diff --git a/core/modules/system/src/Tests/Theme/EngineTwigTest.php b/core/modules/system/src/Tests/Theme/EngineTwigTest.php
index 51d092d..58661d1 100644
--- a/core/modules/system/src/Tests/Theme/EngineTwigTest.php
+++ b/core/modules/system/src/Tests/Theme/EngineTwigTest.php
@@ -86,6 +86,7 @@ public function testTwigLinkGenerator() {
       'link via the linkgenerator: ' . $link_generator->generate('register', new Url('user.register', [], ['attributes' => ['class' => ['llama', 'kitten', 'panda']]])),
       'link via the linkgenerator: ' . $link_generator->generate(Markup::create('<span>register</span>'), new Url('user.register', [], ['absolute' => TRUE])),
       'link via the linkgenerator: <a href="' . $generated_url . '"><span>register</span><svg></svg></a>',
+      'link via the linkgenerator: ' . $link_generator->generate('register', new Url('user.register', [], ['attributes' => ['foo' => 'bar']])) . ' ' . $link_generator->generate('register', new Url('user.register', [], ['attributes' => ['foo' => 'bar']])),
     ];
 
     // Verify that link() has the ability to bubble cacheability metadata:
diff --git a/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.link_generator.html.twig b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.link_generator.html.twig
index a836aec..1b20b46 100644
--- a/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.link_generator.html.twig
+++ b/core/modules/system/tests/modules/twig_theme_test/templates/twig_theme_test.link_generator.html.twig
@@ -7,3 +7,4 @@
 <div>link via the linkgenerator: {{ link(title, test_url) }}</div>
 {% set title %}<span>register</span><svg></svg>{% endset %}
 <div>link via the linkgenerator: {{ link(title, test_url) }}</div>
+<div>link via the linkgenerator: {{ link('register', test_url_attribute) }} {{ link('register', test_url_attribute) }}</div>