Add test script for example; include it in CI job

.github/workflows/ci.yaml

@@ -22,3 +22,7 @@ jobs:
       - run: npm ci
       - run: npm run build
       - run: npm test
+      - working-directory: examples
+        run: npm run build
+      - working-directory: examples
+        run: npm test

examples/package.json

@@ -5,6 +5,7 @@
   "license": "ISC",
   "private": true,
   "scripts": {
-    "build": "../node_modules/.bin/rollup -c"
+    "build": "../node_modules/.bin/rollup -c",
+    "test": "sh test.sh"
   }
 }

examples/test.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+set -e
+
+node dist/factory.js | grep -q "factory { one: 'one', other: 'other' }" && echo "factory ok" || (echo "factory failed" && false)
+node dist/ponyfill.js | grep -q "ponyfill { one: 'one', othe: 'other' }" && echo "ponyfill ok" || (echo "ponyfill failed" && false)
+node dist/polyfill.js | grep -q "{ one: 'one', other: 'other' }" && echo "polyfill ok" || (echo "polyfill failed" && false)