7 files declare their use of TestKernel

ConfigEntityBaseUnitTest.php in core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityBaseUnitTest.php
Contains \Drupal\Tests\Core\Config\Entity\ConfigEntityBaseUnitTest.
ContextHandlerTest.php in core/tests/Drupal/Tests/Core/Plugin/ContextHandlerTest.php
Contains \Drupal\Tests\Core\Plugin\ContextHandlerTest.
DependencySerializationTest.php in core/tests/Drupal/Tests/Core/DependencyInjection/DependencySerializationTest.php
Contains \Drupal\Tests\Core\DependencyInjection\DependencySerializationTest.
DrupalKernelTest.php in core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php
http.php in core/modules/system/tests/http.php
Fake an HTTP request, for use during testing.
https.php in core/modules/system/tests/https.php
Fake an HTTPS request, for use during testing.
SharedTempStoreTest.php in core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php

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