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How to test NestJS Guards
- The article discusses the importance of testing strategies for NestJS Guards, which are often overlooked in many articles.
- The author aims to provide a deeper understanding of testing Guards in NestJS through a series of articles covering various strategies.
- The example scenario used in the article involves an application named 'WordWiz' with different subscription tiers and corresponding access levels.
- The approach involves creating integration tests for Guards, simulating endpoints with various subscription requirements.
- The Tests CAP Theorem is introduced, highlighting the balance between protection, speed, and maintainability in automated tests.
- Integration tests are recommended as a starting point to test the entire flow and decision-making process of Guards.
- The Humble Object pattern is employed to extract domain logic from Guards and test them in isolation for faster feedback.
- Efforts are made to balance between unit, integration, and e2e tests based on the characteristics of each type of test.
- The article concludes with a demonstration of e2e tests for endpoints with Guard implementation, ensuring access based on subscription levels.
- Overall, the article aims to provide a comprehensive approach to testing NestJS Guards, emphasizing reliability, maintainability, and clear testing strategies.
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