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diff --git a/web/core/modules/serialization/tests/src/Unit/Normalizer/NullNormalizerTest.php b/web/core/modules/serialization/tests/src/Unit/Normalizer/NullNormalizerTest.php
new file mode 100644
index 000000000..34a28b208
--- /dev/null
+++ b/web/core/modules/serialization/tests/src/Unit/Normalizer/NullNormalizerTest.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Drupal\Tests\serialization\Unit\Normalizer;
+
+use Drupal\serialization\Normalizer\NullNormalizer;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\serialization\Normalizer\NullNormalizer
+ * @group serialization
+ */
+class NullNormalizerTest extends UnitTestCase {
+
+  /**
+   * The NullNormalizer instance.
+   *
+   * @var \Drupal\serialization\Normalizer\NullNormalizer
+   */
+  protected $normalizer;
+
+  /**
+   * The interface to use in testing.
+   *
+   * @var string
+   */
+  protected $interface = 'Drupal\Core\TypedData\TypedDataInterface';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->normalizer = new NullNormalizer($this->interface);
+  }
+
+  /**
+   * @covers ::__construct
+   * @covers ::supportsNormalization
+   */
+  public function testSupportsNormalization() {
+    $mock = $this->getMock('Drupal\Core\TypedData\TypedDataInterface');
+    $this->assertTrue($this->normalizer->supportsNormalization($mock));
+    // Also test that an object not implementing TypedDataInterface fails.
+    $this->assertFalse($this->normalizer->supportsNormalization(new \stdClass()));
+  }
+
+  /**
+   * @covers ::normalize
+   */
+  public function testNormalize() {
+    $mock = $this->getMock('Drupal\Core\TypedData\TypedDataInterface');
+    $this->assertNull($this->normalizer->normalize($mock));
+  }
+
+}