fix: enhance postgres health check

Coming from docker-library/docs#2393 (comment)

package.json

@@ -27,8 +27,10 @@
     "@playwright/test": "^1.48.2",
     "@types/ms": "^0.7.34",
     "@types/node": "^22.8.5",
+    "@types/pg": "^8.11.10",
     "@types/ws": "^8.5.12",
     "esbuild": "^0.24.0",
+    "pg": "^8.13.1",
     "typescript": "^5.6.3"
   },
   "dependencies": {

src/postgres.ts

@@ -10,7 +10,7 @@ export class Postgres {
       imageName: 'postgres:latest',
       ports: [POSTGRES_PORT],
       healthcheck: {
-        test: ['CMD-SHELL', 'pg_isready'],
+        test: ['CMD-SHELL', 'pg_isready', `--username=${user}`, `--host=localhost`, `--port=${POSTGRES_PORT}`, `--dbname=${db}`],
         intervalMs: ms('1s'),
         retries: 10,
         startPeriodMs: 0,

tests/postgres.spec.ts

@@ -0,0 +1,16 @@
+import { test } from '@playwright/test';
+import pg from 'pg';
+import { Postgres } from '../src/postgres.js';
+
+test('should work', async ({}) => {
+  const s = await Postgres.start({
+    user: 'foo',
+    password: 'bar',
+    db: 'postgres',
+  });
+  const client = new pg.Client(s.connectOptions());
+  await client.connect();
+  await client.query('SELECT 1');
+  await client.end();
+  await s.stop();
+})