9 files declare their use of JsonapiKernelTestBase

EntityResourceTest.php in core/modules/jsonapi/tests/src/Kernel/Controller/EntityResourceTest.php
FieldResolverTest.php in core/modules/jsonapi/tests/src/Kernel/Context/FieldResolverTest.php
FilterTest.php in core/modules/jsonapi/tests/src/Kernel/Query/FilterTest.php
JsonApiDocumentTopLevelNormalizerTest.php in core/modules/jsonapi/tests/src/Kernel/Normalizer/JsonApiDocumentTopLevelNormalizerTest.php
RelatedResourceTypesTest.php in core/modules/jsonapi/tests/src/Kernel/ResourceType/RelatedResourceTypesTest.php
RelationshipNormalizerTest.php in core/modules/jsonapi/tests/src/Kernel/Normalizer/RelationshipNormalizerTest.php
ResourceTypeRepositoryTest.php in core/modules/jsonapi/tests/src/Kernel/ResourceType/ResourceTypeRepositoryTest.php
SerializerTest.php in core/modules/jsonapi/tests/src/Kernel/Serializer/SerializerTest.php
VersionNegotiatorTest.php in core/modules/jsonapi/tests/src/Kernel/Revisions/VersionNegotiatorTest.php

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