Testing in Elixir can be done using the built-in ExUnit framework, which provides features for writing and organizing tests. Use `mix test` to run your tests and get feedback.

Testing is a crucial aspect of software development, and Elixir offers robust tools for writing and managing tests through the ExUnit testing framework. By default, ExUnit is included with Elixir and provides a powerful, easy-to-use structure for defining tests. To start writing tests, create a test file in the test directory of your project, where you can use the defmodule and use ExUnit.Case constructs to define your test module. Within this module, you can define test cases using the test macro, where you specify the behavior you want to verify. ExUnit supports assertions through functions like assert and refute, enabling you to check expected outcomes against actual results. Additionally, you can organize your tests into groups using describe blocks for better structure and readability. The testing framework also provides hooks such as setup and teardown, allowing you to run code before or after tests, which is useful for preparing test data or cleaning up. Once your tests are written, you can run them using the command mix test, which will execute all tests and provide feedback on their results. By embracing testing practices with ExUnit, developers can ensure code quality and reliability, facilitating easier maintenance and refactoring.