fix no-homogenous-tags: report homogenous example tags errors

src/rules/no-homogenous-tags.js

@@ -1,10 +1,12 @@
 const rule = 'no-homogenous-tags';
 const {
+  applyOver,
   compose,
   intoArray,
 } = require('../utils/generic');
 const {filter, map} = require('../utils/transducers');
-const {getScenarios} = require('../utils/selectors');
+const {getExamples, getScenarios} = require('../utils/selectors');
+const {flatMapScenarios} = require('../utils/gherkin');
 
 const groupTagsByName = (tags) => {
   return tags.reduce((set, {name}) => set.add(name), new Set());
@@ -17,19 +19,19 @@ const collectScenarioTagInfo = (info, {tags}) => {
   }, info);
 };
 
-const createErrorByFeature = (feature) => ([name, tagsInfo]) => {
+const createErrorByFeature = (feature, [parent, children]) => ([name, tagsInfo]) => {
   return {
     type: 'rule',
-    message: `${name} tag is declared in each scenario.` +
-      ' It could be defined at feature level.',
+    message: `${name} tag is declared in each ${children}.` +
+      ` It could be defined at ${parent} level.`,
     rule: rule,
     location: feature.location,
   };
 };
 
-const noHomogenousTags = (feature) => {
-  const createError = createErrorByFeature(feature);
-  const scenarios = getScenarios(feature);
+const noHomogenousTags = (getNodes, labels) => (feature) => {
+  const createError = createErrorByFeature(feature, labels);
+  const scenarios = getNodes(feature);
   const tagsInfo = scenarios.reduce(collectScenarioTagInfo, new Map());
   const {length} = scenarios;
   return intoArray(compose(
@@ -38,8 +40,13 @@ const noHomogenousTags = (feature) => {
   ))([...tagsInfo]);
 };
 
+const run = applyOver([
+  noHomogenousTags(getScenarios, ['feature', 'scenario']),
+  flatMapScenarios(noHomogenousTags(getExamples, ['scenario', 'example'])),
+]);
+
 module.exports = {
   name: rule,
-  run: noHomogenousTags,
+  run,
   isValidConfig: () => [],
 };

test/rules/no-homogenous-tags/HomogenousExampleTags.feature

@@ -0,0 +1,20 @@
+Feature: Feature with example homogenous tags
+
+Background:
+  Given I have a Background
+
+@tag1
+Scenario: This is a Scenario
+  Then this is a then step
+
+@tag3
+Scenario Outline: This is a Scenario Outline with the same tags
+  Then this is a then step <foo>
+@tag2
+Examples:
+  | foo |
+  | bar |
+@tag2
+Examples:
+  | foo |
+  | rab |

test/rules/no-homogenous-tags/Violations.feature → test/rules/no-homogenous-tags/HomogenousScenarioTags.feature

@@ -1,4 +1,4 @@
-Feature: Feature with homogenous tags
+Feature: Feature with scenario homogenous tags
 
 Background:
   Given I have a Background

test/rules/no-homogenous-tags/no-homogenous-tags.js

@@ -1,29 +1,40 @@
 const ruleName = 'no-homogenous-tags';
 const ruleTestBase = require('../rule-test-base');
 const rule = require('../../../src/rules/no-homogenous-tags.js');
-const runTest = ruleTestBase.createRuleTest(rule, ({tag}) =>
-  `${tag} tag is declared in each scenario. It could be defined at feature level.`);
+const runTest = ruleTestBase.createRuleTest(rule, ({tag, parent, children}) =>
+  `${tag} tag is declared in each ${children}. It could be defined at ${parent} level.`);
 
 describe('No Homogenous Tags Rule', function() {
   it('doesn\'t raise errors when there are no violations', function() {
     runTest('no-homogenous-tags/NoViolations.feature', {}, []);
   });
 
   it('detects errors for scenarios, and scenario outlines', function() {
-    runTest('no-homogenous-tags/Violations.feature', {}, [{
+    runTest('no-homogenous-tags/HomogenousScenarioTags.feature', {}, [{
       location: {
         line: 1,
         column: 1,
       },
       rule: ruleName,
-      messageElements: {tag: '@tag1'},
+      messageElements: {tag: '@tag1', children: 'scenario', parent: 'feature'},
     }, {
       location: {
         line: 1,
         column: 1,
       },
       rule: ruleName,
-      messageElements: {tag: '@tag2'},
+      messageElements: {tag: '@tag2', children: 'scenario', parent: 'feature'},
+    }]);
+  });
+
+  it('detects errors for examples', function() {
+    runTest('no-homogenous-tags/HomogenousExampleTags.feature', {}, [{
+      location: {
+        line: 11,
+        column: 1,
+      },
+      rule: ruleName,
+      messageElements: {tag: '@tag2', children: 'example', parent: 'scenario'},
     }]);
   });
 });