9 files declare their use of OgMembershipCreationTrait in Organic groups 8

AccessByOgMembershipTest.php in tests/src/Kernel/Access/AccessByOgMembershipTest.php

ActionTestBase.php in tests/src/Kernel/Action/ActionTestBase.php

GetMembershipsTest.php in tests/src/Kernel/Entity/GetMembershipsTest.php

GetUserGroupsTest.php in tests/src/Kernel/Entity/GetUserGroupsTest.php

GroupMembershipManagerTest.php in tests/src/Kernel/Entity/GroupMembershipManagerTest.php

GroupSubscribeTest.php in tests/src/Functional/GroupSubscribeTest.php

MemberCountBlockTest.php in tests/src/Kernel/Plugin/Block/MemberCountBlockTest.php

OgAccessHookTest.php in tests/src/Kernel/Access/OgAccessHookTest.php

OgGroupContentOperationAccessTest.php in tests/src/Kernel/Access/OgGroupContentOperationAccessTest.php