17 files declare their use of Time

AliasManagerTest.php in core/modules/path_alias/tests/src/Unit/AliasManagerTest.php
AssetResolverTest.php in core/tests/Drupal/Tests/Core/Asset/AssetResolverTest.php
BackendChainImplementationUnitTest.php in core/tests/Drupal/Tests/Core/Cache/BackendChainImplementationUnitTest.php
ChainedFastBackendTest.php in core/tests/Drupal/Tests/Core/Cache/ChainedFastBackendTest.php
CheckpointStorageTest.php in core/tests/Drupal/Tests/Core/Config/Checkpoint/CheckpointStorageTest.php
ConfigEntityStorageTest.php in core/tests/Drupal/Tests/Core/Config/Entity/ConfigEntityStorageTest.php
KeyValueEntityStorageTest.php in core/tests/Drupal/Tests/Core/Entity/KeyValueStore/KeyValueEntityStorageTest.php
NormalInstallerServiceProvider.php in core/lib/Drupal/Core/Installer/NormalInstallerServiceProvider.php
RendererBubblingTest.php in core/tests/Drupal/Tests/Core/Render/RendererBubblingTest.php
RendererTestBase.php in core/tests/Drupal/Tests/Core/Render/RendererTestBase.php
SqlContentEntityStorageTest.php in core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageTest.php
StageBaseTest.php in core/modules/package_manager/tests/src/Kernel/StageBaseTest.php
StorageComparer.php in core/lib/Drupal/Core/Config/StorageComparer.php
TestTime.php in core/modules/update/tests/modules/update_test/src/Datetime/TestTime.php
TimeTest.php in core/tests/Drupal/Tests/Component/Datetime/TimeTest.php
TimeWithNoRequestTest.php in core/tests/Drupal/Tests/Component/Datetime/TimeWithNoRequestTest.php
VariationCacheTest.php in core/tests/Drupal/Tests/Core/Cache/VariationCacheTest.php

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