diff -u b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php
--- b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php
+++ b/core/modules/image/tests/src/Functional/ImageAdminStylesTest.php
@@ -316,7 +316,7 @@
    */
   public function testStyleReplacement() {
     // Create a new style.
-    list($style, $style_name) = $this->createRandomStyle();
+    $style = $this->createRandomStyle();
     $style_path = 'admin/config/media/image-styles/manage/';
 
     // Create an image field that uses the new style.
@@ -326,7 +326,7 @@
       ->getViewDisplay('node', 'article')
       ->setComponent($field_name, [
         'type' => 'image',
-        'settings' => ['image_style' => $style_name],
+        'settings' => ['image_style' => $style->getName()],
       ])
       ->save();
 
@@ -353,7 +353,7 @@
       'name' => $new_style_name,
       'label' => $new_style_label,
     ];
-    $this->drupalGet($style_path . $style_name);
+    $this->drupalGet($style_path . $style->getName());
     $this->submitForm($edit, 'Save');
     $this->assertSession()->pageTextContains('Changes to the style have been saved.');
     $this->drupalGet('node/' . $nid);
@@ -436,7 +436,7 @@
     $admin_path = 'admin/config/media/image-styles';
 
     // Create a new style.
-    list($style, , $style_path) = $this->createRandomStyle();
+    $style = $this->createRandomStyle();
 
     // Create an image to make sure it gets flushed.
     $files = $this->drupalGetTestFiles('image');
@@ -448,7 +448,7 @@
     // Go to image styles list page and check if the flush operation link
     // exists.
     $this->drupalGet($admin_path);
-    $flush_path = $style_path . '/flush';
+    $flush_path = $style->toUrl()->toString() . '/flush';
     $this->assertSession()->linkByHrefExists($flush_path);
 
     // Flush the image style derivatives using the user interface.
@@ -464,7 +464,7 @@
    */
   public function testConfigImport() {
     // Create a new style.
-    list($style, $style_name) = $this->createRandomStyle();
+    $style = $this->createRandomStyle();
 
     // Create an image field that uses the new style.
     $field_name = strtolower($this->randomMachineName(10));
@@ -473,7 +473,7 @@
       ->getViewDisplay('node', 'article')
       ->setComponent($field_name, [
         'type' => 'image',
-        'settings' => ['image_style' => $style_name],
+        'settings' => ['image_style' => $style->getName()],
       ])
       ->save();
 
@@ -499,10 +499,10 @@
       ->removeComponent($field_name)
       ->save();
     $this->copyConfig($active, $sync);
-    $sync->delete('image.style.' . $style_name);
+    $sync->delete('image.style.' . $style->getName());
     $this->configImporter()->import();
 
-    $this->assertNull(ImageStyle::load($style_name), 'Style deleted after config import.');
+    $this->assertNull(ImageStyle::load($style->getName()), 'Style deleted after config import.');
     $this->assertEquals(0, $this->getImageCount($style), 'Image style was flushed after being deleted by config import.');
   }
 
diff -u b/core/modules/image/tests/src/Functional/ImageAdminUiTest.php b/core/modules/image/tests/src/Functional/ImageAdminUiTest.php
--- b/core/modules/image/tests/src/Functional/ImageAdminUiTest.php
+++ b/core/modules/image/tests/src/Functional/ImageAdminUiTest.php
@@ -27,15 +27,15 @@
    * Test if the help text is available on the edit effect form.
    */
   public function testAddEffectHelpText(): void {
-    list(, , $style_path) = $this->createRandomStyle();
+    $style = $this->createRandomStyle();
 
     // Add the help block to the page.
     $this->drupalPlaceBlock('help_block', ['region' => 'help', 'id' => 'block-help']);
 
     // Open the add effect form and check for the help text.
-    $this->drupalGet($style_path . '/add/image_resize');
+    $this->drupalGet($style->toUrl()->toString() . '/add/image_resize');
 
-    $this->assertSession()->pageTextContains(t('Resizing will make images an exact set of dimensions. This may cause images to be stretched or shrunk disproportionately.'));
+    $this->assertSession()->pageTextContains('Resizing will make images an exact set of dimensions. This may cause images to be stretched or shrunk disproportionately.');
   }
 
   /**
@@ -43,7 +43,7 @@
    */
   public function testEditEffectHelpText(): void {
     // Create a random image style.
-    list(, $style_name, $style_path) = $this->createRandomStyle();
+    $style = $this->createRandomStyle();
 
     // Add the help block to the page.
     $this->drupalPlaceBlock('help_block', ['region' => 'help', 'id' => 'block-help']);
@@ -52,16 +52,16 @@
     $edit = [];
     $edit['data[width]'] = 20;
     $edit['data[height]'] = 20;
-    $this->drupalGet($style_path . '/add/image_resize');
+    $this->drupalGet($style->toUrl()->toString() . '/add/image_resize');
     $this->submitForm($edit, t('Add effect'));
 
     // Open the edit effect form and check image style effect help text.
-    $style = ImageStyle::load($style_name);
+    $style = ImageStyle::load($style->getName());
     $effects = $style->get('effects');
     foreach ($effects as $ieid => $effect) {
-      $this->drupalGet($style_path . '/effects/' . $ieid);
+      $this->drupalGet($style->toUrl()->toString() . '/effects/' . $ieid);
 
-      $this->assertSession()->pageTextContains(t('Resizing will make images an exact set of dimensions. This may cause images to be stretched or shrunk disproportionately.'));
+      $this->assertSession()->pageTextContains('Resizing will make images an exact set of dimensions. This may cause images to be stretched or shrunk disproportionately.');
     }
   }
 
diff -u b/core/modules/image/tests/src/Functional/ImageFieldTestBase.php b/core/modules/image/tests/src/Functional/ImageFieldTestBase.php
--- b/core/modules/image/tests/src/Functional/ImageFieldTestBase.php
+++ b/core/modules/image/tests/src/Functional/ImageFieldTestBase.php
@@ -92,20 +92,16 @@
   /**
    * Create a random style.
    *
-   * @return array
+   * @return object
    *   A list containing the details of the generated image style.
    */
-  public function createRandomStyle(): array {
+  public function createRandomStyle(): object {
     $style_name = strtolower($this->randomMachineName());
     $style_label = $this->randomString();
     $values = ['name' => $style_name, 'label' => $style_label];
     $style = \Drupal::entityTypeManager()->getStorage('image_style')->create($values);
     $style->save();
-    return [
-      $style,
-      $style_name,
-      'admin/config/media/image-styles/manage/' . $style_name,
-    ];
+    return $style;
   }
 
   /**