22 files declare their use of GraphQLTestBase in GraphQL 8.3

BufferedFieldTest.php in tests/src/Kernel/Framework/BufferedFieldTest.php

DisabledResultCacheTest.php in tests/src/Kernel/Framework/DisabledResultCacheTest.php

DisabledSchemaCacheTest.php in tests/src/Kernel/Framework/DisabledSchemaCacheTest.php

EnumTest.php in tests/src/Kernel/Extension/EnumTest.php

FieldTest.php in tests/src/Kernel/Extension/FieldTest.php

GraphQLCoreTestBase.php in modules/graphql_core/tests/src/Kernel/GraphQLCoreTestBase.php

InvalidPayloadTest.php in tests/src/Kernel/Framework/InvalidPayloadTest.php

LanguageContextTest.php in tests/src/Kernel/Framework/LanguageContextTest.php

MutationTest.php in tests/src/Kernel/Extension/MutationTest.php

OverrideFieldTest.php in tests/src/Kernel/Extension/OverrideFieldTest.php

OverrideTypeTest.php in tests/src/Kernel/Extension/OverrideTypeTest.php

PermissionsTest.php in tests/src/Kernel/Framework/PermissionsTest.php

RecursiveTypeTest.php in tests/src/Kernel/Extension/RecursiveTypeTest.php

ResolveContextTest.php in tests/src/Kernel/Extension/ResolveContextTest.php

ResultCacheTest.php in tests/src/Kernel/Framework/ResultCacheTest.php

ResultTest.php in tests/src/Kernel/Framework/ResultTest.php

SchemaCacheTest.php in tests/src/Kernel/Framework/SchemaCacheTest.php

SecureFieldTest.php in tests/src/Kernel/Framework/SecureFieldTest.php

TestFrameworkTest.php in tests/src/Kernel/Framework/TestFrameworkTest.php

TypeTest.php in tests/src/Kernel/Extension/TypeTest.php

UploadMutationTest.php in tests/src/Kernel/Framework/UploadMutationTest.php

UserPermissionsContextTest.php in tests/src/Kernel/Framework/UserPermissionsContextTest.php