regenerate ruby spec file

modules/swagger-codegen/src/main/resources/ruby/model_test.mustache

@@ -27,7 +27,15 @@ require 'date'
 {{#vars}}
   describe 'test attribute "{{{name}}}"' do
     it 'should work' do
+       {{#isEnum}}
+       validator = Petstore::EnumTest::EnumAttributeValidator.new('{{{datatype}}}', [{{#allowableValues}}{{#values}}"{{{this}}}"{{^-last}}, {{/-last}}{{/values}}{{/allowableValues}}])
+       validator.allowable_values.each do |value|
+         expect { @instance.{{name}} = value }.not_to raise_error
+       end
+       {{/isEnum}}
+       {{^isEnum}}
        # assertion here. ref: https://www.relishapp.com/rspec/rspec-expectations/docs/built-in-matchers
+       {{/isEnum}}
     end
   end