Question

我刚刚安装了rspec和rspec-mocks，但我无法运行最简单的设置

irb(main):001:0> require 'rspec'
=> true
irb(main):004:0> require 'rspec/mocks'
=> false
irb(main):006:0> RSpec::Mocks::setup(Object.new)
NameError: uninitialized constant BasicObject::RSpec
    from /usr/local/Cellar/ruby/1.9.1-p376/lib/ruby/gems/1.9.1/gems/rspec-mocks-2.13.0/lib/rspec/mocks.rb:60:in `block in add_extensions'
    from /usr/local/Cellar/ruby/1.9.1-p376/lib/ruby/gems/1.9.1/gems/rspec-mocks-2.13.0/lib/rspec/mocks.rb:60:in `class_eval'
    from /usr/local/Cellar/ruby/1.9.1-p376/lib/ruby/gems/1.9.1/gems/rspec-mocks-2.13.0/lib/rspec/mocks.rb:60:in `add_extensions'
    from /usr/local/Cellar/ruby/1.9.1-p376/lib/ruby/gems/1.9.1/gems/rspec-mocks-2.13.0/lib/rspec/mocks.rb:11:in `setup'
    from (irb):6
    from /usr/local/Cellar/ruby/1.9.1-p376/bin/irb:12:in `<main>'

我想知道可能出现什么问题，我是否需要加载其他宝石？

Answer 1

Jonathan走在正确的轨道上，但问题的根源是与1.8.7的不兼容，因为:: BasicObject仍然存在于Ruby 1.9中。

通过将 patch 限制为Ruby 1.8，可以更恰当地指定作者正在修补的适当解决方案：

def method_host
  # On 1.8.7, Object.ancestors.last == Kernel but
  # things blow up if we include `RSpec::Mocks::Methods`
  # into Kernel...not sure why.
  return Object unless defined?(::BasicObject) && RUBY_VERSION =~ /^1\.8\.\d+/

  # MacRuby has BasicObject but it's not the root class.
  return Object unless Object.ancestors.last == ::BasicObject

  ::BasicObject
end

Answer 2

如果你坚持使用Ruby 1.9.1，我想我已经为你找到了一个解决方案，但是一个警告 - 这是一个黑客攻击！

如果查看错误消息，则表示失败位于/lib/rspec/mocks.rb的第60行。我们来看看：https://github.com/rspec/rspec-mocks/blob/v2.13.0/lib/rspec/mocks.rb

def add_extensions
  method_host.class_eval { include RSpec::Mocks::Methods } # (line 60)
  Class.class_eval  { include RSpec::Mocks::AnyInstance }
  $_rspec_mocks_extensions_added = true
end

请注意，此私有方法的第一行（第60行）正在调用'method_host'。因此，让我们看看私有方法'method_host'中的几行：

def method_host
  # On 1.8.7, Object.ancestors.last == Kernel but
  # things blow up if we include `RSpec::Mocks::Methods`
  # into Kernel...not sure why.
  return Object unless defined?(::BasicObject)

  # MacRuby has BasicObject but it's not the root class.
  return Object unless Object.ancestors.last == ::BasicObject

  ::BasicObject
end

你可以看到有几个条件，它有时返回'Object'，否则返回'BasicObject'。所以，它让我想知道我们是否无法添加自己的条件。

return Object unless defined?(::BasicObject::RSpec)

我们可以通过创建一个文件来测试它，让我们称之为mocks_hack.rb，我们将重新定义'method_host'以包含我们的条件。

module RSpec
  module Mocks
    class << self

    private

      def method_host
        # On 1.8.7, Object.ancestors.last == Kernel but
        # things blow up if we include `RSpec::Mocks::Methods`
        # into Kernel...not sure why.
        return Object unless defined?(::BasicObject)

        # MacRuby has BasicObject but it's not the root class.
        return Object unless Object.ancestors.last == ::BasicObject

        # Jon's hack for Anurag Uniyal
        return Object unless defined?(::BasicObject::RSpec)

        ::BasicObject
      end
    end
  end
end

从mocks_hack.rb的当前目录中，启动irb和以下代码应该“正常”。

require 'rspec'
require './mocks_hack'
RSpec::Mocks::setup(Object.new)

现在，这带有免责声明 - 这是一个黑客攻击，我不完全明白做出这种改变可能带来的影响。希望它有所帮助并且是一种可行的解决方法。

Rspec / mocks引发未初始化的常量BasicObject :: RSpec

2 个答案: