gherkin-lint/dist/rules/no-homogenous-tags.js

A Gherkin linter/validator written in javascript

"use strict";

const _ = require('lodash');

const rule = 'no-homogenous-tags';

function run(feature) {
  if (!feature) {
    return [];
  }

  let errors = []; // Tags that exist in every scenario and scenario outline 
  // should be applied on a feature level

  let childrenTags = [];
  feature.children.forEach(child => {
    if (child.scenario) {
      let scenario = child.scenario;
      childrenTags.push(getTagNames(scenario));
      let exampleTags = [];
      scenario.examples.forEach(example => {
        exampleTags.push(getTagNames(example));
      });

      const homogenousExampleTags = _.intersection(...exampleTags);

      if (homogenousExampleTags.length) {
        errors.push({
          message: 'All Examples of a Scenario Outline have the same tag(s), ' + 'they should be defined on the Scenario Outline instead: ' + homogenousExampleTags.join(', '),
          rule: rule,
          line: scenario.location.line
        });
      }
    }
  });

  const homogenousTags = _.intersection(...childrenTags);

  if (homogenousTags.length) {
    errors.push({
      message: 'All Scenarios on this Feature have the same tag(s), ' + 'they should be defined on the Feature instead: ' + homogenousTags.join(', '),
      rule: rule,
      line: feature.location.line
    });
  }

  return errors;
}

function getTagNames(node) {
  return _.map(node.tags, tag => tag.name);
}

module.exports = {
  name: rule,
  run: run
};