[mocha] setup auto-release-sinon for server tests

test/mocha_setup.js

@@ -1 +1,31 @@
+var sinon = require('sinon');
+var autoRelease = require('auto-release-sinon');
+
 require('babel/register')(require('../src/optimize/babelOptions').node);
+
+var queuedAfterEachArgs = [];
+Object.defineProperty(global, 'afterEach', {
+  configurable: true,
+  get() { return undefined; },
+  set(afterEach) {
+    Object.defineProperty(global, 'afterEach', {
+      configurable: true,
+      writable: true,
+      value: afterEach
+    });
+
+    queuedAfterEachArgs.forEach(function (args) {
+      afterEach.apply(null, args);
+    });
+
+    return global.afterEach;
+  }
+});
+
+autoRelease.setupAutoRelease(sinon, function () {
+  if (!global.afterEach) {
+    queuedAfterEachArgs.push(Array.prototype.slice.call(arguments));
+  } else {
+    global.afterEach.apply(this, arguments);
+  }
+});