testing-vitest

To write NestJS and MikroORM integration tests with Vitest, you establish a real database connection and enforce transaction rollback for test isolation. This approach ensures data integrity by automatically rolling back database changes after each test case executes.

MikroORM test data persists across runs if transaction rollback is not enforced. Implementing a transaction rollback pattern wraps each test in a database transaction that is rolled back, ensuring complete test isolation and preventing data leakage between test suites.

Yes, you can test full API endpoint flows in NestJS using Vitest for end-to-end testing. This involves configuring the E2E testing environment to handle real database interactions, utilizing global setup for database seeding, and applying transaction rollbacks.

The best way to structure Vitest files for NestJS service layers involves separating test fixtures, generating DTOs accurately, and following strict naming conventions for describe and test blocks. This structured pattern ensures maintainable and readable integration tests.

Yes, Vitest global setup supports database seeding for MikroORM. You can configure the global setup file to initialize your database connection and seed necessary fixture data before executing your integration and end-to-end test suites.