--- /dev/null
+<?php
+
+/**
+ * @file
+ * Test fixture.
+ */
+
+use Drupal\Core\Database\Database;
+
+$connection = Database::getConnection();
+
+// Update core.extension.
+$extensions = $connection->select('config')
+ ->fields('config', ['data'])
+ ->condition('collection', '')
+ ->condition('name', 'core.extension')
+ ->execute()
+ ->fetchField();
+$extensions = unserialize($extensions);
+$extensions['module']['layout_builder'] = 0;
+$extensions['module']['layout_discovery'] = 0;
+$extensions['module']['layout_test'] = 0;
+$connection->update('config')
+ ->fields([
+ 'data' => serialize($extensions),
+ 'collection' => '',
+ 'name' => 'core.extension',
+ ])
+ ->condition('collection', '')
+ ->condition('name', 'core.extension')
+ ->execute();
+
+// Add a layout plugin with a dependency to an existing entity view display.
+$display = $connection->select('config')
+ ->fields('config', ['data'])
+ ->condition('collection', '')
+ ->condition('name', 'core.entity_view_display.node.article.teaser')
+ ->execute()
+ ->fetchField();
+$display = unserialize($display);
+$display['third_party_settings']['layout_builder']['sections'][] = [
+ 'layout_id' => 'layout_test_dependencies_plugin',
+ 'layout_settings' => [],
+ 'components' => [],
+];
+$connection->update('config')
+ ->fields([
+ 'data' => serialize($display),
+ 'collection' => '',
+ 'name' => 'core.entity_view_display.node.article.teaser',
+ ])
+ ->condition('collection', '')
+ ->condition('name', 'core.entity_view_display.node.article.teaser')
+ ->execute();