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apps/backend/src/users/tests/users.service.spec.ts

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+import { describe, expect, it } from 'vitest';
+import { ErrorCode } from '../../common/errors/error-codes';
+import { UsersService } from '../users.service';
+import type { AuditService } from '../../audit/audit.service';
+import type { RolesService } from '../../roles/roles.service';
+import type { SessionsService } from '../../sessions/sessions.service';
+import type { UsersRepository } from '../repositories/users.repository';
+import type { DataSource } from 'typeorm';
+
+describe('UsersService', () => {
+  it('blocks changes that would remove the last active admin', async () => {
+    const dataSource = {
+      getRepository: () => ({
+        createQueryBuilder: () => ({
+          innerJoin: () => ({
+            where: () => ({
+              andWhere: () => ({
+                andWhere: () => ({
+                  getCount: () => Promise.resolve(0),
+                }),
+              }),
+            }),
+          }),
+        }),
+      }),
+    } as unknown as DataSource;
+    const service = new UsersService(
+      {} as UsersRepository,
+      {} as RolesService,
+      {} as SessionsService,
+      {} as AuditService,
+      dataSource,
+    );
+
+    await expect(
+      service.assertAnotherActiveAdminRemains('user-1'),
+    ).rejects.toMatchObject({
+      code: ErrorCode.LastAdminRequired,
+    });
+  });
+});