feat: generate health check test for daily.

.gitignore

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+.env
+node_modules

__tests__/health-check.js

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+const mysql = require("mysql2/promise");
+const redis = require("ioredis");
+
+const dotenv = require("dotenv");
+dotenv.config();
+
+describe("Health check", () => {
+  /* ---------------------- Gateway Server Health Check. ---------------------- */
+  it("should return OK if gateways server is healthy", async () => {
+    try {
+      const response = await fetch(process.env.GATEWAY_SERVER_URL + "/");
+      const data = await response.json();
+      expect(data.message).toEqual("ok");
+    } catch (error) {
+      console.error("Gateway server health check failed:", error);
+      throw error;
+    }
+  });
+
+  /* ------------------------- Ai Server Health Check. ------------------------ */
+  // it("should return OK from gateway and ai server both, if ai server is healthy", async () => {
+  //   try {
+  //     // from gateway
+  //     const gatewayResponse = await fetch(process.env.GATEWAY_SERVER_URL + "/ai");
+  //     const gatewayData = await gatewayResponse.json();
+  //     expect(gatewayData).toEqual("ok");
+  //     // from AI
+  //     const aiResponse = await fetch(process.env.AI_SERVER_URL + "/");
+  //     const aiData = await aiResponse.json();
+  //     expect(aiData.status).toEqual(200);
+  //   } catch (error) {
+  //     console.error("AI server health check failed:", error);
+  //     throw error;
+  //   }
+  // });
+
+  /* --------------------- MySQL Dev-Server Health Check. --------------------- */
+  it("should return OK if MySQL dev-server is healthy", async () => {
+    try {
+      const connection = await mysql.createConnection({
+        host: process.env.MYSQL_HOST,
+        user: process.env.MYSQL_USER,
+        password: process.env.MYSQL_PASSWORD,
+        database: process.env.MYSQL_DATABASE,
+      });
+
+      const [rows] = await connection.query("SELECT 1");
+      expect(rows).toEqual([{ 1: 1 }]);
+      await connection.end();
+    } catch (error) {
+      console.error("MySQL health check failed:", error);
+      throw error;
+    }
+  });
+
+  /* --------------------- Redis Dev-Server Health Check. --------------------- */
+  it("should return OK if Redis dev-server is healthy", async () => {
+    const client = redis.createClient({
+      host: process.env.REDIS_HOST,
+      password: process.env.REDIS_PASSWORD,
+      port: process.env.REDIS_PORT,
+    });
+
+    try {
+      await new Promise((resolve, reject) => {
+        client.on("connect", resolve);
+        client.on("error", reject);
+      });
+      expect(client.status).toEqual("connect");
+    } catch (error) {
+      console.error("Redis health check failed:", error);
+      throw error;
+    } finally {
+      await client.quit();
+    }
+  });
+});