### Add Tests in Each Layer:
- Create a new folder in the project for tests, usually named tests or test.
- Write tests for each of the packages (repository, service, handler) you have in your project.
- You can use the built-in Go testing package (testing) to write unit tests for your functions and methods.
- Make sure to cover various scenarios, including edge cases and error handling.
- Organize your tests in separate files, e.g., repository_test.go, service_test.go, and handler_test.go.
- Run these tests using the go test command to ensure they pass.
### Add Tests in Each Layer: