6 files declare their use of KernelTestBasePlugin in IMCE 8

CoreTest.php in tests/src/Kernel/Plugin/ImcePlugin/CoreTest.php

DeleteTest.php in tests/src/Kernel/Plugin/ImcePlugin/DeleteTest.php

ImceFolderTest.php in tests/src/Kernel/ImceFolderTest.php

NewFolderTest.php in tests/src/Kernel/Plugin/ImcePlugin/NewFolderTest.php

ResizeTest.php in tests/src/Kernel/Plugin/ImcePlugin/ResizeTest.php

UploadTest.php in tests/src/Kernel/Plugin/ImcePlugin/UploadTest.php