Exclude external stone warnings when running rake test in Rails

I am trying to configure cloud9 ( https://c9.io ) to install a test installation of my Rails 3.2 application so that new developers can quickly launch it and run it to submit the changes and run the tests. All my tests pass, but they mix with many caveats associated with different gems:

Loaded suite /usr/local/rvm/gems/ruby-2.1.2/gems/rake-11.1.1/lib/rake/rake_test_loader
Started
......

Finished in 0.22973343 seconds.
------
6 tests, 10 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
0% passed
------
26.12 tests / s, 43.53 assertions / s
Loaded suite /usr/local/rvm/gems/ruby-2.1.2/gems/rake-11.1.1/lib/rake/rake_test_loader
Started
............................................

Finished in 4.18306875 seconds.
------
44 tests, 77 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
/usr/local/rvm/gems/ruby-2.1.2/gems/composite_primary_keys-5.0.14/lib/composite_primary_keys/relation.rb:26: warning: previous definition of destroy was here
/usr/local/rvm/gems/ruby-2.1.2/gems/composite_primary_keys-5.0.14/lib/composite_primary_keys/relation.rb:10: warning: method redefined; discarding old delete
/usr/local/rvm/gems/ruby-2.1.2/gems/composite_primary_keys-5.0.14/lib/composite_primary_keys/relation.rb:10: warning: previous definition of delete was here
/usr/local/rvm/gems/ruby-2.1.2/gems/composite_primary_keys-5.0.14/lib/composite_primary_keys/relation.rb:26: warning: method redefined; discarding old destroy

... .

Ubuntu/Debian , , .

, ?

+4
1

: Ruby

RUBYOPT=W0 rake test, (crouton, ARM) Ubuntu 14 RVM.

+3

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