test: refactoring tests

src/index.ts

@@ -265,6 +265,7 @@ export default function html(opts: RollupHtmlOptions = {}): Plugin {
           } while (nodeQueue.length > 0);
         }
 
+        // Beware leak of AST (we're starting MagicString on a parsed and modified version of the HTML file, sourcemappings in the HTML file will be off. (can't add a sourcemap for a html file anyway, unless it is outputted as JS module)
         let htmlJS = new MagicString(serializeHtml(htmlModule.document));
         htmlJS.replaceAll(/`/g,'\\\`').replaceAll(/\$\{/g,'\\${');