6 files declare their use of ResourceTestBase

DbLogResourceTest.php in core/modules/hal/tests/src/Functional/dblog/DbLogResourceTest.php
EntityResourceTestBase.php in core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
LayoutRestTestBase.php in core/modules/layout_builder/tests/src/Functional/Rest/LayoutRestTestBase.php
RestJsonApiUnsupported.php in core/modules/jsonapi/tests/src/Functional/RestJsonApiUnsupported.php
RestRegisterUserTest.php in core/modules/hal/tests/src/Functional/user/RestRegisterUserTest.php
UserRegistrationRestTest.php in core/modules/user/tests/src/Functional/UserRegistrationRestTest.php

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