Sync LMS backend source

src/app.service.spec.ts

@@ -0,0 +1,35 @@
+import { AppService } from './app.service';
+import { PrismaService } from './prisma/prisma.service';
+
+describe('AppService', () => {
+  let service: AppService;
+  let prisma: Pick<PrismaService, '$queryRaw'>;
+
+  beforeEach(() => {
+    prisma = {
+      $queryRaw: jest.fn().mockResolvedValue([{ '?column?': 1 }]),
+    } as Pick<PrismaService, '$queryRaw'>;
+    service = new AppService(prisma as PrismaService);
+  });
+
+  it('returns the root service status', () => {
+    expect(service.getRoot()).toEqual({
+      service: 'lms-be',
+      status: 'ok',
+    });
+  });
+
+  it('returns a health payload', () => {
+    expect(service.getHealth()).toMatchObject({
+      status: 'ok',
+    });
+  });
+
+  it('checks database health', async () => {
+    await expect(service.getDatabaseHealth()).resolves.toMatchObject({
+      status: 'ok',
+      provider: 'postgresql',
+    });
+    expect(prisma.$queryRaw).toHaveBeenCalled();
+  });
+});