NestJS: Unit Test Joi Validation - node.js

Question

I'am new using Node and Nest framework, and I have a problem when testing modules that import a Custom Config Module that uses Joi to validate env vars:
yarn test
Test suite failed to run
Config validation error: "APP_PORT" is required
app-config.module.ts
#Module({
imports: [
ConfigModule.forRoot({
expandVariables: true,
load: [configuration],
validationSchema: Joi.object({
APP_PORT: Joi.number().required()
}),
}),
],
providers: [AppConfigService],
exports: [AppConfigService],
})
export class AppConfigModule { }
app.config.ts
import { registerAs } from '#nestjs/config';
export default registerAs('app', () => ({
env: process.env.NODE_ENV,
port: process.env.APP_PORT || 3000
...
}));
invoice.service.spec.ts
describe('InvoiceService', () => {
let service: InvoiceService;
beforeEach(async () => {
const module: TestingModule = await Test.createTestingModule({
imports: [
ConfigModule.forRoot({
load: [configuration],
ignoreEnvFile: true,
}),
AppConfigModule
],
providers: [
InvoiceService,
....
],
}).compile();
service = module.get<InvoiceService>(InvoiceService);
});
it('should be defined', () => {
expect(service).toBeDefined();
});
});
I use env file to deploy locally, and I only set up ignoreEnvFile: true in test class because env file is ignore from github repo, and project integrate github actions that run unit test.
How is the best way to solved this problem? I would not like add env file to repo.
Exist any way to disable/fake/mock Joi validation method. I saw some examples using setupFiles but I'm not sure if it's a good practice.

Answer 1

May you please show the package.json file?
you must have installed npm i --save #nestjs/config then create .env file inside root directory. Moreover you should import that into you app module.
import { Module } from '#nestjs/common';
import { ConfigModule } from '#nestjs/config';
#Module({
imports: [
ConfigModule.forRoot({
envFilePath: ".development.env",
}),
],
})
export class AppModule {}
Ref: https://docs.nestjs.com/techniques/configuration