Updated the test system

test/chainAsync.test.js

@@ -0,0 +1,22 @@
+const expect = require('expect');
+const {chainAsync} = require('./_30s.js');
+
+test('chainAsync is a Function', () => {
+  expect(chainAsync).toBeInstanceOf(Function);
+});
+
+test('Calls all functions in an array', () => {
+  chainAsync([
+    next => {
+      next();
+    },
+    next => {
+      (() => {
+        next();
+      })();
+    },
+    next => {
+      expect(true).toBeTruthy();
+    }
+  ]);
+});