Testing Elixir APIs with ExUnit

Testing is a critical part of building reliable web services, yet setting up clean, isolated integration tests for APIs can often feel overwhelming. This text-only course guides you through the process of writing predictable, fast, and maintainable tests for your Elixir applications. You will transition from manual API verification to running automated, concurrent test suites with confidence. What you'll learn: - Understand the core concepts of ExUnit and the Elixir testing lifecycle - Structure API integration tests to verify HTTP responses, headers, and payloads - Manage database state and persistence safely using Ecto sandboxes and concurrent transactions - Configure test environments and leverage modern Elixir features like config runtimes - Mock external dependencies cleanly without compromising test isolation - Run and debug test suites efficiently using built-in ExUnit tooling and formatters Starting with foundational testing terminology and ExUnit mechanics, this course walks you through writing your first API test, managing database state, and handling complex asynchronous flows. You will read clear, step-by-step written explanations alongside practical code snippets designed to build your testing intuition. This course is designed for beginner to intermediate Elixir developers who want to establish a solid testing workflow for their APIs. No prior testing experience is required, though a basic familiarity with Elixir syntax and web development concepts is recommended. Start writing clean, reliable tests for your Elixir APIs today.