When Beta 1 was released the testing snapshots for Fedora disappeared, but the Beta 1 packages did not take their place. The repo info files exist, but there are currently no rpms in: https://download.postgresql.org/pub/repos/yum/testing/10/fedora/fedora-25-x86_64/
pgsql-pkg-yum by date:
Соглашаюсь с условиями обработки персональных данных