core/modules/file/tests/src/Kernel/LinkTest.php | 67 +------------------------
 1 file changed, 1 insertion(+), 66 deletions(-)

diff --git a/core/modules/file/tests/src/Kernel/LinkTest.php b/core/modules/file/tests/src/Kernel/LinkTest.php
index 5e99846..ff451e1 100644
--- a/core/modules/file/tests/src/Kernel/LinkTest.php
+++ b/core/modules/file/tests/src/Kernel/LinkTest.php
@@ -4,78 +4,13 @@
 
 use Drupal\Core\Entity\Exception\UndefinedLinkTemplateException;
 use Drupal\Core\Url;
-use Drupal\file\Entity\File;
-use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests \Drupal\file\Entity\File::link().
  *
  * @group file
  */
-class LinkTest extends KernelTestBase {
-
-  /**
-   * Creates a file and returns its URI.
-   *
-   * @param string $file_path
-   *   (optional) A string specifying the file path. If it is NULL, then a
-   *   randomly named file will be created in the site's files directory.
-   * @param string $contents
-   *   (optional) The contents to save into the file. If it is NULL, then an
-   *   arbitrary string will be used.
-   * @param string $scheme
-   *   (optional) A string indicating the stream scheme to use. Drupal core
-   *   includes public, private, and temporary. The public wrapper is the
-   *   default.
-   *
-   * @return string
-   *   The file URI.
-   */
-  protected function createUri($file_path = NULL, $contents = NULL, $scheme = NULL) {
-    if (!isset($file_path)) {
-      $file_path = $this->randomMachineName();
-    }
-    if (!isset($scheme)) {
-      $scheme = file_default_scheme();
-    }
-    $file_path = $scheme . '://' . $file_path;
-
-    if (!isset($contents)) {
-      $contents = "file_put_contents() doesn't seem to appreciate empty strings so let's put in some data.";
-    }
-
-    file_put_contents($file_path, $contents);
-    $this->assertFileExists($file_path);
-
-    return $file_path;
-  }
-
-  /**
-   * Creates a file and saves it.
-   *
-   * @param string $file_path
-   *   (optional) A string specifying the file path. If it is NULL, then a
-   *   randomly named file will be created in the site's files directory.
-   * @param string $contents
-   *   (optional) The contents to save into the file. If it is NULL, then an
-   *   arbitrary string will be used.
-   * @param string $scheme
-   *   (optional) A string indicating the stream scheme to use. Drupal core
-   *   includes public, private, and temporary. The public wrapper is the
-   *   default.
-   *
-   * @return \Drupal\file\FileInterface
-   *   The file entity.
-   */
-  protected function createFile($file_path = NULL, $contents = NULL, $scheme = NULL) {
-    $file = File::create([
-      'uri' => $this->createUri($file_path, $contents, $scheme),
-      'uid' => 1,
-    ]);
-    $file->save();
-
-    return $file;
-  }
+class LinkTest extends FileManagedUnitTestBase {
 
   /**
    * Creates a link for a public file and tests the public link.