ruby - Rails spring testunit Bad file descriptor -

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i'm trying use spring 1.4.0 rails 3.2.22/ruby 2.2.5, , doing :

bundle exec spring testunit <test_file.rb>

outputs :

/users/igor/.rbenv/versions/2.2.5/gemsets/<app>/gems/spring-1.4.0/lib/spring/application/boot.rb:7:in 'for_fd': bad file descriptor - not socket file descriptor (errno::ebadf) /users/igor/.rbenv/versions/2.2.5/gemsets/<app>/gems/spring-1.4.0/lib/spring/application/boot.rb:7:in '<top (required)>' -e:1:in 'require' -e:1:in '<main>'

from gathered in spring source code, faulty instruction unixsocket.for_fd(3), should first available file handle, why caught bad file descriptor ?

any appreciated, !


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