drivers-2922 downstream changes first pass

Author: aditi-khare-mongoDB

src/connection_string.ts

@@ -64,11 +64,6 @@ export async function resolveSRVRecord(options: MongoOptions): Promise<HostAddre
     throw new MongoAPIError('Option "srvHost" must not be empty');
   }
 
-  if (options.srvHost.split('.').length < 3) {
-    // TODO(NODE-3484): Replace with MongoConnectionStringError
-    throw new MongoAPIError('URI must include hostname, domain name, and tld');
-  }
-
   // Asynchronously start TXT resolution so that we do not have to wait until
   // the SRV record is resolved before starting a second DNS query.
   const lookupAddress = options.srvHost;

test/integration/initial-dns-seedlist-discovery/initial_dns_seedlist_discovery.prose.test.ts

@@ -0,0 +1,47 @@
+import { expect } from 'chai';
+import * as dns from 'dns';
+
+import { MongoClient } from '../../mongodb';
+import sinon = require('sinon');
+
+describe.only('Initial DNS Seedlist Discovery (Prose Tests)', () => {
+  function makeSrvStub() {
+    sinon.stub(dns.promises, 'resolveSrv').callsFake(async () => {
+      return [
+        {
+          name: 'localhost',
+          port: 27017,
+          weight: 0,
+          priority: 0
+        }
+      ];
+    });
+
+    sinon.stub(dns.promises, 'resolveTxt').callsFake(async () => {
+      throw { code: 'ENODATA' };
+    });
+  }
+
+  afterEach(async () => {
+    sinon.restore();
+  });
+
+  it('1.1 Driver should not throw error on SRV URI with two parts', async () => {
+    // 1. stub dns resolution to always pass
+    makeSrvStub();
+    // 2. assert that creating a MongoClient with the uri 'mongodb+srv://mongodb.localhost' does not cause an error
+    //const client = new MongoClient('mongodb+srv://mongodb.localhost', {});
+    const client = new MongoClient('mongodb+srv://mongodb.localhost');
+    // 3. assert that connecting the client from 2. to the server does not cause an error
+    await client.connect();
+  });
+
+  it('1.2 Driver should not throw error on SRV URI with one part', async () => {
+    // 1. stub dns resolution to always pass
+    makeSrvStub();
+    // 2. assert that creating a MongoClient with the uri 'mongodb+srv//localhost' does not cause an error
+    const client = new MongoClient('mongodb+srv://localhost', {});
+    // 3. assert that connecting the client from 2. to the server does not cause an error
+    await client.connect();
+  });
+});