feat(new-rule): check that treeitem role has an accessible name

doc/rule-descriptions.md

@@ -79,6 +79,7 @@ Rules that do not necessarily conform to WCAG success criterion but are industry
 | :----------------------------------------------------------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------------------- | :----------------- | :---------------------------------------------- | :------------------------- |
 | [accesskeys](https://dequeuniversity.com/rules/axe/4.0/accesskeys?application=RuleDescription)                                                   | Ensures every accesskey attribute value is unique                                                          | Serious            | cat.keyboard, best-practice                     | failure                    |
 | [aria-allowed-role](https://dequeuniversity.com/rules/axe/4.0/aria-allowed-role?application=RuleDescription)                                     | Ensures role attribute has an appropriate value for the element                                            | Minor              | cat.aria, best-practice                         | failure, needs review |
+| [aria-treeitem-name](https://dequeuniversity.com/rules/axe/4.0/aria-treeitem-name?application=RuleDescription)                                   | Ensures every ARIA treeitem node has an accessible name                                                    | Serious            | cat.aria, best-practice                         | failure, needs review |
 | [empty-heading](https://dequeuniversity.com/rules/axe/4.0/empty-heading?application=RuleDescription)                                             | Ensures headings have discernible text                                                                     | Minor              | cat.name-role-value, best-practice              | failure, needs review |
 | [frame-tested](https://dequeuniversity.com/rules/axe/4.0/frame-tested?application=RuleDescription)                                               | Ensures <iframe> and <frame> elements contain the axe-core script                              | Critical           | cat.structure, review-item, best-practice       | failure, needs review |
 | [frame-title-unique](https://dequeuniversity.com/rules/axe/4.0/frame-title-unique?application=RuleDescription)                                   | Ensures <iframe> and <frame> elements contain a unique title attribute                         | Serious            | cat.text-alternatives, best-practice            | failure                    |

lib/rules/aria-treeitem-name.json

@@ -0,0 +1,18 @@
+{
+	"id": "aria-treeitem-name",
+	"selector": "[role=\"treeitem\"]",
+	"matches": "no-naming-method-matches",
+	"tags": ["cat.aria", "best-practice"],
+	"metadata": {
+		"description": "Ensures every ARIA treeitem node has an accessible name",
+		"help": "ARIA treeitem nodes must have an accessible name"
+	},
+	"all": [],
+	"any": [
+		"has-visible-text",
+		"aria-labelledby",
+		"aria-label",
+		"non-empty-title"
+	],
+	"none": []
+}

test/integration/rules/aria-treeitem-name/aria-treeitem-name.html

@@ -0,0 +1,32 @@
+<!-- PASS -->
+<div role="tree">
+	<div id="pass1" role="treeitem">Item</div>
+	<div id="pass2" role="treeitem" title="Item"></div>
+	<div id="pass3" role="treeitem" aria-label="Item"></div>
+	<div id="pass4" role="treeitem" aria-labelledby="item"></div>
+</div>
+
+<div id="item">Item</div>
+
+<!-- FAIL -->
+<div role="tree">
+	<div id="fail1" role="treeitem"></div>
+	<div id="fail2" role="treeitem" aria-labelledby="item-non-existant"></div>
+	<div id="fail3" role="treeitem" aria-labelledby="item-empty"></div>
+</div>
+
+<div id="item-empty"></div>
+
+<!-- INAPPLICABLE -->
+<div role="tree">
+	<img role="treeitem" alt="Label" id="inapplicable1" />
+	<input role="treeitem" title="Label" id="inapplicable2" />
+	<button role="treeitem" title="Label" id="inapplicable3"></button>
+	<a href="#" role="treeitem" title="Label" id="inapplicable4"></a>
+	<select role="treeitem" title="Label" id="inapplicable5">
+		<option value="volvo">Volvo</option>
+		<option value="saab">Saab</option>
+		<option value="opel">Opel</option>
+	</select>
+	<textarea role="treeitem" id="inapplicable6" title="Label"></textarea>
+</div>

test/integration/rules/aria-treeitem-name/aria-treeitem-name.json

@@ -0,0 +1,6 @@
+{
+	"description": "aria-treeitem-name test",
+	"rule": "aria-treeitem-name",
+	"passes": [["#pass1"], ["#pass2"], ["#pass3"], ["#pass4"]],
+	"violations": [["#fail1"], ["#fail2"], ["#fail3"]]
+}

test/integration/virtual-rules/aria-treeitem-name.js

@@ -0,0 +1,89 @@
+describe('aria-treeitem-name', function() {
+	it('should pass for aria-label', function() {
+		var node = new axe.SerialVirtualNode({
+			nodeName: 'div',
+			attributes: {
+				role: 'treeitem',
+				'aria-label': 'foobar'
+			}
+		});
+		node.parent = null;
+
+		var results = axe.runVirtualRule('aria-treeitem-name', node);
+
+		assert.lengthOf(results.passes, 1);
+		assert.lengthOf(results.violations, 0);
+		assert.lengthOf(results.incomplete, 0);
+	});
+
+	it('should incomplete for aria-labelledby', function() {
+		var node = new axe.SerialVirtualNode({
+			nodeName: 'div',
+			attributes: {
+				role: 'treeitem',
+				'aria-labelledby': 'foobar'
+			}
+		});
+		node.parent = null;
+
+		var results = axe.runVirtualRule('aria-treeitem-name', node);
+
+		assert.lengthOf(results.passes, 0);
+		assert.lengthOf(results.violations, 0);
+		assert.lengthOf(results.incomplete, 1);
+	});
+
+	it('should pass for title', function() {
+		var node = new axe.SerialVirtualNode({
+			nodeName: 'div',
+			attributes: {
+				role: 'treeitem',
+				title: 'foobar'
+			}
+		});
+		// children are required since titleText comes after subtree text
+		// in accessible name calculation
+		node.children = [];
+		node.parent = null;
+
+		var results = axe.runVirtualRule('aria-treeitem-name', node);
+
+		assert.lengthOf(results.passes, 1);
+		assert.lengthOf(results.violations, 0);
+		assert.lengthOf(results.incomplete, 0);
+	});
+
+	it('should fail when aria-label contains only whitespace', function() {
+		var node = new axe.SerialVirtualNode({
+			nodeName: 'div',
+			attributes: {
+				role: 'treeitem',
+				'aria-label': ' \t   \n   '
+			}
+		});
+		node.children = [];
+
+		var results = axe.runVirtualRule('aria-treeitem-name', node);
+
+		assert.lengthOf(results.passes, 0);
+		assert.lengthOf(results.violations, 1);
+		assert.lengthOf(results.incomplete, 0);
+	});
+
+	it('should fail when title is empty', function() {
+		var node = new axe.SerialVirtualNode({
+			nodeName: 'div',
+			attributes: {
+				role: 'treeitem',
+				title: ''
+			}
+		});
+		node.children = [];
+
+		var results = axe.runVirtualRule('aria-treeitem-name', node);
+
+		assert.lengthOf(results.passes, 0);
+		assert.lengthOf(results.violations, 1);
+		assert.lengthOf(results.incomplete, 0);
+	});
+});

test/integration/virtual-rules/index.html

@@ -27,6 +27,7 @@
 		<script src="aria-progressbar-name.js"></script>
 		<script src="aria-toggle-field-name.js"></script>
 		<script src="aria-tooltip-name.js"></script>
+		<script src="aria-treeitem-name.js"></script>
 		<script src="autocomplete-valid.js"></script>
 		<script src="button-name.js"></script>
 		<script src="frame-title.js"></script>