Refactor metadata_filter to make rubocop pass.

Author: Tim Mertens

lib/rspec/core/metadata_filter.rb

@@ -27,11 +27,7 @@ def filter_applies?(key, value, metadata)
             when Regexp
               metadata[key] =~ value
             when Proc
-              case value.arity
-              when 0 then value.call
-              when 2 then value.call(metadata[key], metadata)
-              else value.call(metadata[key])
-              end
+              proc_filter_applies?(key, value, metadata)
             else
               metadata[key].to_s == value.to_s
             end
@@ -62,6 +58,14 @@ def line_number_filter_applies?(line_numbers, metadata)
           !(relevant_line_numbers(metadata) & preceding_declaration_lines).empty?
         end
 
+        def proc_filter_applies?(key, proc, metadata)
+          case proc.arity
+          when 0 then proc.call
+          when 2 then proc.call(metadata[key], metadata)
+          else proc.call(metadata[key])
+          end
+        end
+
         def relevant_line_numbers(metadata)
           Metadata.ascend(metadata).map { |meta| meta[:line_number] }
         end