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diff --git a/web/modules/contrib/embed/tests/src/Unit/DomHelperTraitTest.php b/web/modules/contrib/embed/tests/src/Unit/DomHelperTraitTest.php
new file mode 100644
index 000000000..95eda7141
--- /dev/null
+++ b/web/modules/contrib/embed/tests/src/Unit/DomHelperTraitTest.php
@@ -0,0 +1,144 @@
+<?php
+
+namespace Drupal\Tests\embed\Unit;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Component\Serialization\Json;
+use Drupal\Tests\UnitTestCase;
+use Drupal\embed\DomHelperTrait;
+
+/**
+ * Tests \Drupal\embed\DomHelperTrait.
+ *
+ * @group embed
+ */
+class DomHelperTraitTest extends UnitTestCase {
+  use DomHelperTrait;
+
+  /**
+   * The DOM Document used for testing.
+   *
+   * @var \DOMDocument
+   */
+  protected $document;
+
+  /**
+   * The DOM Node used for testing.
+   *
+   * @var \DOMElement
+   */
+  protected $node;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    $this->document = Html::load('<outer><test foo="bar" namespace:foo="bar"><test bar="foo"></test></test></outer>');
+    $this->node = $this->document->getElementsByTagName('body')->item(0)->firstChild->firstChild;
+  }
+
+  /**
+   * Tests DomHelperTrait::changeNodeName().
+   */
+  public function testChangeNodeName() {
+    $this->changeNodeName($this->node, 'tested');
+    $this->assertEquals($this->node->tagName, 'tested');
+    $this->assertEquals(Html::serialize($this->document), '<outer><tested foo="bar" namespace:foo="bar"><test bar="foo"></test></tested></outer>');
+  }
+
+  /**
+   * Tests DomHelperTrait::setNodeContent().
+   *
+   * @dataProvider providerTestSetNodeContent
+   */
+  public function testSetNodeContent($content, $expected_output) {
+    $this->setNodeContent($this->node, $content);
+    $this->assertEquals(Html::serialize($this->document), $expected_output);
+  }
+
+  /**
+   * @return array
+   * @see ::testSetNodeContent()
+   */
+  public function providerTestSetNodeContent() {
+    return [
+      'empty' => [
+        '',
+        '<outer><test foo="bar" namespace:foo="bar"></test></outer>',
+      ],
+      'single node without children' => [
+        '<div></div>',
+        '<outer><test foo="bar" namespace:foo="bar"><div></div></test></outer>',
+      ],
+      'single node with children' => [
+        '<div><replacement replaced="true" /></div>',
+        '<outer><test foo="bar" namespace:foo="bar"><div><replacement replaced="true"></replacement></div></test></outer>',
+      ],
+      'multiple nodes' => [
+        '<p>first</p><p>second</p>',
+        '<outer><test foo="bar" namespace:foo="bar"><p>first</p><p>second</p></test></outer>',
+      ],
+      'multiple nodes, with a text node, comment node and element node' => [
+        'Second <!-- comment --> <p>third</p>',
+        '<outer><test foo="bar" namespace:foo="bar">Second <!-- comment --> <p>third</p></test></outer>',
+      ],
+    ];
+  }
+
+  /**
+   * Test DomHelperTrait::replaceNodeContent().
+   *
+   * @dataProvider providerTestReplaceNodeContent
+   */
+  public function testReplaceNodeContent($content, $expected_output) {
+    $this->replaceNodeContent($this->node, $content);
+    $this->assertEquals($expected_output, Html::serialize($this->document));
+  }
+
+  /**
+   * @return array
+   * @see ::testReplaceNodeContent()
+   */
+  public function providerTestReplaceNodeContent() {
+    return [
+      'empty' => [
+        '',
+        '<outer></outer>',
+      ],
+      'single node without children' => [
+        '<div></div>',
+        '<outer><div></div></outer>',
+      ],
+      'single node with children' => [
+        '<div><replacement replaced="true" /></div>',
+        '<outer><div><replacement replaced="true"></replacement></div></outer>',
+      ],
+      'multiple nodes' => [
+        '<p>first</p><p>second</p>',
+        '<outer><p>first</p><p>second</p></outer>',
+      ],
+      'multiple nodes, with a text node, comment node and element node' => [
+        'Second <!-- comment --> <p>third</p>',
+        '<outer>Second <!-- comment --> <p>third</p></outer>',
+      ],
+    ];
+  }
+
+  /**
+   * Test DomHelperTrait::getNodeAttributesAsArray().
+   */
+  public function testGetNodeAttributesAsArray() {
+    $attributes = $this->getNodeAttributesAsArray($this->node);
+    $this->assertArrayEquals(['foo' => 'bar', 'namespace:foo' => 'bar'], $attributes);
+
+    // Test more complex attributes with special characters.
+    $string = "TEST: A <complex> 'encoded' \"JSON\" string";
+    $object = ['nested' => ['array' => TRUE], 'string' => $string];
+    $html = '<test data-json-string=\'' . Json::encode($string) . '\' data-json-object=\'' . Json::encode($object) . '\'></test>';
+    $document = Html::load($html);
+    $node = $document->getElementsByTagName('body')->item(0)->firstChild;
+    $attributes = $this->getNodeAttributesAsArray($node);
+    $this->assertArrayEquals(['data-json-string' => $string, 'data-json-object' => $object], $attributes);
+  }
+
+}