feat(audit): add lang query paramenter to help urls

lib/core/base/audit.js

@@ -37,6 +37,7 @@ function Audit(audit) {
 	this.brand = 'axe';
 	this.application = 'axeAPI';
 	this.tagExclude = ['experimental'];
+	this.lang = 'en';
 
 	this.defaultConfig = audit;
 	this._init();
@@ -60,7 +61,8 @@ Audit.prototype._setDefaultLocale = function() {
 
 	const locale = {
 		checks: {},
-		rules: {}
+		rules: {},
+		lang: this.lang
 	};
 
 	// XXX: unable to use `for-of` here, as doing so would
@@ -223,6 +225,10 @@ Audit.prototype.applyLocale = function(locale) {
 	if (locale.rules) {
 		this._applyRuleLocale(locale.rules);
 	}
+
+	if (locale.lang) {
+		this.lang = locale.lang;
+	}
 };
 
 /**
@@ -642,7 +648,7 @@ Audit.prototype.setBranding = function(branding) {
 /**
  * For all the rules, create the helpUrl and add it to the data for that rule
  */
-function getHelpUrl({ brand, application }, ruleId, version) {
+function getHelpUrl({ brand, application, lang }, ruleId, version) {
 	return (
 		axe.constants.helpUrlBase +
 		brand +
@@ -651,7 +657,8 @@ function getHelpUrl({ brand, application }, ruleId, version) {
 		'/' +
 		ruleId +
 		'?application=' +
-		application
+		encodeURIComponent(application) +
+		(lang && lang !== 'en' ? '&lang=' + encodeURIComponent(lang) : '')
 	);
 }
 

test/core/base/audit.js

@@ -236,6 +236,24 @@ describe('Audit', function() {
 				'https://dequeuniversity.com/rules/axe/1.0/target?application=axeAPI'
 			);
 		});
+		it('sets the lang query if locale has been set', function() {
+			var audit = new Audit();
+			audit.addRule({
+				id: 'target',
+				matches: 'function () {return "hello";}',
+				selector: 'bob'
+			});
+			audit.applyLocale({
+				lang: 'de'
+			});
+			assert.lengthOf(audit.rules, 1);
+			assert.equal(audit.data.rules.target, undefined);
+			audit._constructHelpUrls();
+			assert.deepEqual(audit.data.rules.target, {
+				helpUrl:
+					'https://dequeuniversity.com/rules/axe/x.y/target?application=axeAPI&lang=de'
+			});
+		});
 	});
 
 	describe('Audit#setBranding', function() {
@@ -368,6 +386,16 @@ describe('Audit', function() {
 			audit.resetRulesAndChecks();
 			assert.equal(audit.checks.target, undefined);
 		});
+		it('should reset locale', function() {
+			var audit = new Audit();
+			assert.equal(audit.lang, 'en');
+			audit.applyLocale({
+				lang: 'de'
+			});
+			assert.equal(audit.lang, 'de');
+			audit.resetRulesAndChecks();
+			assert.equal(audit.lang, 'en');
+		});
 	});
 
 	describe('Audit#addCheck', function() {

test/core/public/configure.js

@@ -343,6 +343,22 @@ describe('axe.configure', function() {
 			});
 		});
 
+		it('sets the lang property', function() {
+			axe.configure({
+				locale: {
+					lang: 'lol',
+					rules: { greeting: { description: 'hello' } },
+					checks: {
+						banana: {
+							fail: 'icecream'
+						}
+					}
+				}
+			});
+
+			assert.equal(axe._audit.lang, 'lol');
+		});
+
 		describe('only given checks', function() {
 			it('should not error', function() {
 				assert.doesNotThrow(function() {