Why does phpunit show full coverage?

Question

symfony

Please tell me why and under what conditions the code coverage report in phpunit contains empty (white) lines marked as n/a.
such methods generate an erroneous coverage report that reports 100% coverage when in fact only 1 method has completed (green).
Additional data:
phpunit 6.2.2
Xdebug 2.4.0
php-7.0
file ~6000 lines (please do not discuss this topic, I am not the author of this file)

Answer 1

Shows that everything is covered for the reason that most likely you have interfaces / constructors, etc. there.
Accordingly, there is no implementation, and there is nothing to cover.