Refactor testing module for integration tests into re-usable function

src/modules/ad/tests/integration/ad.repository.spec.ts

@@ -1,61 +1,15 @@
-import {
-  AD_DIRECTION_ENCODER,
-  AD_MESSAGE_PUBLISHER,
-  AD_REPOSITORY,
-} from '@modules/ad/ad.di-tokens';
-import { AdMapper } from '@modules/ad/ad.mapper';
 import { AdEntity } from '@modules/ad/core/domain/ad.entity';
 import { CreateAdProps, Frequency } from '@modules/ad/core/domain/ad.types';
 import { AdRepository } from '@modules/ad/infrastructure/ad.repository';
 import { PrismaService } from '@modules/ad/infrastructure/prisma.service';
-import { PostgresDirectionEncoder } from '@modules/geography/infrastructure/postgres-direction-encoder';
+import { integrationTestingModule } from './integration.setup';
-import { ConfigModule } from '@nestjs/config';
-import { EventEmitterModule } from '@nestjs/event-emitter';
-import { Test } from '@nestjs/testing';
 
 describe('Ad Repository', () => {
   let prismaService: PrismaService;
   let adRepository: AdRepository;
 
-  const mockMessagePublisher = {
-    publish: jest.fn().mockImplementation(),
-  };
-
-  const mockLogger = {
-    log: jest.fn(),
-    warn: jest.fn(),
-    error: jest.fn(),
-  };
-
   beforeAll(async () => {
-    const module = await Test.createTestingModule({
+    ({ prismaService, adRepository } = await integrationTestingModule());
-      imports: [
-        EventEmitterModule.forRoot(),
-        ConfigModule.forRoot({ isGlobal: true }),
-      ],
-      providers: [
-        PrismaService,
-        AdMapper,
-        {
-          provide: AD_REPOSITORY,
-          useClass: AdRepository,
-        },
-        {
-          provide: AD_MESSAGE_PUBLISHER,
-          useValue: mockMessagePublisher,
-        },
-        {
-          provide: AD_DIRECTION_ENCODER,
-          useClass: PostgresDirectionEncoder,
-        },
-      ],
-    })
-      // disable logging
-      .setLogger(mockLogger)
-      .compile();
-
-    prismaService = module.get<PrismaService>(PrismaService);
-    adRepository = module.get<AdRepository>(AD_REPOSITORY);
   });
 
   afterAll(async () => {

src/modules/ad/tests/integration/integration.setup.ts

@@ -0,0 +1,57 @@
+import {
+  AD_DIRECTION_ENCODER,
+  AD_MESSAGE_PUBLISHER,
+  AD_REPOSITORY,
+} from '@modules/ad/ad.di-tokens';
+import { AdMapper } from '@modules/ad/ad.mapper';
+import { AdRepository } from '@modules/ad/infrastructure/ad.repository';
+import { PrismaService } from '@modules/ad/infrastructure/prisma.service';
+import { PostgresDirectionEncoder } from '@modules/geography/infrastructure/postgres-direction-encoder';
+import { ConfigModule } from '@nestjs/config';
+import { EventEmitterModule } from '@nestjs/event-emitter';
+import { Test } from '@nestjs/testing';
+
+export async function integrationTestingModule(): Promise<{
+  prismaService: PrismaService;
+  adRepository: AdRepository;
+}> {
+  const mockMessagePublisher = {
+    publish: jest.fn().mockImplementation(),
+  };
+
+  const mockLogger = {
+    log: jest.fn(),
+    warn: jest.fn(),
+    error: jest.fn(),
+  };
+
+  const module = await Test.createTestingModule({
+    imports: [
+      EventEmitterModule.forRoot(),
+      ConfigModule.forRoot({ isGlobal: true }),
+    ],
+    providers: [
+      PrismaService,
+      AdMapper,
+      {
+        provide: AD_REPOSITORY,
+        useClass: AdRepository,
+      },
+      {
+        provide: AD_MESSAGE_PUBLISHER,
+        useValue: mockMessagePublisher,
+      },
+      {
+        provide: AD_DIRECTION_ENCODER,
+        useClass: PostgresDirectionEncoder,
+      },
+    ],
+  })
+    .setLogger(mockLogger)
+    .compile();
+
+  return {
+    prismaService: module.get<PrismaService>(PrismaService),
+    adRepository: module.get<AdRepository>(AD_REPOSITORY),
+  };
+}