rake test:c on mongo-ruby-driver against rbx-head-19mode

gistfile1.txt

install -c tmp/x86_64-unknown-linux-gnu/cbson/1.9.3/cbson.so lib/bson_ext/cbson.so
Loaded suite /home/razielgn/.rvm/gems/rbx-head-d19@global/gems/rake-10.0.0/lib/rake/rake_test_loader
Started
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Finished in 43.938934 seconds.

269 tests, 3872 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed

6.12 tests/s, 88.12 assertions/s
Loaded suite /home/razielgn/.rvm/gems/rbx-head-d19@global/gems/rake-10.0.0/lib/rake/rake_test_loader
Started
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Finished in 0.523068 seconds.

106 tests, 252 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed

202.65 tests/s, 481.77 assertions/s
Loaded suite /home/razielgn/.rvm/gems/rbx-head-d19@global/gems/rake-10.0.0/lib/rake/rake_test_loader
Started
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===============================================================================
Failure:
test_generation_time(ObjectIdTest)
/home/razielgn/dev/repos/mongo-ruby-driver/test/bson/object_id_test.rb:106:in `test_generation_time'
     103:     generated_time = id.generation_time
     104: 
     105:     assert_in_delta time.to_i, generated_time.to_i, 2
  => 106:     assert_equal "UTC", generated_time.zone
     107:   end
     108: 
     109:   def test_from_time
/home/razielgn/.rvm/gems/rbx-head-d19/gems/mocha-0.12.7/lib/mocha/integration/test_unit/gem_version_230_to_252.rb:25:in `run'
<"UTC">(US-ASCII) expected but was
<"GMT">(ASCII-8BIT)

diff:
? U TC
? GM  
  
? Encoding: US-ASCII-8BIT
===============================================================================
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Finished in 0.478835 seconds.

137 tests, 301 assertions, 1 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
99.2701% passed

286.11 tests/s, 628.61 assertions/s
Loaded suite /home/razielgn/.rvm/gems/rbx-head-d19@global/gems/rake-10.0.0/lib/rake/rake_test_loader
Started
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Finished in 1.230569 seconds.

3 tests, 242 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed

2.44 tests/s, 196.66 assertions/s
[CLEAN-UP] Dropping test databases...