End-to-end testing in NestJS with TypeORM

Quality assurance is a critical component of software development, and the text focuses on implementing a quality assurance strategy through end-to-end testing in NestJS. The document emphasizes the importance of test-driven development (TDD), a methodology developed by Kent Beck in the late 1990s, which promotes writing tests before code to guide software development. NestJS, a framework for building server-side applications with TypeScript and dependency injection, facilitates testing by providing tools such as Jest and Supertest for unit and end-to-end tests. The text details the process of developing a product API using TDD, including setting up unit tests and creating an end-to-end testing suite for authentication controllers, to ensure that the application behaves as expected. This approach not only enhances the reliability of the application but also enables developers to catch bugs early in the development process, saving time and improving software quality. Additionally, the document highlights tools like LogRocket that help monitor user interactions and enhance digital experiences.