Best practices for writing tests in Elixir include using the built-in ExUnit framework, structuring tests into contexts, and ensuring proper coverage with unit and integration tests. Utilize `assert` for clarity in expectations.

Writing tests in Elixir is essential for maintaining code quality and ensuring that your application behaves as expected. The built-in ExUnit framework provides a robust structure for writing and organizing tests. A best practice is to organize your tests into contexts, which align with the modules and features of your application. This makes it easier to locate and manage tests as your codebase grows. When writing tests, use descriptive names for your test cases to clearly indicate what functionality they are verifying. This improves readability and helps you quickly identify what is being tested. Utilize the assert function to clearly express expectations in your tests. This not only enhances clarity but also ensures that test failures are informative, providing context about what went wrong. Additionally, consider implementing both unit and integration tests to cover various aspects of your application. Unit tests focus on individual functions or modules, while integration tests verify that different parts of your application work together as intended. To further improve the reliability of your tests, incorporate fixtures and setup callbacks to prepare the necessary state before running tests. Finally, regularly run your test suite and monitor coverage to ensure that all critical paths are adequately tested. By following these best practices, you can create a comprehensive testing strategy that enhances the reliability and maintainability of your Elixir applications.