Elm Testing

Testing conventions for Elm using elm-test

Default

Language / Topic

Elm

Rules

Elm Testing · balanced balanced

- Use `elm-test` with `Test.describe` and `Test.test` to structure test suites and `Expect.equal` for assertions.

- Place tests in a `tests/` directory as separate Elm files — import production modules directly without any test-specific wrappers.

- Use `Fuzz.int`, `Fuzz.string`, and custom fuzzers with `Test.fuzz` for property-based testing of pure functions.

- Test `update` functions by passing a `Msg` and asserting on the returned `Model` and `Cmd` — use `Test.Extra` helpers if available.