Moving metro-net to vnaas and porting to 4.0

Change-Id: Id42bb247033087e5d28bcbab9db07d58e6364625
(cherry picked from commit 95c02bd391ad5eb8edeba00e81b851b97a6abbd1)
diff --git a/xos/gui/gulp_tasks/karma.js b/xos/gui/gulp_tasks/karma.js
new file mode 100755
index 0000000..9955d1a
--- /dev/null
+++ b/xos/gui/gulp_tasks/karma.js
@@ -0,0 +1,45 @@
+
+/*
+ * Copyright 2017-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+const path = require('path');
+
+const gulp = require('gulp');
+const karma = require('karma');
+
+gulp.task('karma:single-run', karmaSingleRun);
+gulp.task('karma:auto-run', karmaAutoRun);
+
+function karmaFinishHandler(done) {
+  return failCount => {
+    done(failCount ? new Error(`Failed ${failCount} tests.`) : null);
+  };
+}
+
+function karmaSingleRun(done) {
+  process.env.NODE_ENV = 'test';
+  const configFile = path.join(process.cwd(), 'conf', 'karma.conf.js');
+  const karmaServer = new karma.Server({configFile}, karmaFinishHandler(done));
+  karmaServer.start();
+}
+
+function karmaAutoRun(done) {
+  process.env.NODE_ENV = 'test';
+  const configFile = path.join(process.cwd(), 'conf', 'karma-auto.conf.js');
+  const karmaServer = new karma.Server({configFile}, karmaFinishHandler(done));
+  karmaServer.start();
+}