matches?

# File lib/spec/matchers/change.rb, line 13
      def matches?(event_proc)
        raise_block_syntax_error if block_given?
        
        @before = evaluate_value_proc
        event_proc.call
        @after = evaluate_value_proc
        
        return false if @from unless @from == @before
        return false if @to unless @to == @after
        return (@before + @amount == @after) if @amount
        return ((@after - @before) >= @minimum) if @minimum
        return ((@after - @before) <= @maximum) if @maximum        
        return @before != @after
      end