Gain expertise in testing Elixir applications with ExUnit, unit testing principles, and integration with OTP, Phoenix, JSON APIs, and Ecto.

Test Your Web Applications with Elixir

Testing is an essential part of the software development life cycle. A good automated testing suite streamlines feedback, allowing rapid creation and tight control over specific application components.

This module is a comprehensive introduction to testing Elixir applications with ExUnit. We'll start with a review of unit testing principles before diving into writing tests with ExUnit. We’ll build a comprehensive suite of unit tests before moving on to more advanced testing, including integration, end-to-end, and property-based testing. In addition to the core Elixir environment, we’ll develop tests for OTP, the Phoenix web framework, JSON APIs, and Ecto schematics. We’ll also explore refactoring, server rendering, and design strategies for different platforms.

By the end of this module, we’ll have gained expertise in unit testing Elixir applications with ExUnit and be ready to build robust, performant applications using Phoenix.

Ensuring Elixir Application Performance with Testing and ExUnit

Multiple tests are performed in a single `describe`.

Multiple tests are performed on a single feature of the application.


**(Select all that apply.)** Why do test failures can occur?

(Select all that apply.) Why do test failures can occur?

The test focuses on the data going in as parameters.

The test focuses on the data coming out (in other words, the response).

The teardown stage is to be performed after the response is obtained.

**(Select all that apply.)** When testing “pure” functions, what is NOT a practice?

(Select all that apply.) When testing “pure” functions, what is NOT a practice?

Adding additional parameters to an existing function

Converting an existing code into a pure function that is used as a dependency

Adding existing code as a separate well-tested private function

**(Select all that apply.)** What does refactoring code as a pure function involve?

(Select all that apply.) What does refactoring code as a pure function involve?

**(Select all that apply.)** What is NOT a common way to inject dependency in Elixir?

(Select all that apply.) What is NOT a common way to inject dependency in Elixir?

Take a short quiz to test your understanding of unit testing concepts.

Unit Tests

Integration and End-to-End Tests

Testing OTP

Testing Ecto Schemas

Testing Ecto Queries

Testing Phoenix

Property-Based Testing

Conclusion

Quiz on Unit Testing Skills