Allow single line methods in our mock model function

Author: JonRowe

lib/rspec/active_model/mocks/mocks.rb

@@ -97,6 +97,7 @@ def mock_model(string_or_model_class, stubs={})
           model_class = Object.const_get(string_or_model_class)
         else
           model_class = Object.const_set(string_or_model_class, Class.new do
+            # rubocop:disable  Style/SingleLineMethods
             extend ::ActiveModel::Naming
             def self.primary_key; :id; end
 
@@ -106,6 +107,7 @@ def self._reflect_on_association(_other); nil; end
             def self.composite_primary_key?; false; end
             def self.has_query_constraints?; false; end
             def self.param_delimiter; "-"; end
+            # rubocop:enable  Style/SingleLineMethods
           end)
         end
       else