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.

• We confirm correct lifecycle behavior in test environment: initialization, dependency readiness, and graceful shutdown of app/modules.

GitHub Reference

• File: utils.spec.ts
• Line: 103

Setup Code

/* eslint-disable no-useless-escape */
import { Injectable } from '@nestjs/common';
import { IsNotEmpty } from 'class-validator';
import { ConfigModel, ConfigModelProperty } from '../config-model/decorators';
import { EnvModel, EnvModelProperty } from '../env-model/decorators';
import {
import { DefaultNestApplicationInitializer } from '../modules/system/default-nest-application/default-nest-application-initializer';
import { DefaultNestApplicationListener } from '../modules/system/default-nest-application/default-nest-application-listener';
import { InjectableFeatureConfigurationType } from '../nest-module/types';
import { createNestModule, getNestModuleDecorators } from '../nest-module/utils';
import { bootstrapNestApplication } from './utils';

describe('NestJS application: Utils', () => {
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  let originalExit: any;
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  let exitStatus: any;

  beforeAll(() => {
    originalExit = process.exit;
    process.exit = (status) => {
      exitStatus = status;
      return null as never;
    };
  });

  afterAll(() => {
    process.exit = originalExit;
  });

  afterEach(() => {
    exitStatus = null;
  });

  describe('NestJS application with env model', () => {

    // full test in the block below
  });

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

  });
  describe('NestJS application with anv and config model', () => {
  });
  describe('NestJS application with multi-providing options', () => {
  });
  describe('NestJS application get markdown of infrastructure', () => {
  });
});

Test Code

    it('should return option value from service of other module', async () => {
      @EnvModel()
      class App1Env {
        @EnvModelProperty()
        @IsNotEmpty()
        option!: string;
      }

      @Injectable()
      class App1Service {
        constructor(private readonly appEnv: App1Env) {}

        getEnv() {
          return this.appEnv;
        }
      }

      const { App1Module } = createNestModule({
        moduleName: 'App1Module',
        environmentsModel: App1Env,
        sharedProviders: [App1Service],
      });

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

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

      const { App2Module } = createNestModule({
        moduleName: 'App2Module',
        imports: [App1Module.forFeature()],
        providers: [App2Service],
      });

      process.env['TEST_APP_OPTION'] = 'value1';

      const app = await bootstrapNestApplication({
        project: { name: 'TestApp', description: 'Test application' },
        modules: {
          system: [DefaultNestApplicationInitializer.forRoot()],
          feature: [App1Module.forRoot({}), App2Module.forRoot()],
        },
      });

      const app2Service = app.get(App2Service);

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