NameError：升级到rails3时出现未初始化常量Test::Unit::AssertionFailedError

Question

我正在尝试将我的 Rails 应用程序升级到 Rails3。

当我运行功能测试时，我收到很多 NameError: uninitializedconstant Test::Unit::AssertionFailedError 错误。但单元测试和网站本身似乎运行良好。

Trace 看起来像这样：

NameError: uninitialized constant Test::Unit::AssertionFailedError
/Users/mantas/.rvm/gems/ruby-1.9.2-p0/gems/aws-s3-0.6.2/lib/aws/s3/extensions.rb:206:in `const_missing_from_s3_library'
/Users/mantas/.rvm/gems/ruby-1.9.2-p0/bundler/gems/shoulda-02520e4/lib/shoulda/action_controller/matchers/redirect_to_matcher.rb:52:in `rescue in redirects_to_url?'
/Users/mantas/.rvm/gems/ruby-1.9.2-p0/bundler/gems/shoulda-02520e4/lib/shoulda/action_controller/matchers/redirect_to_matcher.rb:48:in `redirects_to_url?'
/Users/mantas/.rvm/gems/ruby-1.9.2-p0/bundler/gems/shoulda-02520e4/lib/shoulda/action_controller/matchers/redirect_to_matcher.rb:35:in `matches?'
/Users/mantas/.rvm/gems/ruby-1.9.2-p0/bundler/gems/shoulda-02520e4/lib/shoulda/assertions.rb:53:in `assert_accepts'
/Users/mantas/.rvm/gems/ruby-1.9.2-p0/bundler/gems/shoulda-02520e4/lib/shoulda/context.rb:324:in `block in should'
/Users/mantas/.rvm/gems/ruby-1.9.2-p0/bundler/gems/shoulda-02520e4/lib/shoulda/context.rb:382:in `call'
/Users/mantas/.rvm/gems/ruby-1.9.2-p0/bundler/gems/shoulda-02520e4/lib/shoulda/context.rb:382:in `block in create_test_from_should_hash'

Shoulda 和 Amazon S3 gems 都是最新版本。

有什么想法我做错了吗？

Answer 1

已报告此问题 http://github.com/thoughtbot/shoulda/issues/issue/ 117.。

解决方法（至少让这个错误消失，不确定它是否实际上正常工作）是：

unless defined?(Test::Unit::AssertionFailedError)
  class Test::Unit::AssertionFailedError < ActiveSupport::TestCase::Assertion
  end
end

Answer 2

Ash Berlin 的解决方案将使异常消失，但它会使任何 try 和 catch Test::Unit::AssertionFailedError 的匹配器失败。如果 AssertionFailedError 是 ActiveSupport::TestCase::Assertion，并且您抛出 ActiveSupport::TestCase::Assertion，您将无法捕获它作为 Test::Unit::AssertionFailedError。他的继承关系是倒退的。相反，请将其放入您的 test_helper.rb 中：

unless defined?(Test::Unit::AssertionFailedError)
  Test::Unit::AssertionFailedError = ActiveSupport::TestCase::Assertion
end