group :test do
  gem 'rspec-rails'
  gem 'factory_bot_rails'
  gem 'faker'
end

rails generate rspec:install

require 'rails_helper'

RSpec.describe User, type: :model do
  describe 'validations' do
    it { is_expected.to validate_presence_of(:email) }
    it { is_expected.to validate_uniqueness_of(:email) }
  end
  
  describe '#full_name' do
    it 'returns concatenated first and last name' do
      user = build(:user, first_name: 'John', last_name: 'Doe')
      expect(user.full_name).to eq('John Doe')
    end
  end
end

rspec                    # All specs
rspec spec/models       # Only model specs
rspec spec/models/user_spec.rb:10  # Specific line