Update MongoDB docs about directConnection

Author: BradLewis

packages/modules/mongodb/src/mongodb-container.test.ts

@@ -1,4 +1,4 @@
-import { MongoDBContainer, StartedMongoDBContainer } from "./mongodb-container";
+import { MongoDBContainer } from "./mongodb-container";
 import mongoose from "mongoose";
 
 describe("MongodbContainer", () => {
@@ -8,7 +8,26 @@ describe("MongodbContainer", () => {
   it("should work using default version 4.0.1", async () => {
     const mongodbContainer = await new MongoDBContainer().start();
 
-    await checkMongo(mongodbContainer);
+    // directConnection: true is required as the testcontainer is created as a MongoDB Replica Set.
+    const db = mongoose.createConnection(mongodbContainer.getConnectionString(), { directConnection: true });
+
+    // You can also add the default connection flag as a query parameter
+    // const connectionString = `${mongodbContainer.getConnectionString()}?directConnection=true`;
+    // const db = mongoose.createConnection(connectionString);
+
+    const fooCollection = db.collection("foo");
+    const obj = { value: 1 };
+
+    const session = await db.startSession();
+    await session.withTransaction(async () => {
+      await fooCollection.insertOne(obj);
+    });
+
+    expect(
+      await fooCollection.findOne({
+        value: 1,
+      }),
+    ).toEqual(obj);
 
     await mongoose.disconnect();
     await mongodbContainer.stop();
@@ -19,15 +38,13 @@ describe("MongodbContainer", () => {
   it("should work using version 6.0.1", async () => {
     const mongodbContainer = await new MongoDBContainer("mongo:6.0.1").start();
 
-    await checkMongo(mongodbContainer);
+    // directConnection: true is required as the testcontainer is created as a MongoDB Replica Set.
+    const db = mongoose.createConnection(mongodbContainer.getConnectionString(), { directConnection: true });
 
-    await mongoose.disconnect();
-    await mongodbContainer.stop();
-  });
-  // }
+    // You can also add the default connection flag as a query parameter
+    // const connectionString = `${mongodbContainer.getConnectionString()}?directConnection=true`;
+    // const db = mongoose.createConnection(connectionString);
 
-  async function checkMongo(mongodbContainer: StartedMongoDBContainer) {
-    const db = mongoose.createConnection(mongodbContainer.getConnectionString(), { directConnection: true });
     const fooCollection = db.collection("foo");
     const obj = { value: 1 };
 
@@ -39,7 +56,11 @@ describe("MongodbContainer", () => {
     expect(
       await fooCollection.findOne({
         value: 1,
-      })
+      }),
     ).toEqual(obj);
-  }
+
+    await mongoose.disconnect();
+    await mongodbContainer.stop();
+  });
+  // }
 });