Elixir
Phoenix LiveView's test module gives you a full server-side rendering environment without a browser. This post covers mounting views, simulating user interactions, testing navigation, form submission, JS hook callbacks, and real-time push events — all in fast, deterministic ExUnit tests. LiveView moved the rendering loop to the
Elixir
Wallaby is an Elixir browser testing library that drives real browsers through WebDriver. Where Phoenix.LiveViewTest tests the server side without a browser, Wallaby tests the complete stack — JavaScript execution, CSS animations, WebSocket connections, and real browser rendering. It's the closest you get to testing what users actually
Elixir
Excoveralls generates test coverage reports for Elixir projects. It integrates with Coveralls.io for PR coverage comments, generates HTML reports for local review, and produces LCOV format for other coverage tools. Setting up coverage reporting early helps maintain quality as your Phoenix application grows. Installation # mix.exs def project do
Testing
Phoenix.LiveViewTest and Phoenix.ConnTest test your application logic without a browser. For acceptance tests that verify the full user experience — JavaScript behavior, CSS-driven interactions, and visual rendering — you need real browser automation. Wallaby provides this for Elixir, integrating tightly with ExUnit and supporting concurrent test execution. What Wallaby
Testing
Phoenix applications expose their behavior through HTTP endpoints. Testing these endpoints — verifying correct status codes, response bodies, redirects, and authentication — is essential for confident Phoenix development. Phoenix.ConnTest provides exactly this capability, letting you exercise your controllers without starting an actual HTTP server. What Phoenix.ConnTest Does Phoenix.ConnTest builds
Testing
Phoenix LiveView enables rich, real-time web interfaces without writing JavaScript. Testing LiveView requires a different approach than traditional controller tests because LiveView components are stateful, event-driven, and update asynchronously. The Phoenix.LiveViewTest module provides the tools to test these interactions deterministically. How LiveView Testing Works Phoenix.LiveViewTest mounts