🔗 How do I write Elixir tests?

Tests should be readable, often even more readable than the code itself. This article emphasizes guides for writing effective Elixir tests using the ExUnit framework. It advises on using the @subject module attribute for clearer test readability, grouping tests with describe blocks, and avoiding module mocking to keep tests performant.

The author prefers dependency injection for better testing practices, particularly with time-dependent functions. They also caution against using ex_machina factories, arguing that they complicate tests and can lead to unreliable results.

A significant highlight is property-based testing, shown to enhance reliability by validating numerous potential inputs.

The message is clear—following these guides improves not only test reliability but also the readability and maintainability of code.