So siehts ganz gut aus !

node_modules/mqtt/test/store.js

@@ -0,0 +1,10 @@
+'use strict'
+
+var Store = require('../lib/store')
+var abstractTest = require('../test/abstract_store')
+
+describe('in-memory store', function () {
+  abstractTest(function (done) {
+    done(null, new Store())
+  })
+})