improve tests

src/modules/health/domain/usecases/prisma.health-indicator.usecase.ts

@@ -4,7 +4,7 @@ import {
   HealthIndicator,
   HealthIndicatorResult,
 } from '@nestjs/terminus';
-import { UsersRepository } from 'src/modules/user/adapters/secondaries/users.repository';
+import { UsersRepository } from '../../../user/adapters/secondaries/users.repository';
 
 @Injectable()
 export class PrismaHealthIndicatorUseCase extends HealthIndicator {

src/modules/health/tests/unit/messager.spec.ts

@@ -41,7 +41,7 @@ describe('Messager', () => {
 
   it('should publish a message', async () => {
     jest.spyOn(mockAmqpConnection, 'publish');
-    messager.publish('user.create.info', 'my-test');
+    messager.publish('test.create.info', 'my-test');
     expect(mockAmqpConnection.publish).toHaveBeenCalledTimes(1);
   });
 });

src/modules/health/tests/unit/prisma.health-indicator.usecase.spec.ts

@@ -0,0 +1,58 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { PrismaHealthIndicatorUseCase } from '../../domain/usecases/prisma.health-indicator.usecase';
+import { UsersRepository } from '../../../user/adapters/secondaries/users.repository';
+import { PrismaClientKnownRequestError } from '@prisma/client/runtime';
+import { HealthCheckError, HealthIndicatorResult } from '@nestjs/terminus';
+
+const mockUsersRepository = {
+  healthCheck: jest
+    .fn()
+    .mockImplementationOnce(() => {
+      return Promise.resolve(true);
+    })
+    .mockImplementation(() => {
+      throw new PrismaClientKnownRequestError('Service unavailable', {
+        code: 'code',
+        clientVersion: 'version',
+      });
+    }),
+};
+
+describe('PrismaHealthIndicatorUseCase', () => {
+  let prismaHealthIndicatorUseCase: PrismaHealthIndicatorUseCase;
+
+  beforeAll(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        {
+          provide: UsersRepository,
+          useValue: mockUsersRepository,
+        },
+        PrismaHealthIndicatorUseCase,
+      ],
+    }).compile();
+
+    prismaHealthIndicatorUseCase = module.get<PrismaHealthIndicatorUseCase>(
+      PrismaHealthIndicatorUseCase,
+    );
+  });
+
+  it('should be defined', () => {
+    expect(prismaHealthIndicatorUseCase).toBeDefined();
+  });
+
+  describe('execute', () => {
+    it('should check health successfully', async () => {
+      const healthIndicatorResult: HealthIndicatorResult =
+        await prismaHealthIndicatorUseCase.isHealthy('prisma');
+
+      expect(healthIndicatorResult['prisma'].status).toBe('up');
+    });
+
+    it('should throw an error if database is unavailable', async () => {
+      await expect(
+        prismaHealthIndicatorUseCase.isHealthy('prisma'),
+      ).rejects.toBeInstanceOf(HealthCheckError);
+    });
+  });
+});