update with tests

src/main.ts

@@ -1,9 +1,16 @@
 import * as core from '@actions/core';
+import {wait} from './wait'
 
 async function run() {
   try {
-    const myInput = core.getInput('myInput');
-    core.debug(`Hello ${myInput}`);
+    const ms = core.getInput('milliseconds');
+    console.log(`Waiting ${ms} milliseconds ...`)
+
+    core.debug((new Date()).toTimeString())
+    wait(parseInt(ms));
+    core.debug((new Date()).toTimeString())
+
+    core.setOutput('time', new Date().toTimeString());
   } catch (error) {
     core.setFailed(error.message);
   }

src/wait.ts

@@ -0,0 +1,10 @@
+export function wait(milliseconds) {
+    return new Promise((resolve, reject) => {
+        if (typeof(milliseconds) !== 'number') { 
+        throw new Error('milleseconds not a number'); 
+        }
+
+        setTimeout(() => resolve("done!"), milliseconds)
+    });
+}
+