diff --git a/core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php b/core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php
index 11a5493..12e8536 100644
--- a/core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php
+++ b/core/lib/Drupal/Core/StringTranslation/TranslatableMarkup.php
@@ -9,6 +9,7 @@
 
 use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Component\Utility\ToStringTrait;
+use Drupal\Component\Utility\Unicode;
 
 /**
  * Provides translatable markup class.
diff --git a/core/tests/Drupal/KernelTests/Core/Theme/TwigMarkupInterfaceTest.php b/core/tests/Drupal/KernelTests/Core/Theme/TwigMarkupInterfaceTest.php
new file mode 100644
index 0000000..c8b5d3c
--- /dev/null
+++ b/core/tests/Drupal/KernelTests/Core/Theme/TwigMarkupInterfaceTest.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\KernelTests\Core\Theme\ThemeRenderAndAutoescapeTest.
+ */
+
+namespace Drupal\KernelTests\Core\Theme;
+
+use Drupal\Component\Render\FormattableMarkup;
+use Drupal\Core\Render\RenderContext;
+use Drupal\Core\Render\Markup;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\Core\Template\Attribute;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests.
+ *
+ * @group Theme
+ */
+class TwigMarkupInterfaceTest extends KernelTestBase {
+
+  /**
+   * @dataProvider providerTestMarkupInterfaceEmpty
+   */
+  public function testMarkupInterfaceEmpty($expected, $variable) {
+    //var_dump($variable);
+    /** @var \Drupal\Core\Render\RendererInterface $renderer */
+    $renderer = \Drupal::service('renderer');
+    $context = new RenderContext();
+    $output = $renderer->executeInRenderContext($context, function () use ($renderer, $variable) {
+      $elements = [
+        '#type' => 'inline_template',
+        '#template' => '{%- if variable is not empty -%}<span>{{ variable }}</span>{%- endif -%}',
+        '#context' => array('variable' => $variable),
+      ];
+      return $renderer->render($elements);
+    });
+    $this->assertEquals($expected, $output);
+  }
+
+  /**
+   * Provide test examples.
+   */
+  public function providerTestMarkupInterfaceEmpty() {
+    return [
+      'empty TranslatableMarkup' => ['', new TranslatableMarkup('')],
+      'non-empty TranslatableMarkup' => ['<span>test</span>', new TranslatableMarkup('test')],
+      'empty FormattableMarkup' => ['', new FormattableMarkup('', ['@foo' => 'bar'])],
+      'non-empty FormattableMarkup' => ['<span>bar</span>', new FormattableMarkup('@foo', ['@foo' => 'bar'])],
+      'non-empty Markup' => ['<span>test</span>', Markup::create('test')],
+      'empty Attribute' => ['', new Attribute()],
+      'non-empty Attribute' => ['<span> id="test"</span>', new Attribute(['id' => 'test'])],
+    ];
+  }
+
+}