fix test case of release idle connection

Author: qing-yang-20230331

README.md

@@ -131,6 +131,7 @@ const pool = mysql.createPool({
   waitForConnections: true,
   connectionLimit: 10,
   maxIdle: 10, // max idle connections, the default value is the same as `connectionLimit`
+  idleTimeout: 60000, // idle connections timeout, in milliseconds, the default value 60000
   queueLimit: 0
 });
 ```

index.d.ts

@@ -174,6 +174,8 @@ export interface ConnectionOptions extends mysql.ConnectionOptions {
   stream?: any;
   uri?: string;
   connectionLimit?: number;
+  maxIdle?: number;
+  idleTimeout?: number;
   Promise?: any;
   queueLimit?: number;
   waitForConnections?: boolean;

test/integration/test-pool-release-idle-connection.js

@@ -1,19 +1,16 @@
 'use strict';
 
-const mysql = require('../../index');
+const createPool = require('../common.js').createPool;
+const config = require('../common.js').config;
 const assert = require('assert');
 
-const poolConfig = {
-  host: 'localhost',
-  port: 3306,
-  user: 'root',
-  password: 'test',
-  connectionLimit: 10,
-  maxIdle: 1,
-  idleTimeout: 5000
-};
+const options = Object.assign({
+  connectionLimit: 5, // 5 connections
+  maxIdle: 1, // 1 idle connection
+  idleTimeout: 5000, // 5 seconds
+}, config);
+const pool = new createPool(options);
 
-const pool = new mysql.createPool(poolConfig);
 pool.getConnection((err1, connection1) => {
   assert.ifError(err1);
   assert.ok(connection1);

typings/mysql/lib/Pool.d.ts

@@ -26,6 +26,16 @@ declare namespace Pool {
          */
         connectionLimit?: number;
 
+        /**
+         * The minimum number of idle connections. (Default: 10)
+         */
+         maxIdle?: number;
+
+        /**
+         * The idle connections timeout, in milliseconds. (Default: 60000)
+         */
+         idleTimeout?: number;
+
         /**
          * The maximum number of connection requests the pool will queue before returning an error from getConnection. If set to 0, there
          * is no limit to the number of queued connection requests. (Default: 0)