Ruby on rails 如何使用FlexMock哈希匹配器验证数组值的一部分？

我试图验证我的Rails代码是否调用ActiveRecord的all方法（对于find:all，all是语法糖），如下所示：

      records = Record.all
        :limit => RECORD_LIMIT, :offset => record_offset,
        :select => 'id',
        :conditions => [ 'record_type = ? AND content_score >= ?', 'user', min_content_score ],
        :order => 'content_score DESC'

mock.should_receive(:all).with FlexMock.hsh [ 'record_type = ? AND content_score >= ?', Object, Object ]

mock.should_receive( :all ).
  with( Flexmock.key( :conditions ) ).
  and_return []

在这个实例中，我关心的代码的唯一部分是：conditions参数，我只关心SQL代码段，而不关心绑定变量的实际值。我可以使用FlexMock哈希匹配器断言（至少）存在：conditions参数，如下所示：

mock.should_receive(:all).with FlexMock.hsh :conditions => []

mock.should_receive(:all).
  with( HashKeyMatcher.new( :conditions ) ).
  and_return []

但是，这只匹配：conditions参数的值为空数组的调用。我真正想要的是这样的东西：

      records = Record.all
        :limit => RECORD_LIMIT, :offset => record_offset,
        :select => 'id',
        :conditions => [ 'record_type = ? AND content_score >= ?', 'user', min_content_score ],
        :order => 'content_score DESC'

mock.should_receive(:all).with FlexMock.hsh [ 'record_type = ? AND content_score >= ?', Object, Object ]

mock.should_receive( :all ).
  with( Flexmock.key( :conditions ) ).
  and_return []

但不幸的是，正如irb所揭示的，“用户”和“对象”并不等同：

>> '' === Object

---

有什么好主意吗？嵌套匹配器是否可行？

解决此问题需要猴子修补FlexMock和一个对象，因此不适合心脏虚弱的人。：）

首先，monkey patch FlexMock:：HashMatcher在期望对象而不是实际对象上调用==：

class FlexMock::HashMatcher
  def ===(target)
    @hash.all? { |k, v| v == target[k] }
  end
end

接下来，构造一个对象并重新定义其==方法：

conditions_matcher = Object.new
conditions_matcher.instance_eval do
  def ==(other)
    other.first == 'record_type = ? AND content_score >= ?'
  end
end

最后，设置您的FlexMock期望值：

mock.should_receive(:all).
    with(FlexMock.hsh(:conditions => conditions_matcher)).
    and_return []

这适用于以下所有调用：

Record.all :conditions => [ 'record_type = ? AND content_score >= ?' ]
Record.all :conditions => [ 'record_type = ? AND content_score >= ?', 'foo' ]
Record.all :conditions => [ 'record_type = ? AND content_score >= ?', 'foo', 5.0 ]

---

鲁比是个疯子，但在某种程度上是好的

鸭子出击这应该不是必要的。您可以非常轻松地定义自己的参数匹配器：

class HashKeyMatcher
  def initialize( key )
    @key = key
  end

  def ===( other )
    other.respond_to?( :keys ) && other.keys.include? @key
  end

  def inspect() "HashKeyMatcher( #{@key.inspect} )"; end
end

然后你就这样使用它：

mock.should_receive(:all).with FlexMock.hsh :conditions => []

mock.should_receive(:all).
  with( HashKeyMatcher.new( :conditions ) ).
  and_return []

将HashKeyMatcher放在可以从测试访问的地方

如果愿意，可以通过打开Flexmock类并添加新方法，以类似于其他Flexmock参数匹配器的方式使其可用：

class Flexmock
  def self.key( hash_key )
    HashKeyMatcher.new hash_key
  end
end

然后您可以这样编写测试：

      records = Record.all
        :limit => RECORD_LIMIT, :offset => record_offset,
        :select => 'id',
        :conditions => [ 'record_type = ? AND content_score >= ?', 'user', min_content_score ],
        :order => 'content_score DESC'

mock.should_receive(:all).with FlexMock.hsh [ 'record_type = ? AND content_score >= ?', Object, Object ]

mock.should_receive( :all ).
  with( Flexmock.key( :conditions ) ).
  and_return []

---

啊。。。源代码似乎表明我想要做的是不可能的：除非我可以重写right==方法。。。请继续关注。如果只将FlexMock:：HashMatcher#===方法定义为“@hash.all？{k，v | v==target[k]}”，我对==的猴子补丁就可以了。也许是时候开公开课了。好吧，我比我疯狂的解决方案更喜欢这个。谢谢