Unit script ignores configured postcss plugins

[Spittal]

I've configured and am using postcss-smart-import to help with my CSS imports. This works beautifully with both the dev and build scripts defined in the package.json however when I attempt to run the unit script it fails and complains about modules not being resolved.

The error is several iterations of this:

ERROR in ./~/css-loader?{"minimize":false}!./src/shared/style-base/index.css
Module not found: Error: Can't resolve './colors' in '/Users/jamie/web/terraforming-mars-tools/src/shared/style-base'
 @ ./~/css-loader?{"minimize":false}!./src/shared/style-base/index.css 3:10-94
 @ ./src/shared/style-base/index.css
 @ ./src ^\.\/(?!main(\.js)?$)
 @ ./test/unit/index.js

I can work around this by using relative paths. For example if I wanted to include normalize.css I would have to use the following code:

@import url('../../../node_modules/normalize.css/normalize.css');

I just updated to the new .postcssrc syntax, and here is my configuration:

// https://github.com/michael-ciniawsky/postcss-load-config

module.exports = {
  "plugins": {
    // to edit target browsers: use "browserlist" field in package.json
    "postcss-smart-import": {
      "path": ["src"]
    },
    "postcss-cssnext": {},
  }
}

Thanks for reading and let me know if I can provide more details.

The app I'm working on is open source you can see it here: https://gitlab.com/Spittal/terraforming-mars-tools/tree/master

[dimirc]

Maybe its related to an issue I'm also having when running unit too #563 (comment)

[LinusBorg]

Closing in favor of #1021