Question 1

How do I run elm-tests in my CI pipeline?

Accepted Answer

Use the node-test-runner or elm-test-rs CLI tools, which integrate into CI scripts and report results in standard formats. Incomplete runs from skip/only/todo are treated as failures to prevent committing gutted test suites.

Question 2

Can elm-test handle integration testing for my Elm app?

Accepted Answer

No, elm-test is designed only for unit and fuzz tests. The README recommends using external tools like Cypress or Capybara for integration or end-to-end testing outside the Elm ecosystem.

Question 3

How to write a fuzz test for a custom type in Elm?

Accepted Answer

Define custom fuzzers using the Fuzz module to generate random values for your type, then use the fuzz function in tests. This allows property-based testing across many inputs to validate invariants.

Question 4

elm-test vs using example-based testing in Elm docs?

Accepted Answer

elm-test provides executable, structured tests with assertions and random input generation, while example-based testing in docs is for documentation. Tools like elm-verify-examples can bridge this by extracting examples into elm-test suites.

Question 5

How to test HTML events like clicks in Elm with elm-test?

Accepted Answer

Use Test.Html.Event to simulate user interactions, combined with Test.Html.Query to select elements. This allows asserting on view changes or effects, as outlined in the README's application-specific techniques.

Question 6

Is elm-test good for beginners learning Elm?

Accepted Answer

While accessible, elm-test's focus on fuzz testing and type-safe design has a steeper learning curve for those new to property-based testing. It's best for developers already comfortable with Elm's fundamentals.

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