diff --git a/core/modules/file/tests/src/FunctionalJavascript/FileManagedFileElementTest.php b/core/modules/file/tests/src/FunctionalJavascript/FileManagedFileElementTest.php
index b3be5b6fe2..a1d978f90b 100644
--- a/core/modules/file/tests/src/FunctionalJavascript/FileManagedFileElementTest.php
+++ b/core/modules/file/tests/src/FunctionalJavascript/FileManagedFileElementTest.php
@@ -37,14 +37,17 @@ protected function setUp() {
    * Tests the managed_file element type.
    */
   public function testManagedFile() {
+    $assert_session = $this->assertSession();
+    $page = $this->getSession()->getPage();
     // Perform the tests with all permutations of $form['#tree'],
     // $element['#extended'], and $element['#multiple'].
     $filename = \Drupal::service('file_system')->tempnam('temporary://', "testManagedFile") . '.txt';
+    $file_path = $this->container->get('file_system')->realpath($filename);
     file_put_contents($filename, $this->randomString(128));
-    foreach (['stable', 'seven'] as $themename) {
-      \Drupal::service('theme_installer')->install([$themename]);
+    foreach (['stable', 'seven'] as $theme_name) {
+      \Drupal::service('theme_installer')->install([$theme_name]);
       $theme_config = \Drupal::configFactory()->getEditable('system.theme');
-      $theme_config->set('default', $themename)->save();
+      $theme_config->set('default', $theme_name)->save();
       foreach ([0, 1] as $tree) {
         foreach ([0, 1] as $extended) {
           foreach ([0, 1] as $multiple) {
@@ -58,29 +61,25 @@ public function testManagedFile() {
             $this->drupalGet($path);
 
             // Assert the dropzone enhancements in the seven theme.
-            if ($themename === 'seven') {
-              $trigger = $this->assertSession()->elementExists('css', '.dropzone .dropzone__trigger');
+            if ($theme_name === 'seven') {
+              $trigger = $assert_session->elementExists('css', '.dropzone .dropzone__trigger');
               $trigger->mouseOver();
               $this->assertEquals(TRUE, $trigger->hasClass('is-hovering'));
-              $this->assertSession()->elementExists('css', '.dropzone .dropzone__no-trigger .form-managed-file-wrapper--dropzone .js-dropzone-add-button');
+              $assert_session->elementExists('css', '.dropzone .dropzone__no-trigger .form-managed-file-wrapper--dropzone .js-dropzone-add-button');
             }
             else {
-              $this->assertSession()->elementNotExists('css', '.dropzone');
+              $assert_session->elementNotExists('css', '.dropzone');
             }
 
-            $this->getSession()
-              ->getPage()
-              ->attachFileToField($file_field_name, $this->container->get('file_system')
-                ->realpath($filename));
-            $uploaded_file = $this->assertSession()
-              ->waitForElement('css', '.file--mime-text-plain');
+            $page->attachFileToField($file_field_name, $file_path);
+            $uploaded_file = $assert_session->waitForElement('css', '.file--mime-text-plain');
             $this->assertNotEmpty($uploaded_file);
             $last_fid = $this->getLastFileId();
             $this->assertGreaterThan($last_fid_prior, $last_fid, 'New file got uploaded.');
-            if ($multiple && $themename === 'seven') {
-              $files_wrapper = $this->assertSession()->elementExists('css', '.form-managed-file-items');
-              $this->assertSession()->buttonExists('Remove selected', $files_wrapper);
-              $this->assertSession()->elementExists('css', '.form-type-checkbox');
+            if ($multiple && $theme_name === 'seven') {
+              $files_wrapper = $assert_session->elementExists('css', '.form-managed-file-items');
+              $assert_session->buttonExists('Remove selected', $files_wrapper);
+              $assert_session->elementExists('css', '.form-type-checkbox');
             }
             $this->drupalPostForm(NULL, [], t('Save'));
 
@@ -89,33 +88,27 @@ public function testManagedFile() {
             $this->drupalGet($path . '/' . $last_fid);
             if ($multiple) {
               $selected_checkbox = ($tree ? 'nested[file]' : 'file') . '[file_' . $last_fid . '][selected]';
-              $this->getSession()->getPage()->checkField($selected_checkbox);
+              $page->checkField($selected_checkbox);
             }
-            $this->getSession()->getPage()->pressButton($remove_button_title);
-            $this->assertSession()->assertWaitOnAjaxRequest();
+            $page->pressButton($remove_button_title);
+            $assert_session->assertWaitOnAjaxRequest();
             $this->drupalPostForm(NULL, [], t('Save'));
-            $this->assertSession()
-              ->responseContains(t('The file ids are %fids.', ['%fids' => '']));
+            $assert_session->responseContains(t('The file ids are %fids.', ['%fids' => '']));
 
             // Upload, then Remove, then Submit.
             $this->drupalGet($path);
-            $this->getSession()
-              ->getPage()
-              ->attachFileToField($file_field_name, $this->container->get('file_system')
-                ->realpath($filename));
-            $uploaded_file = $this->assertSession()
-              ->waitForElement('css', '.file--mime-text-plain');
+            $page->attachFileToField($file_field_name, $file_path);
+            $uploaded_file = $assert_session->waitForElement('css', '.file--mime-text-plain');
             $this->assertNotEmpty($uploaded_file);
             if ($multiple) {
               $selected_checkbox = ($tree ? 'nested[file]' : 'file') . '[file_' . $this->getLastFileId() . '][selected]';
-              $this->getSession()->getPage()->checkField($selected_checkbox);
+              $page->checkField($selected_checkbox);
             }
-            $this->getSession()->getPage()->pressButton($remove_button_title);
-            $this->assertSession()->assertWaitOnAjaxRequest();
+            $page->pressButton($remove_button_title);
+            $assert_session->assertWaitOnAjaxRequest();
 
             $this->drupalPostForm(NULL, [], t('Save'));
-            $this->assertSession()
-              ->responseContains(t('The file ids are %fids.', ['%fids' => '']));
+            $assert_session->responseContains(t('The file ids are %fids.', ['%fids' => '']));
           }
         }
       }