[WOC] add unit tests and opt express_pg_sequelize template

package.json

@@ -36,7 +36,10 @@
         "dotenv": "^16.4.7",
         "express": "^4.21.2",
         "jest": "^29.7.0",
+        "pg": "^8.16.3",
+        "pg-hstore": "^2.3.4",
         "prettier": "3.4.2",
+        "sequelize": "^6.37.7",
         "supertest": "^7.0.0",
         "vitepress": "^1.5.0"
     },

templates/express_pg_sequelize/.gitignore

@@ -0,0 +1,3 @@
+node_modules
+.env
+coverage

templates/express_pg_sequelize/app.test.js

@@ -0,0 +1,36 @@
+import { jest } from "@jest/globals";
+import request from "supertest";
+
+jest.unstable_mockModule("./db.js", () => ({
+    default: {
+        authenticate: jest.fn(() => Promise.resolve()),
+        query: jest.fn(() => Promise.resolve([[{ "now()": new Date() }], {}])),
+    },
+}));
+
+const { default: app } = await import("./index.js");
+const { default: db } = await import("./db.js");
+
+describe("express_pg_sequelize API Endpoints", () => {
+    it("should return welcome message on GET /", async () => {
+        const res = await request(app).get("/");
+        expect(res.statusCode).toEqual(200);
+        expect(res.text).toBe("Hello, Express with PostgreSQL!");
+    });
+
+    it("should return DB query results on GET /db-test", async () => {
+        const res = await request(app).get("/db-test");
+        expect(res.statusCode).toEqual(200);
+        expect(res.body.message).toBe("DB Query Successful!");
+        expect(res.body.data).toBeDefined();
+    });
+
+    it("should handle DB errors on GET /db-test", async () => {
+        db.query.mockImplementationOnce(() =>
+            Promise.reject(new Error("DB Error")),
+        );
+        const res = await request(app).get("/db-test");
+        expect(res.statusCode).toEqual(500);
+        expect(res.body.message).toBe("Error querying the database");
+    });
+});

templates/express_pg_sequelize/index.js

@@ -27,7 +27,7 @@ app.get("/db-test", async (req, res) => {
         const [results, metadata] = await db.query("SELECT NOW()");
         return res
             .status(200)
-            .json({ message: "DB query successful!", data: results });
+            .json({ message: "DB Query Successful!", data: results });
     } catch (error) {
         return res
             .status(500)
@@ -36,6 +36,10 @@ app.get("/db-test", async (req, res) => {
 });
 
 // Start the server
-app.listen(appConfig.PORT, () => {
-    console.log(`Server is running on http://localhost:${appConfig.PORT}`);
-});
+if (process.env.NODE_ENV !== "test") {
+    app.listen(appConfig.PORT, () => {
+        console.log(`Server is running on http://localhost:${appConfig.PORT}`);
+    });
+}
+
+export default app;

templates/express_pg_sequelize/package.json

@@ -4,8 +4,10 @@
     "main": "index.js",
     "scripts": {
         "start": "node index.js",
-        "dev": "nodemon index.js"
+        "dev": "nodemon index.js",
+        "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js"
     },
+    "type": "module",
     "dependencies": {
         "express": "^4.17.1",
         "pg": "^8.6.0",
@@ -14,6 +16,8 @@
         "dotenv": "^16.4.7"
     },
     "devDependencies": {
-        "nodemon": "^3.1.9"
+        "nodemon": "^3.1.9",
+        "jest": "^29.7.0",
+        "supertest": "^7.0.0"
     }
 }