Testing

Coverage report tool for Elixir with coveralls.io integration.

A mocking framework for Erlang

Mocks and explicit contracts for Elixir

An ExUnit.Formatter that produces an XML report of the tests run in the project _build dir. It is a good fit with Jenkins test reporting plugin, for example.

A factory library by the creators of FactoryBot (née FactoryGirl)

Data generation and property-based testing for Elixir

A mocking library for the Elixir language. We use the Erlang meck library to provide module mocking functionality for Elixir. It uses macros in Elixir to expose the functionality in a convenient manner for integrating in Elixir tests.

Automatically run tests when files change

Ergonomic Mocking for Elixir Unit Testing

Bypass provides a quick way to create a custom plug that can be put in place instead of an actual HTTP server to return prebaked responses to client requests. This is helpful when you want to create a mock HTTP server and test how your HTTP client handles different types of server responses.

Mocks for Elixir functions

Build tool & plugin for generating Cobertura XML reports

Automated contract testing for functions and mocks.

Run PropEr test suites

Gleam bindings to Erlang's EUnit test framework

A QuickCheck-inspired property-based testing tool for Erlang

Coveralls for Erlang

Concurrent feature tests for elixir

Simple mocking library for asynchronous testing.

Low-level WebDriver client for Elixir.

HTTP request/response recording library for elixir, inspired by VCR.

Helpful functions with great error messages to help you write better tests.

Execute PhoenixTest cases in an actual browser via Playwright.

Interactive test runner for mix test with watch mode.

Elixir client for the Playwright node.js server.

Make private functions public if Mix.env is :test

Literate test matchers for ExUnit

Automated accessibility testing for Elixir web applications using axe-core

Show status notifications for ExUnit test runs

Gherkin file parser for Elixir

Simplify and reduce test clutter when testing Telemetry events

Story BDD tool for executing elixir in ExUnit

Easy local cluster creation to aid in unit testing

A utility for defining eminently readable parameterized (or example-based) tests in ExUnit

PropCheck provides property based testing and is an Elixir layer around PropEr. It is also inspired by Quviq's QuickCheck Elixir library.

Mock third-party services in ExUnit

A package for automatic, comprehensive querying of Absinthe GraphQL schemas (for purposes of easily creating automatic testing setups).

Snapshot testing tool using familiar assertions

Lcov test coverage file generator.

Simple library to test LV components live in isolation

Simple macro for parameterized testing

A Murder of Crows

Better output for eunit suites

Common Test hooks for more readable logs

Rebar3 plugin converting .coverdata files to codecov compatible JSON

Webdriver library for integration testing and browser automation

Simple trace-based testing framework

A few sentences (a paragraph) describing the project.

ExUnit's assert on steroids that writes and updates tests for you

A library to declaratively write testable effects for asynchronous testing

BDD testing framework for Elixir inspired by RSpec.

🐦‍⬛ Snapshot testing in Gleam

Testcontainers is an Elixir library that supports ExUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

Wormwood is a tiny library to aid in testing GraphQL queries against an Absinthe schema. It allows you to test your query documents inside ExUnit test modules, and requires no HTTP requests to occur during testing.

With FakeServer you can create individual HTTP servers for each test case, allowing external requests to be tested without the need for mocks.

ExUnit assert helpers for testing rendered HTML.

Official Buildkite Test Analytics Collector

QuickCheck-inspired property testing with integrated shrinking

A utility module that helps you iterate faster on unit tests. This module lets execute specific tests from within a running iex shell to avoid needing to start and stop the whole application every time.

Double is a simple library to help build injectable dependencies for your tests. It does NOT override behavior of existing modules or functions.

Utilities for testing GraphQL APIs

GrpcMock is mocking library for [Elixir gRPC implementation](https://github.com/tony612/grpc-elixir). It provides seamless mock creation based on `pb.ex` definition and usual mocking "expect" - "verify" mechanisms.

Playwright is an Elixir library to automate Chromium, Firefox and WebKit browsers with a single API. Playwright delivers automation that is ever-green, capable, reliable and fast.

A mocking library particularly suitable for stateful property based testing.

Mutation testing plugin for rebar3

A testing utility for running snapshot tests

A mix task to run eunit tests, works for umbrella projects

Concurrent mocks for gRPC Elixir

Semantic similarity testing for Elixir with the wave operator <~>

Functions to wait for some condition in tests

Tool for mocking in tests

Generate a generic test execution file for SonarQube

A convenience library to spawn plug router with your application for testing purposes

The library outputs test results to the console, which helps speed up the red-green test correction cycle (inspired by rspec)

Real-time Buildkite annotations for ExUnit test failures

Macros to support assertions/refutations that might not be correct immediately but will eventually become so due to, say, eventual consistency.

ESpec for Phoenix web framework.

Pretty EUnit test formatters

Lightweight server-side integration test functions for Phoenix. Optimized for Elixir Pipes and the existing Phoenix.ConnTest framework to emphasize both speed and readability.

A simplified method for configuring modules to be mockable with Mox in Elixir projects.

Create Graphql StreamData generator from an Absinthe schema

Triq (Term Reductive Invariant Questant) QuickCheck

ArchUnit-inspired architecture testing library for Elixir. Write ExUnit tests that enforce dependency rules, layered architecture, modulith bounded contexts, and naming conventions.

Simulate remote HTTP services with local Bandit servers.

Isolate your tests from the world with Walkman

TestParrot helps in stubbing unit tests for pure functions

Spin up dynamic clusters in ExUnit tests with no special setup necessary.

Registry to help create sandboxes for testing

HTMLTestHelpers provides function helpers for unit testing allowing easy assertions for HTML elements data queried by data-testid attribute.

Test factories for Ash resources.

Covertool Build Plugin for Cobertura XML reports

BDD-like syntax for ExUnit

Property-based testing and metamorphic testing combinator library for Gleam

Builds on the Mox pattern — generates behaviours and dispatch facades from `defcallback` declarations — and adds stateful test doubles powerful enough to test Ecto.Repo operations without a database.

Tapex is a TAP (Test Anything Protocol) formatter for ExUnit.

Fake Membrane sinks that drop incoming data

Language-agnostic mutation testing library for Elixir, Erlang, and other BEAM languages. Evaluates test suite quality by introducing deliberate bugs into code and verifying that tests catch them. Intelligent file filtering, 6 mutation strategies, parallel execution, multiple output formats.

A collection of goodies for the property-based testing framework PropEr

Power Assert in Elixir. Shows evaluation results each expression.

VCR-style record-and-replay library for Req HTTP client

Elixir implementation of the cucumber messages protobuf schema

Publicist allows developers to test private (defp) functions

A polite, well mannered and thoroughly upstanding testing framework for Elixir

Opinionated library for testing timer-based Elixir code

Cucumber for Elixir: BDD testing framework with Gherkin syntax