spec/javascripts/matchers.js


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export default {
  toHaveSpriteIcon: () => ({
    compare(element, iconName) {
      if (!iconName) {
        throw new Error('toHaveSpriteIcon is missing iconName argument!');
      }

      if (!(element instanceof HTMLElement)) {
        throw new Error(`${element} is not a DOM element!`);
      }

      const iconReferences = [].slice.apply(element.querySelectorAll('svg use'));
      const matchingIcon = iconReferences.find(reference => reference.getAttribute('xlink:href').endsWith(`#${iconName}`));
      const result = {
        pass: !!matchingIcon,
      };

      if (result.pass) {
        result.message = `${element.outerHTML} contains the sprite icon "${iconName}"!`;
      } else {
        result.message = `${element.outerHTML} does not contain the sprite icon "${iconName}"!`;

        const existingIcons = iconReferences.map((reference) => {
          const iconUrl = reference.getAttribute('xlink:href');
          return `"${iconUrl.replace(/^.+#/, '')}"`;
        });
        if (existingIcons.length > 0) {
          result.message += ` (only found ${existingIcons.join(',')})`;
        }
      }

      return result;
    },
  }),
};