update to 4.0

test/spec_lib/util.js

@@ -0,0 +1,26 @@
+/*
+* test for rule replaceOption rule
+*
+*/
+const util = require('../../lib/util');
+
+describe('utils', () => {
+  it('should get some free ports', done => {
+    const count = 100;
+    const tasks = [];
+    for (let i = 1; i <= count; i++) {
+      tasks.push(util.getFreePort());
+    }
+    Promise.all(tasks)
+      .then((results) => {
+        // ensure ports are unique
+        const portMap = {};
+        results.map((portNumber) => {
+          portMap[portNumber] = true;
+        });
+        expect(Object.keys(portMap).length).toEqual(count);
+        done();
+      })
+      .catch(done.fail);
+  });
+});