config_filter 8.x-1.7

This release has a new test trait together with 8.x-2.2
See Issue #3173393

/**
 * Trait to easily test import and export of config by comparing storages.
 *
 * The "new" config storage transformation API which was added to drupal 8.8
 * transforms the storage before importing and exporting via the event system.
 * This is a very different API from Config Filter 1.x but they work together.
 *
 * This test trait aims to provide methods to guide developers writing tests
 * that work independently of whether the module uses Config Filter plugins or
 * the new core events. You do this by comparing what you expect to be imported
 * or exported.
 *
 * Drupal core <8.8 with config filter:
 * export:
 * [active] ----------------------------------------> [filter wrapping [sync]]
 * import:
 * [filter wrapping [sync]] ----------------------------------------> [active]
 *
 * Drupal core >=8.8:
 * export:
 * [active] ---------------> [export transformation] -----------------> [sync]
 * import:
 * [sync] -----------------> [import transformation] ---------------> [active]
 *
 * The test for exporting should set up the active store by saving config and
 * what is expected to be exported and then compare the export storage with it.
 * The test for importing should set up the sync store by writing files (or by
 * saving arrays to the FileStorage) and then comparing the expectations with
 * the import storage.
 *
 * Tests using this trait will work with Config Filter 1.x and 2.x and they will
 * also work when using the core api directly provided the module has the same
 * behaviour with the event listener as with the config filter plugin.
 *
 * @see \Drupal\Tests\config_filter\Kernel\ExampleStorageKernelTest
 */
trait ConfigStorageTestTrait