NestJS class-validator is not the same in e2e testing mode

Bug Report

Seems like NestJS Class Validation is not behaving the same in testing environment (with supertest) and in dev/prod environment (axios, Postman).

With the above setting, every BaseDto’s property is required, and every PartialDto is optional.

This works correctly when requesting to NestJS application in dev/prod mode through tools such as axios, curl or Postman.

However, when testing it through NestJS’s e2e testing guide (eg. https://docs.nestjs.com/fundamentals/testing#end-to-end-testing), it appears to not behave the same as above.

My guess is that PartialType is not working correctly in testing mode. Thus, making PartialDto not partially required as it should be (TypeScript compilation problem?).

Current behavior

When requesting to endpoint with PartialDto, sending only firstName will be fine and returned 200.

However, doing the same with e2e testing will fail with the following error response:

 '{"statusCode":400,"message":["firstName must be a string"],"error":"Bad Request"}'

Input Code

Here is the reproduction Repo: https://github.com/kykungz/nest-test-issue

Try sending a request by running

yarn test:e2e

and compare it with using curl

curl --location --request POST 'http://localhost:5000' \
--header 'Content-Type: application/json' \
--data-raw '{
    "firstName": "[e-mail]"
}'

after starting the app (yarn start:dev)

Expected behavior

The e2e test should pass just like Postman and curl.

PartialDto should accept partial properties as it should be.

Possible Solution

Environment

Nest version: 7.4.1

 
For Tooling issues:
- Node version: v10.20.1 
- Platform:  Mac

Others:

[squid17]

Try just pass it manually in your e2e file

app = moduleFixture.createNestApplication();
app.useGlobalPipes(new ValidationPipe());
await app.init();

This works for me.

[kamilmysliwiec]

@jmcdo29 there’s a section about integrating the @nestjs/swagger/plugin too https://docs.nestjs.com/openapi/cli-plugin#integration-with-ts-jest-e2e-tests 😃