35 files declare their use of ContextDefinition in Drupal 9

ContextAwarePluginBaseTest.php in core/tests/Drupal/KernelTests/Core/Plugin/Context/ContextAwarePluginBaseTest.php

ContextAwarePluginTraitTest.php in core/tests/Drupal/KernelTests/Core/Plugin/Context/ContextAwarePluginTraitTest.php

ContextDefinitionIsSatisfiedTest.php in core/tests/Drupal/Tests/Core/Plugin/Context/ContextDefinitionIsSatisfiedTest.php

ContextDefinitionTest.php in core/tests/Drupal/KernelTests/Core/Plugin/ContextDefinitionTest.php

ContextDefinitionTest.php in core/tests/Drupal/Tests/Core/Plugin/Context/ContextDefinitionTest.php

ContextDefinitionTest.php in core/tests/Drupal/KernelTests/Core/Plugin/Annotation/ContextDefinitionTest.php

ContextHandlerTest.php in core/tests/Drupal/Tests/Core/Plugin/ContextHandlerTest.php

Contains \Drupal\Tests\Core\Plugin\ContextHandlerTest.

ContextTypedDataTest.php in core/tests/Drupal/KernelTests/Core/Plugin/ContextTypedDataTest.php

CurrentLanguageContext.php in core/lib/Drupal/Core/Language/ContextProvider/CurrentLanguageContext.php

DefaultsSectionStorageTest.php in core/modules/layout_builder/tests/src/Unit/DefaultsSectionStorageTest.php

DefaultsSectionStorageTest.php in core/modules/layout_builder/tests/src/Kernel/DefaultsSectionStorageTest.php

EntityContextDefinitionIsSatisfiedTest.php in core/tests/Drupal/Tests/Core/Plugin/Context/EntityContextDefinitionIsSatisfiedTest.php

EntityConverter.php in core/lib/Drupal/Core/ParamConverter/EntityConverter.php

EntityConverterTest.php in core/tests/Drupal/Tests/Core/ParamConverter/EntityConverterTest.php

EntityRepositoryTest.php in core/tests/Drupal/KernelTests/Core/Entity/EntityRepositoryTest.php

FakeViewModeContext.php in core/modules/layout_builder/tests/modules/layout_builder_fieldblock_test/src/ContextProvider/FakeViewModeContext.php

FieldBlockDeriver.php in core/modules/layout_builder/src/Plugin/Derivative/FieldBlockDeriver.php

FieldBlockTest.php in core/modules/layout_builder/tests/src/Kernel/FieldBlockTest.php

IHaveRuntimeContexts.php in core/modules/layout_builder/tests/modules/layout_builder_test/src/ContextProvider/IHaveRuntimeContexts.php

InheritedContextDefinition.php in core/tests/Drupal/Tests/Core/Plugin/Fixtures/InheritedContextDefinition.php

LayoutBuilderEntityViewDisplay.php in core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php

LayoutEntityHelperTrait.php in core/modules/layout_builder/src/LayoutEntityHelperTrait.php

LazyContextRepositoryTest.php in core/tests/Drupal/Tests/Core/Plugin/Context/LazyContextRepositoryTest.php

MockBlockManager.php in core/modules/system/tests/modules/plugin_test/src/Plugin/MockBlockManager.php

NumericArgument.php in core/modules/views/src/Plugin/views/argument/NumericArgument.php

NumericArgumentValidator.php in core/modules/views/src/Plugin/views/argument_validator/NumericArgumentValidator.php

OverridesSectionStorage.php in core/modules/layout_builder/src/Plugin/SectionStorage/OverridesSectionStorage.php

OverridesSectionStorageTest.php in core/modules/layout_builder/tests/src/Kernel/OverridesSectionStorageTest.php

QuickEditIntegration.php in core/modules/layout_builder/src/QuickEditIntegration.php

SectionStorageBase.php in core/modules/layout_builder/src/Plugin/SectionStorage/SectionStorageBase.php

SectionStorageManagerTest.php in core/modules/layout_builder/tests/src/Unit/SectionStorageManagerTest.php

SimpleConfigSectionListTest.php in core/modules/layout_builder/tests/src/Kernel/SimpleConfigSectionListTest.php

SimpleConfigSectionStorage.php in core/modules/layout_builder/tests/modules/layout_builder_test/src/Plugin/SectionStorage/SimpleConfigSectionStorage.php

StringArgument.php in core/modules/views/src/Plugin/views/argument/StringArgument.php

TestPageDisplayVariantSubscriber.php in core/modules/system/tests/modules/display_variant_test/src/EventSubscriber/TestPageDisplayVariantSubscriber.php