diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceInlineSettingsFormatter.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceInlineSettingsFormatter.php
index af08d03..6fbf111 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceInlineSettingsFormatter.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/EntityReferenceInlineSettingsFormatter.php
@@ -193,7 +193,9 @@ protected function getAvailableFormatterOptions(FieldStorageDefinitionInterface
     $options = [];
     foreach ($formatters as $formatter_id => $formatter_options) {
       $formatter_definition = $this->formatterPluginManager->getDefinition($formatter_id);
-      if (method_exists($formatter_definition['class'], 'isApplicable') && $formatter_definition['class']::isApplicable($field_definition)) {
+      /** @var \Drupal\Core\Field\FormatterInterface $formatter_class */
+      $formatter_class = $formatter_definition['class'];
+      if ($formatter_class::isApplicable($field_definition)) {
         $options[$formatter_id] = $formatter_definition['label'];
       }
     }
diff --git a/core/modules/field/src/Tests/EntityReference/EntityReferenceTestTrait.php b/core/modules/field/src/Tests/EntityReference/EntityReferenceTestTrait.php
index 568cd4d..80d38bc 100644
--- a/core/modules/field/src/Tests/EntityReference/EntityReferenceTestTrait.php
+++ b/core/modules/field/src/Tests/EntityReference/EntityReferenceTestTrait.php
@@ -11,15 +11,15 @@
 trait EntityReferenceTestTrait {
 
   /**
-   * Creates a field of an entity reference field storage on the specified bundle.
+   * Creates a field of an entity reference field storage on a given bundle.
    *
    * @param string $entity_type
    *   The type of entity the field will be attached to.
    * @param string $bundle
    *   The bundle name of the entity the field will be attached to.
    * @param string $field_name
-   *   The name of the field; if it already exists, a new instance of the existing
-   *   field will be created.
+   *   The name of the field; if it already exists, a new instance of the
+   *   existing field will be created.
    * @param string $field_label
    *   The label of the field.
    * @param string $target_entity_type
diff --git a/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceFormatterTest.php b/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceFormatterTest.php
index 1938781..7167efb 100644
--- a/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceFormatterTest.php
+++ b/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceFormatterTest.php
@@ -443,7 +443,6 @@ public function testRenderInlineSettingsFormatter($label_option, $expected_outpu
         'type' => 'string',
         'settings' => [],
         'label' => $label_option,
-        'show_basefields' => FALSE,
       ],
     ])->save();
 
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceInlineSettingsFormatterTest.php b/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceInlineSettingsFormatterTest.php
new file mode 100644
index 0000000..9571a78
--- /dev/null
+++ b/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceInlineSettingsFormatterTest.php
@@ -0,0 +1,89 @@
+<?php
+
+namespace Drupal\FunctionalJavascriptTests\EntityReference;
+
+use Drupal\Core\Entity\Entity\EntityViewDisplay;
+use Drupal\field\Tests\EntityReference\EntityReferenceTestTrait;
+use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
+use Drupal\simpletest\ContentTypeCreationTrait;
+use Drupal\simpletest\NodeCreationTrait;
+
+/**
+ * Tests the output of entity reference autocomplete widgets.
+ *
+ * @group entity_reference
+ */
+class EntityReferenceInlineSettingsFormatterTest extends JavascriptTestBase {
+
+  use ContentTypeCreationTrait;
+  use EntityReferenceTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['node', 'field_ui'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->createContentType(['type' => 'page']);
+
+    $field_name = 'field_test';
+    $this->createEntityReferenceField('node', 'page', $field_name, 'Field Test', 'node', 'default', ['target_bundles' => ['page']]);
+    EntityViewDisplay::load('node.page.default')
+      ->setComponent($field_name, [
+        'type' => 'entity_reference_label',
+      ])->save();
+
+    $user = $this->drupalCreateUser([
+      'access content',
+      'create page content',
+      'administer node display',
+    ]);
+    $this->drupalLogin($user);
+  }
+
+  /**
+   * Tests the Inline Settings Formatter configuration.
+   */
+  public function testEntityReferenceInlineSettingsFormatter() {
+    $page = $this->getSession()->getPage();
+    $assert_session = $this->assertSession();
+
+    // Visit the display config page.
+    $this->drupalGet('/admin/structure/types/manage/page/display');
+    $page->selectFieldOption('fields[field_test][type]', 'entity_reference_inline_settings');
+    $result = $assert_session->waitForElementVisible('css', '.field-plugin-summary-cell .ajax-new-content');
+    $this->assertNotEmpty($result);
+    $assert_session->pageTextContains('The field "Title" will be used by default.');
+    $assert_session->pageTextContains('The "Plain text" formatter will be used by default.');
+
+    // Open the formatter settings form by clicking the cog wheel.
+    $page->find('css', 'input[data-drupal-selector="edit-fields-field-test-settings-edit"]')->click();
+    $assert_session->assertWaitOnAjaxRequest();
+
+    $assert_session->selectExists('fields[field_test][settings_edit_form][settings][field_name]');
+    $assert_session->selectExists('fields[field_test][settings_edit_form][settings][label]');
+    $assert_session->selectExists('fields[field_test][settings_edit_form][settings][type]');
+    $assert_session->optionNotExists('fields[field_test][settings_edit_form][settings][type]', 'entity_reference_entity_id');
+    $assert_session->checkboxNotChecked('fields[field_test][settings_edit_form][settings][settings][link_to_entity]');
+    $page->selectFieldOption('fields[field_test][settings_edit_form][settings][field_name]', 'field_test');
+    $assert_session->assertWaitOnAjaxRequest();
+
+    $assert_session->selectExists('fields[field_test][settings_edit_form][settings][type]');
+    $assert_session->optionExists('fields[field_test][settings_edit_form][settings][type]', 'entity_reference_entity_id');
+    $page->selectFieldOption('fields[field_test][settings_edit_form][settings][type]', 'entity_reference_entity_id');
+    $assert_session->assertWaitOnAjaxRequest();
+
+    $page->pressButton('Update');
+    $assert_session->assertWaitOnAjaxRequest();
+
+    $assert_session->pageTextContains('Field "Field Test" displayed.');
+    $assert_session->pageTextContains('Formatter "Entity ID" used.');
+
+  }
+
+}