ruby-lxc-test-failure

 vagrant@vagrant-ubuntu-trusty-64  /vagrant   master  r test
/home/vagrant/.rbenv/versions/2.1.5/bin/ruby -I"lib:test" -I"/home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib" "/home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/rake_test_loader.rb" "test/test_helpers.rb" "test/test_lxc_class_methods.rb" "test/test_lxc_create_asynchronous.rb" "test/test_lxc_created.rb" "test/test_lxc_long_running.rb" "test/test_lxc_running.rb" "test/test_lxc_undefined.rb"
/vagrant/lib/lxc.rb:2:in `require': cannot load such file -- lxc/lxc (LoadError)
	from /vagrant/lib/lxc.rb:2:in `<top (required)>'
	from /vagrant/test/test_helpers.rb:1:in `require'
	from /vagrant/test/test_helpers.rb:1:in `<top (required)>'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/rake_test_loader.rb:15:in `require'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/rake_test_loader.rb:15:in `block in <main>'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/rake_test_loader.rb:4:in `select'
	from /home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/rake_test_loader.rb:4:in `<main>'
rake aborted!
Command failed with status (1): [ruby -I"lib:test" -I"/home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib" "/home/vagrant/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/rake_test_loader.rb" "test/test_helpers.rb" "test/test_lxc_class_methods.rb" "test/test_lxc_create_asynchronous.rb" "test/test_lxc_created.rb" "test/test_lxc_long_running.rb" "test/test_lxc_running.rb" "test/test_lxc_undefined.rb" ]

Tasks: TOP => test
(See full trace by running task with --trace)

do you have any other lxc gem installed? what does gem list show ?