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

The **Phoenix** framework is really a combination of libraries:

- [Ranch](https://github.com/ninenines/ranch)
- [Cowboy](https://github.com/ninenines/cowboy)
- [Plug](https://github.com/elixir-plug/plug)
- [Phoenix](https://github.com/phoenixframework/phoenix)
- [Ecto](https://github.com/elixir-ecto/ecto)

This combination provides many tools to spin up web-server applications fairly easily, drawing on the history of many other frameworks. Still, it works very hard not to drive the design of our application. That ultimately means that a standard Phoenix application can be broken down into two main parts:

- The incoming web interface part (which includes Ranch, Cowboy, Plug, and Phoenix)

- The rest of the application (mostly Elixir and Ecto code).




A brief introduction to testing Phoenix-specific patterns and the role of Phoenix in our application. 

Introduction

A brief introduction to testing Phoenix-specific patterns and the role of Phoenix in our application.

Unit Tests

Integration and End-to-End Tests

Testing OTP

Testing Ecto Schemas

Testing Ecto Queries

Testing Phoenix

Property-Based Testing

Conclusion

Introduction