8 files declare their use of RunnerVersion

AfterSymfonyListener.php in core/tests/Drupal/Tests/Listeners/AfterSymfonyListener.php
Listens to PHPUnit test runs.
DrupalListener.php in core/tests/Drupal/Tests/Listeners/DrupalListener.php
Listens to PHPUnit test runs.
FileFieldTestBase.php in core/modules/file/tests/src/Functional/FileFieldTestBase.php
FileFieldValidateTest.php in core/modules/file/tests/src/Functional/FileFieldValidateTest.php
HtmlOutputPrinter.php in core/tests/Drupal/Tests/Listeners/HtmlOutputPrinter.php
Defines a class for providing html output results for functional tests.
PhpunitCompatibilityTrait.php in core/tests/Drupal/Tests/PhpunitCompatibilityTrait.php
SimpletestUiPrinter.php in core/tests/Drupal/Tests/Listeners/SimpletestUiPrinter.php
Defines a class for providing html output links in the Simpletest UI.
TestSuiteBaseTest.php in core/tests/Drupal/Tests/Core/Test/TestSuiteBaseTest.php

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