Add comprehensive tests for role middleware and fix package dependencies

node_modules/chai/karma.conf.js

@@ -0,0 +1,34 @@
+module.exports = function(config) {
+  config.set({
+      frameworks: [ 'mocha' ]
+    , files: [
+          'chai.js'
+        , 'test/bootstrap/index.js'
+        , 'test/*.js'
+      ]
+    , reporters: [ 'progress' ]
+    , colors: true
+    , logLevel: config.LOG_INFO
+    , autoWatch: false
+    , browsers: [ 'HeadlessChrome' ]
+    , customLaunchers: {
+      HeadlessChrome: {
+      base: 'ChromeHeadless'
+    , flags: [ '--no-sandbox',]
+    , }
+    , }
+    , browserDisconnectTimeout: 10000
+    , browserDisconnectTolerance: 2
+    , browserNoActivityTimeout: 20000
+    , singleRun: true
+  });
+
+  switch (process.env.CHAI_TEST_ENV) {
+    case 'sauce':
+      require('./karma.sauce')(config);
+      break;
+    default:
+      // ...
+      break;
+  };
+};