chore: fix auth in unified failpoint logic

test/tools/unified-spec-runner/entities.ts

@@ -1,4 +1,3 @@
-/* eslint-disable @typescript-eslint/no-non-null-assertion */
 import { expect } from 'chai';
 import { EventEmitter } from 'events';
 
@@ -362,7 +361,15 @@ export class FailPointMap extends Map<string, Document> {
  let address: string;
  if (addressOrClient instanceof MongoClient) {
  client = addressOrClient;
- address = client.topology!.s.seedlist.join(',');
+ address = client.topology?.s.seedlist.join(',');
+ if (client.topology?.s.credentials) {
+ if (
+ client.topology.s.credentials.mechanism === 'DEFAULT' ||
+ client.topology.s.credentials.mechanism.startsWith('SCRAM')
+ ) {
+ address = `${client.topology.s.credentials.username}:${client.topology.s.credentials.password}@${address}`;
+ }
+ }
  } else {
  // create a new client
  address = addressOrClient.toString();
@@ -516,7 +523,7 @@ export class EntitiesMap<E = Entity> extends Map<string, E> {
  const entity = this.get(key);
  if (!entity) {
  if (assertExists) throw new Error(`Entity '${key}' does not exist`);
- return;
+ return undefined;
  }
  if (NO_INSTANCE_CHECK.includes(type)) {
  // Skip constructor checks for interfaces.