15 files declare their use of ValidationResult in Automatic Updates 8.2

ComposerExecutableValidator.php in src/Validator/ComposerExecutableValidator.php

ComposerExecutableValidatorTest.php in tests/src/Kernel/ReadinessValidation/ComposerExecutableValidatorTest.php

CoreComposerValidator.php in src/Validator/CoreComposerValidator.php

CoreComposerValidatorTest.php in tests/src/Kernel/ReadinessValidation/CoreComposerValidatorTest.php

DiskSpaceValidator.php in src/Validator/DiskSpaceValidator.php

DiskSpaceValidatorTest.php in tests/src/Kernel/ReadinessValidation/DiskSpaceValidatorTest.php

PendingUpdatesValidator.php in src/Validator/PendingUpdatesValidator.php

PendingUpdatesValidatorTest.php in tests/src/Kernel/ReadinessValidation/PendingUpdatesValidatorTest.php

StagedProjectsValidator.php in src/Validator/StagedProjectsValidator.php

UpdateEvent.php in src/Event/UpdateEvent.php

UpdaterFormTest.php in tests/src/Functional/UpdaterFormTest.php

UpdateVersionValidator.php in src/Validator/UpdateVersionValidator.php

ValidationResultTest.php in tests/src/Unit/ValidationResultTest.php

ValidationTestTrait.php in tests/src/Traits/ValidationTestTrait.php

WritableFileSystemValidator.php in src/Validator/WritableFileSystemValidator.php