ruby on rails - How to generate RSpec test cases for each value of ActiveModel's Inclusion validator -

i've got simple activemodel class holding string field on defined inclusion validator:

$ rails generate model person name:string gender:string 

class person < activerecord::base   validates :name, presence: true   validates :gender, inclusion: { in: %w(male female unknown) } end 

now i'm writing rspec test cases, should represent up-to-date docu of model.

describe person, type: :model   context 'attributes'     context 'gender'       'allows "male"' { ... }       'allows "female"' { ... }       'allows "unknown"' { ... }     end   end end 

how can automatically generate these 3 test cases list given validator?
know can validator person.validators_on(:gender).first, not how query validator instance enumerable of in-option.

the ultimate goal replace 3 test cases like

query_validator_for_in_enum().each |valid_gender|   "allows '#{valid_gender}'" { ... } end 

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rationale: don't want create separate table 'gender' workaround problem.

i think might want check out shoulda-matchers gem.

adding kind of checks easy as:

it { is_expected.to validate_presence_of(:name) } { is_expected.to validate_inclusion_of(:gender).in_array(%w(male female unknown)) } 

i create constant in model:

genders = %w(male female unknown) 

and use in specs:

it { is_expected.to validate_inclusion_of(:gender).in_array(person::genders) }