Injected HttpAdapterHost's http adapter is lost on testing module

[micalevisk]

Is there an existing issue for this?

• I have searched the existing issues

Current behavior

when injecting HttpAdapterHost, httpAdapter getter is returning undefined even tho the host does has ExpressAdapter instantiated on it

here's the print of httpAdapterHost value:

here's the print of httpAdapterHost.httpAdapter:

Testing module setup:

Minimum reproduction code

https://gitlab.com/micalevisk/nestjs-testing-http-adapter-host-issue

Steps to reproduce

git clone https://gitlab.com/micalevisk/nestjs-testing-http-adapter-host-issue
cd nestjs-testing-http-adapter-host-issue
npm ci
npm run test:e2e
# see the error

npm start 
# works fine

Expected behavior

the value of httpAdapterHost.httpAdapter of the injected HttpAdapterHost should be an instance of ExpressAdapter, not undefined. Like it is when using NestFactory.create()

Package

• I don't know. Or some 3rd-party package
• @nestjs/common
• @nestjs/core
• @nestjs/microservices
• @nestjs/platform-express
• @nestjs/platform-fastify
• @nestjs/platform-socket.io
• @nestjs/platform-ws
• @nestjs/testing
• @nestjs/websockets
• Other (see below)

Other package

No response

NestJS version

10.1.3

Packages versions

[System Information]
OS Version     : Linux 6.2
NodeJS Version : v18.15.0
NPM Version    : 9.6.6 

[Nest CLI]
Nest CLI Version : 10.1.11 

[Nest Platform Information]
platform-express version : 10.1.3
schematics version       : 10.0.2
testing version          : 10.1.3
common version           : 10.1.3
core version             : 10.1.3
cli version              : 10.1.11

Node.js version

No response

In which operating systems have you tested?

• macOS
• Windows
• Linux

Other

No response

[kamilmysliwiec]

#8076 (comment)