core_context-8.x-1.x-dev/tests/modules/core_context_test/core_context_test.module

<?php

/**
 * @file
 * Contains hooks for testing Core Context.
 */

use Drupal\core_context\SettingsContextHandler;

/**
 * Implements hook_entity_type_alter().
 */
function core_context_test_entity_type_alter(array &$entity_types) {
  if (array_key_exists('entity_test_bundle', $entity_types)) {
    $entity_types['entity_test_bundle']->setHandlerClass('context', SettingsContextHandler::class);
  }
}