__mocks__ icons.js

// __mocks__/icons.js

import path from 'path';
import fs from 'fs';

const svgRE = /\.svg$/

function getIcons(kind) {
  const files = {};
  
  function readDirectory(directory) {
    fs.readdirSync(directory).forEach((file) => {
      const fullPath = path.resolve(directory, file);

      if (fs.statSync(fullPath).isDirectory()) {
        readDirectory(fullPath);

        return;
      }

      if (!svgRE.test(fullPath)) return;

      const key = `${kind} ${file.replace(svgRE, '')}`;

      files[key] = key;
    });
  }

  return files;
}

export default {
  Line: getIcons('Line'),
  Solid: getIcons('Solid'),
};

icons.js

// icons.js

const lineIcons = require.context('../../assets/icons/Line', true, /.+\.svg$/);
const solidIcons = require.context('../../assets/icons/Solid', true, /.+\.svg$/);
const requireAll = requireContext => requireContext.keys().map(requireContext);
const toObjectNames = (state, icon) => ({ ...state, [icon.default.id]: icon.default.id });

export default {
  Line: requireAll(lineIcons).reduce(toObjectNames, {}),
  Solid: requireAll(solidIcons).reduce(toObjectNames, {}),
};