fix: disable `void-style` when using `toHTMLValidate` matcher

docs/frameworks/jest.md

@@ -33,6 +33,12 @@ const elem = document.createElement("div");
 expect(elem).toHTMLValidate();
 ```
 
+<div class="alert alert-info">
+	<i class="fa fa-info-circle" aria-hidden="true"></i>
+	<strong>Note</strong>
+	<p>The {@link void-style} rule is disabled by default since jsdom normalizes the style. It can be enabled by passing a custom configuration reenabling it.</p>
+</div>
+
 If needed a custom configuration can be passed:
 
 ```js

src/matchers.spec.ts

@@ -246,6 +246,11 @@ describe("toHTMLValidate()", () => {
 		});
 	});
 
+	it("should ignore void-style by default", () => {
+		expect.assertions(1);
+		expect("<hr><hr/>").toHTMLValidate();
+	});
+
 	it("should support jsdom", () => {
 		/* eslint-disable-next-line @typescript-eslint/ban-ts-ignore */
 		// @ts-ignore DOM library not available

src/matchers.ts

 /* eslint-disable @typescript-eslint/no-namespace, @typescript-eslint/ban-ts-ignore, prefer-template, sonarjs/no-duplicate-string */
 
 import diff from "jest-diff";
+import deepmerge from "deepmerge";
 import { TokenType } from "./lexer";
 import { Message, Report, Result } from "./reporter";
 import { ConfigData } from "./config";
@@ -144,7 +145,7 @@ function toHTMLValidate(
 	this: jest.MatcherUtils,
 	// @ts-ignore DOM library not available
 	actual: string | HTMLElement,
-	config?: ConfigData,
+	userConfig?: ConfigData,
 	filename?: string
 ): jest.CustomMatcherResult {
 	// @ts-ignore DOM library not available
@@ -152,6 +153,15 @@ function toHTMLValidate(
 		actual = actual.outerHTML;
 	}
 
+	const defaultConfig = {
+		rules: {
+			/* jsdom normalizes style so disabling rule when using this matcher or it
+			 * gets quite noisy when configured with self-closing */
+			"void-style": "off",
+		},
+	};
+	const config = deepmerge(defaultConfig, userConfig || {});
+
 	const actualFilename = filename || this.testPath;
 	const htmlvalidate = new HtmlValidate();
 	const report = htmlvalidate.validateString(actual, actualFilename, config);