以下是我在运行使用rpsec编写的测试用例时收到的错误。奇怪的是，测试一直运行到昨天早些时候。有人可以指导我寻求解决方案。我是RSpec的新手，并且在我的应用程序中使用Rspec和rspec-rails作为插件。我不知道出了什么问题。
F:/Spritle/programs/ruby 1.86/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_suppor
t/dependencies.rb:105:in `const_missing': uninitialized constant Test::Unit::TestResult::TestResultFailureSupport (NameError)
from F:/Spritle/programs/ruby 1.86/lib/ruby/gems/1.8/gems/test-unit-2.0.1/lib/test/unit/testresult.rb:28
from F:/Spritle/programs/ruby 1.86/lib/ruby/site_ruby/1.8/rubygems/custom_require.
rb:31:in `gem_original_require'
from F:/Spritle/programs/ruby 1.86/lib/ruby/site_ruby/1.8/rubygems/custom_require.
rb:31:in `require'
from F:/Spritle/programs/ruby 1.86/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/
active_support/dependencies.rb:158:in `require'
from F:/Spritle/projects/Evaluation/vendor/plugins/rspec/lib/spec/interop/test.rb:
34
from F:/Spritle/programs/ruby 1.86/lib/ruby/site_ruby/1.8/rubygems/custom_require.
rb:31:in `gem_original_require'
from F:/Spritle/programs/ruby 1.86/lib/ruby/site_ruby/1.8/rubygems/custom_require.
rb:31:in `require'
from F:/Spritle/programs/ruby 1.86/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/
active_support/dependencies.rb:158:in `require'
... 15 levels...
from F:/Spritle/projects/Evaluation/vendor/plugins/rspec/lib/spec/runner/example_g
roup_runner.rb:14:in `load_files'
from F:/Spritle/projects/Evaluation/vendor/plugins/rspec/lib/spec/runner/options.r
b:133:in `run_examples'
from F:/Spritle/projects/Evaluation/vendor/plugins/rspec/lib/spec/runner/command_l
ine.rb:9:in `run'
from F:/Spritle/projects/Evaluation/vendor/plugins/rspec/bin/spec:5
rake aborted!
Command "F:/Spritle/programs/ruby 1.86/bin/ruby.exe" -I"lib" "F:/Spritle/projects/Evaluation/vendor/plugins/rspec/bin/spec" "spec/controllers/articles_controller_spec.rb" --option
s "F:/Spritle/projects/Evaluation/spec/spec.opts" failed