9 files declare their use of ConfigTest

ConfigEntityListTest.php in core/modules/config/tests/src/Functional/ConfigEntityListTest.php
ConfigInstallWebTest.php in core/modules/config/tests/src/Functional/ConfigInstallWebTest.php
ConfigTestController.php in core/modules/config/tests/config_test/src/ConfigTestController.php
ConfigTestResourceTestBase.php in core/modules/config/tests/config_test/tests/src/Functional/Rest/ConfigTestResourceTestBase.php
ConfigTestTest.php in core/modules/jsonapi/tests/src/Functional/ConfigTestTest.php
config_test.hooks.inc in core/modules/config/tests/config_test/config_test.hooks.inc
Fake third-party hook implementations for ConfigTest entities.
DuplicatePluralizedMethodName.php in core/modules/config/tests/config_test/src/ConfigActionErrorEntity/DuplicatePluralizedMethodName.php
DuplicatePluralizedOtherMethodName.php in core/modules/config/tests/config_test/src/ConfigActionErrorEntity/DuplicatePluralizedOtherMethodName.php
RecipeRunnerTest.php in core/tests/Drupal/KernelTests/Core/Recipe/RecipeRunnerTest.php

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