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diff --git a/web/core/modules/file/tests/src/Kernel/ComputedFileUrlTest.php b/web/core/modules/file/tests/src/Kernel/ComputedFileUrlTest.php
new file mode 100644
index 000000000..d0f1e616e
--- /dev/null
+++ b/web/core/modules/file/tests/src/Kernel/ComputedFileUrlTest.php
@@ -0,0 +1,91 @@
+<?php
+
+namespace Drupal\Tests\file\Kernel;
+
+use Drupal\Core\Field\FieldItemInterface;
+use Drupal\Core\TypedData\DataDefinitionInterface;
+use Drupal\file\FileInterface;
+use Drupal\file\ComputedFileUrl;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * @coversDefaultClass \Drupal\file\ComputedFileUrl
+ *
+ * @group file
+ */
+class ComputedFileUrlTest extends KernelTestBase {
+
+  /**
+   * The test URL to use.
+   *
+   * @var string
+   */
+  protected $testUrl = 'public://druplicon.txt';
+
+  /**
+   * @covers ::getValue
+   */
+  public function testGetValue() {
+    $entity = $this->prophesize(FileInterface::class);
+    $entity->getFileUri()
+      ->willReturn($this->testUrl);
+
+    $parent = $this->prophesize(FieldItemInterface::class);
+    $parent->getEntity()
+      ->shouldBeCalledTimes(2)
+      ->willReturn($entity->reveal());
+
+    $definition = $this->prophesize(DataDefinitionInterface::class);
+
+    $typed_data = new ComputedFileUrl($definition->reveal(), $this->randomMachineName(), $parent->reveal());
+
+    $expected = base_path() . $this->siteDirectory . '/files/druplicon.txt';
+
+    $this->assertSame($expected, $typed_data->getValue());
+    // Do this a second time to confirm the same value is returned but the value
+    // isn't retrieved from the parent entity again.
+    $this->assertSame($expected, $typed_data->getValue());
+  }
+
+  /**
+   * @covers ::setValue
+   */
+  public function testSetValue() {
+    $name = $this->randomMachineName();
+    $parent = $this->prophesize(FieldItemInterface::class);
+    $parent->onChange($name)
+      ->shouldBeCalled();
+
+    $definition = $this->prophesize(DataDefinitionInterface::class);
+    $typed_data = new ComputedFileUrl($definition->reveal(), $name, $parent->reveal());
+
+    // Setting the value explicitly should mean the parent entity is never
+    // called into.
+    $typed_data->setValue($this->testUrl);
+
+    $this->assertSame($this->testUrl, $typed_data->getValue());
+    // Do this a second time to confirm the same value is returned but the value
+    // isn't retrieved from the parent entity again.
+    $this->assertSame($this->testUrl, $typed_data->getValue());
+  }
+
+  /**
+   * @covers ::setValue
+   */
+  public function testSetValueNoNotify() {
+    $name = $this->randomMachineName();
+    $parent = $this->prophesize(FieldItemInterface::class);
+    $parent->onChange($name)
+      ->shouldNotBeCalled();
+
+    $definition = $this->prophesize(DataDefinitionInterface::class);
+    $typed_data = new ComputedFileUrl($definition->reveal(), $name, $parent->reveal());
+
+    // Setting the value should explicitly should mean the parent entity is
+    // never called into.
+    $typed_data->setValue($this->testUrl, FALSE);
+
+    $this->assertSame($this->testUrl, $typed_data->getValue());
+  }
+
+}