FactoryGirl Association

gistfile1.rb

# models/user.rb
class User < ActiveRecord::Base
  has_many :user_brands
end

# models/user_brand.rb
class UserBrand < ActiveRecord::Base
	belongs_to :user
end

# spec/factories/users.rb
FactoryGirl.define do 
  factory :user do 
    full_name "Joe Blow"
    email "[email protected]"
    password "p@ssw0rd"
    amagi_db_id "6190"
    trait :agency do
      roles [Role.find_by_name("agency")]
    end
  end 
end

# spec/factories/user_brands.rb
FactoryGirl.define do 
  factory :user_brand do 
    trait :agency do
      client_name "Procter And Gamble Home Products Limited"
      client_id "15041"
      brand_name "Pantene Pro V Hair Oil"
    end
    trait :client do
      client_name "Coca-Cola India Private Ltd."
      client_id "15012"
      brand_name "Fanta"
    end
  end 
end

#spec/models/user_spec.rb
require 'rails_helper'
RSpec.describe User, :type => :model do
  it "agency should have atleast one brand" do
    user = create(:user, :agency)
    user_brands = user.user_brands.first
    expect(user_brands).not_to be nil
  end
end