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+/*!
+ * A QUnit assertion to compare DOM node trees.
+ *
+ * Adapted from VisualEditor plugin for QUnit. Additionally supports comparing properties to
+ * attributes (for dynamically generated nodes) and order-insensitive comparison of classes on DOM
+ * nodes.
+ *
+ * @copyright 2011-2015 VisualEditor Team and others; see http://ve.mit-license.org
+ * @copyright 2011-2015 OOjs Team and other contributors
+ */
+
+( function ( QUnit ) {
+
+	/**
+	 * Build a summary of an HTML element.
+	 *
+	 * Summaries include node name, text, attributes and recursive summaries of children.
+	 * Used for serializing or comparing HTML elements.
+	 *
+	 * @private
+	 * @param {HTMLElement} element Element to summarize
+	 * @param {boolean} [includeHtml=false] Include an HTML summary for element nodes
+	 * @return {Object} Summary of element.
+	 */
+	function getDomElementSummary( element, includeHtml ) {
+		var i, name,
+			summary = {
+				type: element.nodeName.toLowerCase(),
+				// $( '<div><textarea>Foo</textarea></div>' )[0].textContent === 'Foo', which breaks
+				// comparisons :( childNodes are summarized anyway, this would just be a nicety
+				// text: element.textContent,
+				attributes: {},
+				children: []
+			};
+
+		if ( includeHtml && element.nodeType === Node.ELEMENT_NODE ) {
+			summary.html = element.outerHTML;
+		}
+
+		// Gather attributes
+		if ( element.attributes ) {
+			for ( i = 0; i < element.attributes.length; i++ ) {
+				name = element.attributes[ i ].name;
+				if ( name.substr( 0, 5 ) !== 'data-' && name !== 'id' ) {
+					summary.attributes[ name ] = element.attributes[ i ].value;
+				}
+			}
+		}
+
+		// Sort classes
+		if ( summary.attributes.class ) {
+			summary.attributes.class = summary.attributes.class.split( ' ' ).sort().join( ' ' );
+		}
+
+		// Gather certain properties and pretend they are attributes.
+		// Take note of casing differences.
+		if ( element.value !== undefined ) {
+			summary.attributes.value = element.value;
+		}
+		if ( element.readOnly !== undefined ) {
+			summary.attributes.readonly = element.readOnly;
+		}
+		if ( element.checked !== undefined ) {
+			summary.attributes.checked = element.checked;
+		}
+		if ( element.disabled !== undefined ) {
+			summary.attributes.disabled = element.disabled;
+		}
+		if ( element.tabIndex !== undefined ) {
+			summary.attributes.tabindex = element.tabIndex;
+		}
+
+		// Summarize children
+		if ( element.childNodes ) {
+			for ( i = 0; i < element.childNodes.length; i++ ) {
+				summary.children.push( getDomElementSummary( element.childNodes[ i ], includeHtml ) );
+			}
+		}
+
+		// Special handling for textareas, where we only want to account for the content as the 'value'
+		// property, never as childNodes or textContent
+		if ( summary.type === 'textarea' ) {
+			// summary.text = '';
+			summary.children = [];
+		}
+
+		return summary;
+	}
+
+	/**
+	 * @method
+	 * @static
+	 */
+	QUnit.assert.equalDomElement = function ( actual, expected, message, stringify ) {
+		var actualSummary = getDomElementSummary( actual ),
+			expectedSummary = getDomElementSummary( expected ),
+			actualSummaryHtml = getDomElementSummary( actual, true ),
+			expectedSummaryHtml = getDomElementSummary( expected, true );
+
+		// When running with Karma, the objects are not nicely stringified in the output when the test
+		// fails, only showing "Expected: [object Object], Actual: [object Object]" instead. Running
+		// QUnit in browser does this, and stringifying causes double escaping in output.
+		if ( stringify ) {
+			actualSummaryHtml = JSON.stringify( actualSummaryHtml, null, 2 );
+			expectedSummaryHtml = JSON.stringify( expectedSummaryHtml, null, 2 );
+		}
+
+		QUnit.push(
+			QUnit.equiv( actualSummary, expectedSummary ), actualSummaryHtml, expectedSummaryHtml, message
+		);
+	};
+
+}( QUnit ) );