@zen-web-components/unit-test-helper/karma.js

A test helper for mocha and native web components

const merge = require('deepmerge')

module.exports = createDefaultConfig => config => {
  config.set(
    merge(createDefaultConfig(config), {
      files: [
        { pattern: config.grep ? config.grep : 'test/**/*.test.js', type: 'module' },
      ],
      esm: {
        nodeResolve: true,
      },
    }),
  )

  return config
}