dashbitco/mox

Health v2 · maintenance only

Flags: no_releases no_license

Adoption not part of the score

1401 stars · 78 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Mox is an Elixir library for defining concurrent mocks based on explicit behaviours (contracts). It enforces strict mocking principles so tests can run with async: true while stubbing behaviour implementations.

Use cases

• mock external API calls in Elixir tests
• define mocks based on behaviours instead of ad-hoc modules
• keep Elixir tests concurrent with async: true while mocking
• assert on function inputs using pattern matching instead of expectation rules
• enforce explicit contracts between application components
• swap real implementations with test doubles in test_helper.exs

When to choose

• you write Elixir applications and want reliable, concurrency-safe mocks
• you prefer behaviour-driven design with explicit contracts between modules
• you need mocks that support parallel test execution
• you want to avoid dynamically generated mock modules in tests

When to avoid

• you need ad-hoc or per-test dynamic mocking without defining behaviours
• you are not working in the Elixir/Erlang ecosystem
• you prefer expectation-based mocking libraries with complex verification rules

Facets

library · maturity stable

testing mocking testing developer-tools elixir jvm elixir behaviour-based-mocks concurrent-tests explicit-contracts

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