Elixir Testing Rules

ExUnit testing best practices involve avoiding control flow in test bodies, asserting against concrete values, focusing on one assertion per test, and testing the domain contract to ensure reliability and maintainability.

To avoid brittle Elixir tests, prefer using real code implementations over mocks. This approach ensures your tests verify actual behavior and domain contracts rather than just structural shapes or mock interactions.

You should adhere to the Highlander Rule for ExUnit tests by focusing on one assertion per test. This practice prevents hidden failures and ensures your tests remain clear, deterministic, and easy to maintain.

When generating test data for ExUnit suites, you should use globally unique values. This strict rule prevents state leakage between tests and ensures your Elixir test suite remains deterministic and isolated.

You should avoid control flow in Elixir test bodies to promote clear, straight-line test execution. Removing conditional logic from tests prevents hidden failures and makes test logic easier to follow and maintain.

To align Elixir tests with specifications, ensure your tests verify the domain contract defined by any existing specs. This guarantees your tests accurately enforce the intended behavior and constraints of the codebase.