7 files declare their use of MockFileFinder

AnnotatedClassDiscovery.php in core/lib/Drupal/Component/Annotation/Plugin/Discovery/AnnotatedClassDiscovery.php
AnnotatedClassDiscoveryAutomatedProviders.php in core/modules/migrate/src/Plugin/Discovery/AnnotatedClassDiscoveryAutomatedProviders.php
AttributeDiscoveryWithAnnotations.php in core/lib/Drupal/Core/Plugin/Discovery/AttributeDiscoveryWithAnnotations.php
HookCollectorPass.php in core/lib/Drupal/Core/Hook/HookCollectorPass.php
MockFileFinderTest.php in core/tests/Drupal/Tests/Component/Annotation/MockFileFinderTest.php
StaticReflectionParserTest.php in core/tests/Drupal/Tests/Component/Annotation/Doctrine/StaticReflectionParserTest.php
TestDiscovery.php in core/lib/Drupal/Core/Test/TestDiscovery.php

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