Reset to orignal state and just use trim() instead of rtrim

tests/src/Kernel/EntityViewBuilderTest.php

@@ -92,7 +92,7 @@ final class EntityViewBuilderTest extends AbstractTestCase {
       </article>
     HTML;
     $actual_html = $this->renderPlain($build);
-    self::assertSame(trim((string)$expected_html), trim((string)$actual_html));
+    self::assertSame(self::normalizeHtml($expected_html), self::normalizeHtml($actual_html));
 
     // -- Teaser mode.
     $build = $view_builder->build($public_node, 'teaser');
@@ -196,7 +196,7 @@ final class EntityViewBuilderTest extends AbstractTestCase {
    * Normalizes the provided HTML.
    */
   private static function normalizeHtml(string $html): string {
-    return rtrim(preg_replace(['#\s{2,}#', '#\n#'], '', $html));
+    return trim(preg_replace(['#\s{2,}#', '#\n#'], '', $html));
   }
 
 }