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diff --git a/web/core/modules/serialization/tests/src/Unit/Encoder/XmlEncoderTest.php b/web/core/modules/serialization/tests/src/Unit/Encoder/XmlEncoderTest.php
new file mode 100644
index 000000000..a347982b3
--- /dev/null
+++ b/web/core/modules/serialization/tests/src/Unit/Encoder/XmlEncoderTest.php
@@ -0,0 +1,104 @@
+<?php
+
+namespace Drupal\Tests\serialization\Unit\Encoder;
+
+use Drupal\serialization\Encoder\XmlEncoder;
+use Symfony\Component\Serializer\Encoder\XmlEncoder as BaseXmlEncoder;
+use Symfony\Component\Serializer\Normalizer\GetSetMethodNormalizer;
+use Symfony\Component\Serializer\Serializer;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\serialization\Encoder\XmlEncoder
+ * @group serialization
+ */
+class XmlEncoderTest extends UnitTestCase {
+
+  /**
+   * The XmlEncoder instance.
+   *
+   * @var \Drupal\serialization\Encoder\XmlEncoder
+   */
+  protected $encoder;
+
+  /**
+   * @var \Symfony\Component\Serializer\Encoder\XmlEncoder|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $baseEncoder;
+
+  /**
+   * An array of test data.
+   *
+   * @var array
+   */
+  protected $testArray = ['test' => 'test'];
+
+  protected function setUp() {
+    $this->baseEncoder = $this->getMock(BaseXmlEncoder::class);
+    $this->encoder = new XmlEncoder();
+    $this->encoder->setBaseEncoder($this->baseEncoder);
+  }
+
+  /**
+   * Tests the supportsEncoding() method.
+   */
+  public function testSupportsEncoding() {
+    $this->assertTrue($this->encoder->supportsEncoding('xml'));
+    $this->assertFalse($this->encoder->supportsEncoding('json'));
+  }
+
+  /**
+   * Tests the supportsDecoding() method.
+   */
+  public function testSupportsDecoding() {
+    $this->assertTrue($this->encoder->supportsDecoding('xml'));
+    $this->assertFalse($this->encoder->supportsDecoding('json'));
+  }
+
+  /**
+   * Tests the encode() method.
+   */
+  public function testEncode() {
+    $this->baseEncoder->expects($this->once())
+      ->method('encode')
+      ->with($this->testArray, 'test', [])
+      ->will($this->returnValue('test'));
+
+    $this->assertEquals('test', $this->encoder->encode($this->testArray, 'test'));
+  }
+
+  /**
+   * Tests the decode() method.
+   */
+  public function testDecode() {
+    $this->baseEncoder->expects($this->once())
+      ->method('decode')
+      ->with('test', 'test', [])
+      ->will($this->returnValue($this->testArray));
+
+    $this->assertEquals($this->testArray, $this->encoder->decode('test', 'test'));
+  }
+
+  /**
+   * @covers ::getBaseEncoder
+   */
+  public function testDefaultEncoderHasSerializer() {
+    // The serializer should be set on the Drupal encoder, which should then
+    // set it on our default encoder.
+    $encoder = new XmlEncoder();
+    $serialzer = new Serializer([new GetSetMethodNormalizer()]);
+    $encoder->setSerializer($serialzer);
+    $base_encoder = $encoder->getBaseEncoder();
+    $this->assertInstanceOf(BaseXmlEncoder::class, $base_encoder);
+    // Test the encoder.
+    $base_encoder->encode(['a' => new TestObject()], 'xml');
+  }
+
+}
+
+class TestObject {
+  public function getA() {
+    return 'A';
+  }
+
+}