test: harden business boundary conditions

apps/server/src/students/students.lifecycle.spec.ts

@@ -0,0 +1,43 @@
+import { BadRequestException, NotFoundException } from '@nestjs/common';
+import { StudentsService } from './students.service';
+
+function createService(repo: Record<string, jest.Mock>, organizationRepo = {}) {
+  return new StudentsService(
+    repo as never,
+    {} as never,
+    {} as never,
+    {} as never,
+    {} as never,
+    organizationRepo as never,
+  );
+}
+
+describe('StudentsService — archive lifecycle boundaries', () => {
+  it('rejects archiving an already archived student', async () => {
+    const repo = { findOne: jest.fn().mockResolvedValue({ id: 1, status: 'archived' }) };
+    await expect(createService(repo).remove(1)).rejects.toBeInstanceOf(BadRequestException);
+  });
+
+  it('rejects restoring a student that is not archived', async () => {
+    const repo = { findOne: jest.fn().mockResolvedValue({ id: 1, status: 'active' }) };
+    await expect(createService(repo).restore(1)).rejects.toBeInstanceOf(BadRequestException);
+  });
+
+  it('rejects an empty batch archive', async () => {
+    await expect(createService({}).batchRemove([])).rejects.toBeInstanceOf(BadRequestException);
+  });
+
+  it('rejects creating a student under a missing or archived organization', async () => {
+    const repo = { create: jest.fn(), save: jest.fn() };
+    const organizationRepo = { findOne: jest.fn().mockResolvedValue(null) };
+    await expect(
+      createService(repo, organizationRepo).create({ name: '张三', organizationId: 9 }),
+    ).rejects.toBeInstanceOf(BadRequestException);
+    expect(repo.save).not.toHaveBeenCalled();
+  });
+
+  it('returns not found for a missing student', async () => {
+    const repo = { findOne: jest.fn().mockResolvedValue(null) };
+    await expect(createService(repo).findOne(404)).rejects.toBeInstanceOf(NotFoundException);
+  });
+});