Hans Leidekker (@hans) commented about dlls/secur32/tests/ntlm.c:
FreeContextBuffer(sec_pkg_info); if((ret = AcquireCredentialsHandleA(NULL, provider, SECPKG_CRED_OUTBOUND,
NULL, sspi_data->id, NULL, NULL, &sspi_data->cred, &ttl))
NULL, NULL, NULL, NULL, &sspi_data->cred, &ttl))
Authentication does succeed when 'fake' is true. It seems useful to keep that path with the fake credentials.