build: Add CI for Result Poster Action

.github/action/result-poster/index.js

@@ -1,14 +1,14 @@
 const { Toolkit } = require('actions-toolkit')
 const { context, github } = new Toolkit({ event: 'check_suite' })
 
-const name = context.payload.check_suite.app.name;
+const name = context.payload.check_suite.app.name
 const conclusion = context.payload.check_suite.conclusion
-const sha = context.payload.check_suite.head_sha;
-const prs = context.payload.check_suite.pull_requests;
+const sha = context.payload.check_suite.head_sha
+const prs = context.payload.check_suite.pull_requests
 
 if (name === 'Google Cloud Build' && conclusion === 'success' && prs[0]) {
   github.issues.createComment(context.repo({
     number: prs[0].number,
-    body: `Preview at: https://storage.googleapis.com/staging.nodejs.dev/${sha.slice(0,7)}/index.html`
-  }));
+    body: `Preview at: https://storage.googleapis.com/staging.nodejs.dev/${sha.slice(0, 7)}/index.html`
+  }))
 }

.github/action/result-poster/package.json

@@ -4,8 +4,7 @@
   "description": "The WIP GitHub Action",
   "main": "index.js",
   "scripts": {
-    "pretest": "standard",
-    "test": "node test/smoke.js"
+    "test": "standard"
   },
   "repository": {
     "type": "git",

.github/workflows/result-poster-ci.yml

@@ -0,0 +1,30 @@
+name: CI for Result Poster GitHub Action
+
+on:
+  pull_request:
+    paths:
+    - ".github/workflows/result-poster-ci.yml"
+    - ".github/action/result-poster"
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+
+      - name: Install npm dependencies
+        run: |
+          cd .github/action/result-poster
+          npm ci
+
+      - name: Run tests
+        run: |
+          cd .github/action/result-poster
+          npm test