connectMongoose testing ok

Author: pablo-sch

.gitignore

@@ -1 +1,2 @@
 node_modules/
+coverage/

nodeapp/lib/connectMongoose.test.js

@@ -0,0 +1,43 @@
+import connectMongoose from "./connectMongoose.js";
+import mongoose, { connection } from "mongoose";
+
+jest.mock("mongoose");
+
+describe("connectMongoose", () => {
+  /* 
+  //1.1 Versión Clasica. Conexión directa a MongoDB:
+  it("Deberia devolver una promesa  que resuelve una conexion", async () => {
+    const connection = await connectMongoose();
+    expect(connection).toBeDefined();
+    expect(connection.name).toBeDefined();
+    await connection.close();
+  });
+  */
+
+  mongoose.connect.mockResolvedValue({
+    connection: {
+      name: "mockName",
+      close: jest.fn(),
+    },
+  });
+
+  let connection;
+  beforeEach(async () => {
+    connection = await connectMongoose();
+  });
+
+  //1.2 Versión con mocks:
+  it("Deberia devolver una promesa  que resuelve una conexion", async () => {
+    //const connection = await connectMongoose();
+    expect(connection).toBeDefined();
+    expect(connection.name).toBeDefined();
+    await connection.close();
+  });
+
+  it("Deberia llamar a mongoose.connect al iniciar una conexion", async () => {
+    //const connection = await connectMongoose();
+    const spy = jest.spyOn(mongoose, "connect");
+    expect(spy).toHaveBeenCalled();
+    await connection.close();
+  });
+});

nodeapp/package.json

@@ -8,7 +8,8 @@
     "start": "cross-env NODEAPP_ENV=production node server.js",
     "initDB": "node initDB.js",
     "test": "jest",
-    "test:watch": "jest --watch"
+    "test:watch": "jest --watch",
+    "test:coverage": "jest --coverage --coverageDirectory=test-coverage"
   },
   "keywords": [],
   "author": "",