update with tests

lib/wait.js

@@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+function wait(milliseconds) {
+    return new Promise((resolve, reject) => {
+        if (typeof (milliseconds) !== 'number') {
+            throw new Error('milleseconds not a number');
+        }
+        setTimeout(() => resolve("done!"), milliseconds);
+    });
+}
+exports.wait = wait;