EnvModel: Returns option value from service of other module

Overview

These tests validate nestjs-mod EnvModel: environment variable reading, required field validation, and DI value propagation into services.

What We Do And Verify

• We verify how configTransform and ConfigModel/ConfigModelProperty decorators process input parameters.

• We lock the validation contract and error shape expected by configuration consumers.

• We confirm that modules/services receive properly prepared configuration values.

• We explicitly validate the error contract: not only failure itself, but also error shape/content expected by module consumers.

GitHub Reference

• File: utils.spec.ts
• Line: 267

Setup Code

import { Injectable, Module } from '@nestjs/common';
import { Test, TestingModule } from '@nestjs/testing';
import { IsNotEmpty } from 'class-validator';
import { BehaviorSubject } from 'rxjs';
import { setTimeout } from 'timers/promises';
import { ConfigModel, ConfigModelProperty } from '../config-model/decorators';
import { EnvModel, EnvModelProperty } from '../env-model/decorators';
import { InjectableFeatureConfigurationType } from './types';
import { createNestModule, getNestModuleDecorators } from './utils';

describe('NestJS modules: Utils', () => {
  describe('NestJS modules with env model', () => {

  });

  describe('NestJS modules with config model', () => {

    // full test in the block below
  });
  describe('NestJS modules with anv and config model', () => {
  });
  describe('NestJS modules with multi-providing options', () => {
  });
  describe('NestJS modules with useObservable (configurationStream)', () => {
  });

  describe('NestJS modules with featureConfigurationClass', () => {

  });
});

Test Code

    it('should return option value from service of other module', async () => {
      @ConfigModel()
      class App1Config {
        @ConfigModelProperty()
        @IsNotEmpty()
        option!: string;
      }

      @Injectable()
      class App1Service {
        constructor(private readonly appConfig: App1Config) {}

        getConfig() {
          return this.appConfig;
        }
      }

      const { App1Module } = createNestModule({
        moduleName: 'App1Module',
        configurationModel: App1Config,
        sharedProviders: [App1Service],
      });
      const { InjectService } = getNestModuleDecorators({
        moduleName: 'App1Module',
      });

      @Injectable()
      class App2Service {
        constructor(
          @InjectService(App1Service)
          private readonly appService: App1Service,
        ) {}

        getConfig() {
          return this.appService.getConfig();
        }
      }

      @Module({
        imports: [App1Module.forFeature()],
        providers: [App2Service],
      })
      class App2Module {}

      const moduleRef: TestingModule = await Test.createTestingModule({
        imports: [App1Module.forRoot({ configuration: { option: 'value1' } }), App2Module],
      }).compile();
      const app2Service = moduleRef.get(App2Service);

      expect(app2Service.getConfig()).toMatchObject({ option: 'value1' });
    });