lib directory is included by default in Rake::TestTask so it is not necessary to explictly specifying it.
lib directory is included by default in Rake::TestTask so it is not
necessary to explictly specifying it.

Before removing it, running rake shows:
zlu-mba:blather zlu$ rake
(in /Users/zlu/projects/thelab/blather)
/Users/zlu/.rvm/rubies/ree-1.8.7-2011.03/bin/ruby -I"lib:lib:spec" "/Users/zlu/.rvm/gems/ree-1.8.7-2011.03@global/gems/rake-0.8.7/lib/rake/rake_test_loader.rb" "spec/blather/client/client_spec.rb"

Note that -I includes 2 lib.

1st8/blather,1st8/blather