editor-plugins VS node-test-runner

There are a handful of plugins and extension for different editors, the majority of which can be found on an officially updated list within the Elm organization on Github. My editor of choice is VS Code, and the VS Code extension for Elm is an excellent tool for writing in Elm. It provides details on errors when saving, references to where a particular function or value is utilized, and access to function documentation on hover

To actually run the tests, however, there are currently two options. The first, as noted above, is node-test-runner, which is available from npm at elm-test. This utility will run the tests as defined in your Elm code, and return the results. There is a second option, elm-test-rs, which is written in Rust instead of Node. It has a handful of features that node-test-runner does not have, as well as some downsides (see the Github README for details), but in general both tools work very well for testing Elm code.