diff -u b/core/modules/media/tests/src/FunctionalJavascript/MediaHandlerTestBase.php b/core/modules/media/tests/src/FunctionalJavascript/MediaHandlerTestBase.php
--- b/core/modules/media/tests/src/FunctionalJavascript/MediaHandlerTestBase.php
+++ b/core/modules/media/tests/src/FunctionalJavascript/MediaHandlerTestBase.php
@@ -102,7 +102,7 @@
     // Make sure the provided fields are visible on the form.
     if (!empty($provided_fields)) {
       foreach ($provided_fields as $provided_field) {
-        $assert_session->selectExists("field_mapping[$provided_field]");
+        $assert_session->selectExists("field_map[$provided_field]");
       }
     }
 
@@ -122,25 +122,2 @@
 
-  /**
-   * Helper to assert presence/absence of select options.
-   *
-   * @param string $select
-   *   One of id|name|label|value for the select field.
-   * @param array $expected_options
-   *   An indexed array of expected option names.
-   * @param array $non_expected_options
-   *   An indexed array of non-expected option names.
-   *
-   * @see \Drupal\Tests\WebAssert::optionExists()
-   * @see \Drupal\Tests\WebAssert::optionNotExists()
-   */
-  protected function assertSelectOptions($select, $expected_options = [], $non_expected_options = []) {
-    $assert_session = $this->assertSession();
-    foreach ($expected_options as $expected_option) {
-      $assert_session->optionExists($select, $expected_option);
-    }
-    foreach ($non_expected_options as $non_expected_option) {
-      $assert_session->optionNotExists($select, $non_expected_option);
-    }
-  }
-
 }