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diff --git a/web/core/modules/taxonomy/tests/src/Functional/TermEntityReferenceTest.php b/web/core/modules/taxonomy/tests/src/Functional/TermEntityReferenceTest.php
new file mode 100644
index 000000000..9d4522ec7
--- /dev/null
+++ b/web/core/modules/taxonomy/tests/src/Functional/TermEntityReferenceTest.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace Drupal\Tests\taxonomy\Functional;
+
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\field\Entity\FieldConfig;
+
+/**
+ * Tests the settings of restricting term selection to a single vocabulary.
+ *
+ * @group taxonomy
+ */
+class TermEntityReferenceTest extends TaxonomyTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['entity_reference_test', 'entity_test'];
+
+  /**
+   * Tests an entity reference field restricted to a single vocabulary.
+   *
+   * Creates two vocabularies with a term, then set up the entity reference
+   * field to limit the target vocabulary to one of them, ensuring that
+   * the restriction applies.
+   */
+  public function testSelectionTestVocabularyRestriction() {
+
+    // Create two vocabularies.
+    $vocabulary = $this->createVocabulary();
+    $vocabulary2 = $this->createVocabulary();
+
+    $term = $this->createTerm($vocabulary);
+    $term2 = $this->createTerm($vocabulary2);
+
+    // Create an entity reference field.
+    $field_name = 'taxonomy_' . $vocabulary->id();
+    $field_storage = FieldStorageConfig::create([
+      'field_name' => $field_name,
+      'entity_type' => 'entity_test',
+      'translatable' => FALSE,
+      'settings' => [
+        'target_type' => 'taxonomy_term',
+      ],
+      'type' => 'entity_reference',
+      'cardinality' => 1,
+    ]);
+    $field_storage->save();
+    $field = FieldConfig::create([
+      'field_storage' => $field_storage,
+      'entity_type' => 'entity_test',
+      'bundle' => 'test_bundle',
+      'settings' => [
+        'handler' => 'default',
+        'handler_settings' => [
+          // Restrict selection of terms to a single vocabulary.
+          'target_bundles' => [
+            $vocabulary->id() => $vocabulary->id(),
+          ],
+        ],
+      ],
+    ]);
+    $field->save();
+
+    $handler = $this->container->get('plugin.manager.entity_reference_selection')->getSelectionHandler($field);
+    $result = $handler->getReferenceableEntities();
+
+    $expected_result = [
+      $vocabulary->id() => [
+        $term->id() => $term->getName(),
+      ],
+    ];
+
+    $this->assertIdentical($result, $expected_result, 'Terms selection restricted to a single vocabulary.');
+  }
+
+}