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.github/workflows/test.yml

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+name: "Run JavaScript Action"
+on: [pull_request, push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+
+    - run: npm ci
+    - run: npm test
+    - uses: .
+      with: 
+        milliseconds: 1000

actions.yml

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+name: 'Wait'
+description: 'Wait a designated number of milliseconds'
+inputs:
+  milliseconds:  # id of input
+    description: 'number of milliseconds to wait'
+    required: true
+    default: '1000'
+outputs:
+  time: # output will be available to future steps 
+    description: 'The message to output'
+runs:
+  using: 'node12'
+  main: 'index.js'

index.js

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+const core = require('@actions/core');
+const wait = require('./wait');
+
+async function run() {
+  try { 
+    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);
+  }
+}
+
+run()

index.test.js

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+const wait = require('./wait');
+const process = require('process');
+const cp = require('child_process');
+const path = require('path');
+
+test('throws invalid number', async() => {
+    await expect(wait('foo')).rejects.toThrow('milleseconds not a number');
+});
+
+test('wait 500 ms', async() => {
+    const start = new Date();
+    await wait(500);
+    const end = new Date();
+    var delta = Math.abs(end - start);
+    expect(delta).toBeGreaterThan(450);
+});
+
+// shows how the runner will run a javascript action with env / stdout protocol
+test('test runs', () => {
+    process.env['INPUT_MILLISECONDS'] = 500;
+    const ip = path.join(__dirname, 'index.js');
+    console.log(cp.execSync(`node ${ip}`).toString());
+})

package.json

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+{
+  "name": "javascript-action",
+  "version": "1.0.0",
+  "description": "JavaScript Action Template",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/actions/javascript-action.git"
+  },
+  "keywords": [
+    "GitHub",
+    "Actions",
+    "JavaScript"
+  ],
+  "author": "GitHub",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/actions/javascript-action/issues"
+  },
+  "homepage": "https://github.com/actions/javascript-action#readme",
+  "dependencies": {
+    "@actions/core": "^1.1.0"
+  },
+  "devDependencies": {
+    "jest": "^24.9.0"
+  }
+}

wait.js

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+let wait = function(milliseconds) {
+  return new Promise((resolve, reject) => {
+    if (typeof(milliseconds) !== 'number') { 
+      throw new Error('milleseconds not a number'); 
+    }
+
+    setTimeout(() => resolve("done!"), milliseconds)
+  });
+}
+
+module.exports = wait;