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`xwfb-run` fails with error removing directory

Trying to use xwfb-run for Alexandria package in Fedora [1], execution of the test suite with Mutter fails:

$ xwfb-run -c mutter -e error.log -- rake spec:unit
/usr/bin/ruby -rbundler/setup -rsimplecov -Ilib -w -I/usr/share/gems/gems/rspec-support-3.13.1/lib:/usr/share/gems/gems/rspec-core-3.13.0/lib /usr/share/gems/gems/rspec-core-3.13.0/exe/rspec --pattern spec/alexandria/\*\*/\*_spec.rb
*****...*................................................**.........Error removing directory /tmp/tmpjcjec9e4: [Errno 39] Directory not empty: '/tmp/tmpjcjec9e4'

This is the content of the directory in question:

$ find ./tmp/tmpjcjec9e4/
./tmp/tmpjcjec9e4/
./tmp/tmpjcjec9e4/dbus-1
./tmp/tmpjcjec9e4/dbus-1/services

It seems that these are some residues of dbus-run-session command.

Using Weston, it works just fine:

+ xwfb-run -c weston -e error.log -- rake spec:unit
/usr/bin/ruby -rbundler/setup -rsimplecov -Ilib -w -I/usr/share/gems/gems/rspec-support-3.13.1/lib:/usr/share/gems/gems/rspec-core-3.13.0/lib /usr/share/gems/gems/rspec-core-3.13.0/exe/rspec --pattern spec/alexandria/\*\*/\*_spec.rb
*****...*................................................**.........................................................

Pending: (Failures listed here are expected and do not affect your suite's status)

  1) Alexandria::BookProviders::BLProvider works
     # Temporarily skipped with xit
     # ./spec/alexandria/book_providers/bl_provider_spec.rb:10

  2) Alexandria::BookProviders::LOCProvider works for a book with ASCII title
     # Temporarily skipped with xit
     # ./spec/alexandria/book_providers/loc_provider_spec.rb:10

  3) Alexandria::BookProviders::LOCProvider works for a book with a title with non-ASCII letters
     # Temporarily skipped with xit
     # ./spec/alexandria/book_providers/loc_provider_spec.rb:14

  4) Alexandria::BookProviders::SBNProvider works
     # Temporarily skipped with xit
     # ./spec/alexandria/book_providers/sbn_provider_spec.rb:10

  5) Alexandria::BookProviders::ThaliaProvider works when searching by ISBN
     # Temporarily skipped with xit
     # ./spec/alexandria/book_providers/thalia_provider_spec.rb:110

  6) Alexandria::BookProviders should be less clever
     # Not yet implemented
     # ./spec/alexandria/book_providers_spec.rb:10

  7) Alexandria::Scanners::CueCat decodes ISSN barcodes
     # Test scan ISSN
     # ./spec/alexandria/scanners/cue_cat_spec.rb:45

  8) Alexandria::Scanners::CueCat decodes UPC barcodes
     # Test scan UPC
     # ./spec/alexandria/scanners/cue_cat_spec.rb:49

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116 examples, 0 failures, 8 pending