Recommend local rather than global install

[RGBboy]

I ran into an interesting problem where I wanted to run the tests of an existing elm library that had been set up to work with the previous version of elm-test but, because I had installed the latest version globally, was getting errors when trying to test. I have a good understanding of node and NPM so I was able to figure out the issue, however others may not be. I wonder if it would be better to recommend users to:

• Install this npm package locally and set up a local package.json file to document the version installed.
• Recommend consumers document how to run tests in their readme file.

Examples of the above could be provided here to make setting up elm test simple.

[RGBboy]

Also note that https://github.com/elm-community/elm-test currently recommends the global install too.

[razzeee]

I also wonder about this. As I'm currently tring to get this to work in this docker image https://github.com/bitwalker/alpine-elixir-phoenix via gitlab. And I don't think I can install globally due to the image enforcing correct user management.

@RGBboy any chance you can post how you were able to get this to run locally? Somehow I seem to not hit the correct parameters.

[razzeee]

Hrm npx elm-test seems to work flawless for me.

Edit: Nevermind, also fails on our CI with

Error extracting https://dl.bintray.com/elmlang/elm-test/0.18.12/linux-x64.tar.gz - Error: EACCES: permission denied, open '/opt/app/.npm/_npx/54/lib/node_modules/elm-test/bin/elm-interface-to-json'

[RGBboy]

@razzeee here is a project that I have elm-test setup locally: https://github.com/RGBboy/websocket-server. Essentially set it up as a node project too and add elm-test as a development dependency (npm install elm-test --dev). When you install node packages, it makes the {project}/node_modules/.bin available on the path when the current working directory is {project}. This means you have access to the local elm-test command.

I would structure it slightly differently now as the latest elm-test expects a test folder in the root of your project.