add health tests; move utils to libs

src/modules/health/tests/unit/health.http.controller.spec.ts

@@ -0,0 +1,90 @@
+import { RepositoriesHealthIndicatorUseCase } from '@modules/health/core/usecases/repositories.health-indicator.usecase';
+import { HealthHttpController } from '@modules/health/interface/http-controllers/health.http.controller';
+import { HealthCheckResult, HealthCheckService } from '@nestjs/terminus';
+import { Test, TestingModule } from '@nestjs/testing';
+
+const mockHealthCheckService = {
+  check: jest
+    .fn()
+    .mockImplementationOnce(() => ({
+      status: 'ok',
+      info: {
+        repositories: {
+          status: 'up',
+        },
+      },
+      error: {},
+      details: {
+        repositories: {
+          status: 'up',
+        },
+      },
+    }))
+    .mockImplementationOnce(() => ({
+      status: 'error',
+      info: {},
+      error: {
+        repository:
+          "\nInvalid `prisma.$queryRaw()` invocation:\n\n\nCan't reach database server at `v3-db`:`5432`\n\nPlease make sure your database server is running at `v3-db`:`5432`.",
+      },
+      details: {
+        repository:
+          "\nInvalid `prisma.$queryRaw()` invocation:\n\n\nCan't reach database server at `v3-db`:`5432`\n\nPlease make sure your database server is running at `v3-db`:`5432`.",
+      },
+    })),
+};
+
+const mockRepositoriesHealthIndicatorUseCase = {
+  isHealthy: jest.fn(),
+};
+
+describe('Health Http Controller', () => {
+  let healthHttpController: HealthHttpController;
+
+  beforeAll(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        {
+          provide: HealthCheckService,
+          useValue: mockHealthCheckService,
+        },
+        {
+          provide: RepositoriesHealthIndicatorUseCase,
+          useValue: mockRepositoriesHealthIndicatorUseCase,
+        },
+        HealthHttpController,
+      ],
+    }).compile();
+
+    healthHttpController =
+      module.get<HealthHttpController>(HealthHttpController);
+  });
+
+  afterEach(async () => {
+    jest.clearAllMocks();
+  });
+
+  it('should be defined', () => {
+    expect(healthHttpController).toBeDefined();
+  });
+
+  it('should return an HealthCheckResult with Ok status ', async () => {
+    jest.spyOn(mockHealthCheckService, 'check');
+    jest.spyOn(mockRepositoriesHealthIndicatorUseCase, 'isHealthy');
+
+    const healthCheckResult: HealthCheckResult =
+      await healthHttpController.check();
+    expect(healthCheckResult.status).toBe('ok');
+    expect(mockHealthCheckService.check).toHaveBeenCalledTimes(1);
+  });
+
+  it('should return an HealthCheckResult with Error status ', async () => {
+    jest.spyOn(mockHealthCheckService, 'check');
+    jest.spyOn(mockRepositoriesHealthIndicatorUseCase, 'isHealthy');
+
+    const healthCheckResult: HealthCheckResult =
+      await healthHttpController.check();
+    expect(healthCheckResult.status).toBe('error');
+    expect(mockHealthCheckService.check).toHaveBeenCalledTimes(1);
+  });
+});