            });
+    });
+});
+
+})();
+</script>