diff --git a/core/tests/Drupal/Tests/Core/Menu/MenuLinkDefaultFormTest.php b/core/tests/Drupal/Tests/Core/Menu/MenuLinkDefaultFormTest.php
new file mode 100644
index 0000000..7fe8d72
--- /dev/null
+++ b/core/tests/Drupal/Tests/Core/Menu/MenuLinkDefaultFormTest.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\Core\Menu\MenuLinkDefaultFormTest.
+ */
+
+namespace Drupal\Tests\Core\Menu;
+
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Form\FormState;
+use Drupal\Core\Menu\Form\MenuLinkDefaultForm;
+use Drupal\Core\Menu\MenuLinkDefault;
+use Drupal\Core\Menu\MenuLinkManagerInterface;
+use Drupal\Core\Menu\MenuParentFormSelectorInterface;
+use Drupal\Core\Menu\StaticMenuLinkOverridesInterface;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\Core\Menu\Form\MenuLinkDefaultForm
+ * @group Menu
+ */
+class MenuLinkDefaultFormTest extends UnitTestCase {
+
+  /**
+   * @covers ::extractFormValues
+   */
+  public function testExtractFormValues() {
+    $menu_link_manager = $this->prophesize(MenuLinkManagerInterface::class);
+    $menu_parent_form_selector = $this->prophesize(MenuParentFormSelectorInterface::class);
+    $module_handler = $this->prophesize(ModuleHandlerInterface::class);
+    $menu_link_form = new MenuLinkDefaultForm($menu_link_manager->reveal(), $menu_parent_form_selector->reveal(), $this->getStringTranslationStub(), $module_handler->reveal());
+
+    $static_override = $this->prophesize(StaticMenuLinkOverridesInterface::class);
+    $menu_link = new MenuLinkDefault([], 'my_plugin_id', [], $static_override->reveal());
+    $menu_link_form->setMenuLinkInstance($menu_link);
+
+    $form_state = new FormState();
+    $form_state->setValue('id', 'my_plugin_id');
+    $form_state->setValue('enabled', FALSE);
+    $form_state->setValue('weight', 5);
+    $form_state->setValue('expanded', TRUE);
+    $form_state->setValue('menu_parent', 'foo:bar');
+
+    $form = [];
+    $result = $menu_link_form->extractFormValues($form, $form_state);
+
+    $this->assertEquals([
+      'id' => 'my_plugin_id',
+      'enabled' => 0,
+      'weight' => 5,
+      'expanded' => 1,
+      'parent' => 'bar',
+      'menu_name' => 'foo'
+    ], $result);
+  }
+
+}