Drupal 11 fixes added.

tests/src/Functional/MenuLinkFieldStandardTest.php

@@ -64,10 +64,11 @@ class MenuLinkFieldStandardTest extends BrowserTestBase {
         ],
       ],
     ]);
-    $this->drupalPostForm("node/{$node->id()}/edit", $edit, 'Save');
+    $this->drupalGet("node/{$node->id()}/edit");
+    $this->submitForm($edit, 'Save');
     $this->drupalGet("node/{$node->id()}/edit");
     $this->assertSession()->checkboxNotChecked('edit-menu-link-0-enabled');
-    $this->assertOptionSelected('edit-menu-link-0-menu-parent', 'main:');
+    $this->assertTrue($this->assertSession()->optionExists('edit-menu-link-0-menu-parent', 'main:')->hasAttribute('selected'));
     // Enable another menu.
     $edit = $this->translatePostValues([
       'settings' => [
@@ -77,9 +78,10 @@ class MenuLinkFieldStandardTest extends BrowserTestBase {
         ],
       ],
     ]);
-    $this->drupalPostForm('admin/structure/types/manage/article/fields/node.article.menu_link', $edit, 'Save settings');
+    $this->drupalGet('admin/structure/types/manage/article/fields/node.article.menu_link');
+    $this->submitForm($edit, 'Save settings');
     $this->drupalGet("node/{$node->id()}/edit");
-    $this->assertOptionSelected('edit-menu-link-0-menu-parent', 'main:');
+    $this->assertTrue($this->assertSession()->optionExists('edit-menu-link-0-menu-parent', 'main:')->hasAttribute('selected'));
     $edit = $this->translatePostValues([
       'menu_link' => [
         0 => [
@@ -87,9 +89,10 @@ class MenuLinkFieldStandardTest extends BrowserTestBase {
         ],
       ],
     ]);
-    $this->drupalPostForm("node/{$node->id()}/edit", $edit, 'Save');
     $this->drupalGet("node/{$node->id()}/edit");
-    $this->assertOptionSelected('edit-menu-link-0-menu-parent', 'footer:');
+    $this->submitForm($edit, 'Save');
+    $this->drupalGet("node/{$node->id()}/edit");
+    $this->assertTrue($this->assertSession()->optionExists('edit-menu-link-0-menu-parent', 'footer:')->hasAttribute('selected'));
   }
 
 }