ExStub vs mox

ExStub

ExStub provides an easy way to stub a module and record the function calls on it. (by nsomar)

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mox

Mocks and explicit contracts in Elixir (by dashbitco)

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ExStub		mox
	Project
-	Mentions	6
8	Stars	1,293
-	Growth	1.2%
0.0	Activity	6.0
about 7 years ago	Latest Commit	about 1 month ago
Elixir	Language	Elixir
MIT License	License	Apache License 2.0

The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

ExStub

Posts with mentions or reviews of ExStub. We have used some of these posts to build our list of alternatives and similar projects.

We haven't tracked posts mentioning ExStub yet.
Tracking mentions began in Dec 2020.

mox

Posts with mentions or reviews of mox. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-04-18.

Dealing with random number in tests
1 project | /r/elixir | 5 Dec 2023
An Introduction to Mocking Tools for Elixir
7 projects | dev.to | 18 Apr 2023

Mox helps get around these issues by ensuring explicit contracts. Read Mocks and Explicit Contracts for more details.
How to ignore a child of a Supervisor not being able to start during tests?
3 projects | /r/elixir | 11 Jun 2022

In order to do this you may use mock (which is simple to use), mox (they have pretty compelling arguments why not to mock traditionally), or specifically for http requests, bypass.
Como testes ajudam a melhorar o design do código?
2 projects | dev.to | 20 May 2022
Elixir: Testando chamadas de uma API externa
4 projects | dev.to | 20 May 2022
8 Common Causes of Flaky Tests in Elixir
2 projects | dev.to | 4 Jan 2022

Your options are mock ets/persistent_term — after all, we don't need to test that these things do what they say (Erlang does that for us!) — or have the tests run synchronously. Prefer the former! Mox is a great choice for this sort of work.

What are some alternatives?

When comparing ExStub and mox you can also consider the following projects:

mock - Mocking library for Elixir language

ex_unit_fixtures - A library for defining modular dependencies (fixtures) for ExUnit tests.

meck - A mocking library for Erlang

ponos - ponos is a simple yet powerful load generator written in erlang

ex_machina - Create test data for Elixir applications

bypass - 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.

patch - Ergonomic Mocking for Elixir

faker - Faker is a pure Elixir library for generating fake data.

ElixirMock - Creates clean, concurrent, inspectable mocks from elixir modules

hound - Elixir library for writing integration tests and browser automation

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