Build test for GET /groups API endpoint.

test/routes/groups.test.js

@@ -0,0 +1,31 @@
+import "dotenv/config";
+import express from "express";
+import mongoose from "mongoose";
+import request from "supertest";
+import router from "../../src/routes/groups.js";
+
+const app = express();
+
+app.use("/groups", router);
+
+// before all the route tests, connect to the database
+beforeAll(async () => {
+    await mongoose.connect(process.env.TEST_DB_CONNECTION, {
+        useNewUrlParser: true,
+        useUnifiedTopology: true,
+    });
+});
+
+// after all the test, close database connection
+afterAll(async () => {
+    await mongoose.connection.close();
+});
+
+// run tests againts the Groups endpoints by receiving the expected responses
+describe("Test the Groups endpoint(s)", () => {
+    // test for successful response to a GET request to /groups
+    test("GET /groups", async () => {
+        const response = await request(app).get("/groups");
+        expect(response.statusCode).toBe(200);
+    });
+});