6 files declare their use of JsonapiKernelTestBase in Drupal 10

FieldItemNormalizerTest.php in core/modules/jsonapi/tests/src/Kernel/Normalizer/FieldItemNormalizerTest.php

FieldResolverTest.php in core/modules/jsonapi/tests/src/Kernel/Context/FieldResolverTest.php

RelatedResourceTypesTest.php in core/modules/jsonapi/tests/src/Kernel/ResourceType/RelatedResourceTypesTest.php

ResourceTypeRepositoryTest.php in core/modules/jsonapi/tests/src/Kernel/ResourceType/ResourceTypeRepositoryTest.php

TemporaryJsonapiFileFieldUploaderTest.php in core/modules/jsonapi/tests/src/Kernel/Controller/TemporaryJsonapiFileFieldUploaderTest.php

VersionNegotiatorTest.php in core/modules/jsonapi/tests/src/Kernel/Revisions/VersionNegotiatorTest.php