mastodon/spec/models/user_spec.rb

require 'rails_helper'

RSpec.describe User, type: :model do
  let(:account) { Fabricate(:account, username: 'alice') }  
  let(:password) { 'abcd1234' }

  describe 'blacklist' do
    it 'should allow a non-blacklisted user to be created' do
      user = User.new(email: 'foo@example.com', account: account, password: password)

      expect(user.valid?).to be_truthy
    end
    
    it 'should not allow a blacklisted user to be created' do
      user = User.new(email: 'foo@mvrht.com', account: account, password: password)

      expect(user.valid?).to be_falsey
    end
  end

  describe 'whitelist' do
    around(:each) do |example|
      old_whitelist = Rails.configuration.x.email_whitelist

      Rails.configuration.x.email_domains_whitelist = 'mastodon.space'

      example.run

      Rails.configuration.x.email_domains_whitelist = old_whitelist
    end

    it 'should not allow a user to be created unless they are whitelisted' do
      user = User.new(email: 'foo@example.com', account: account, password: password)
      expect(user.valid?).to be_falsey
    end

    it 'should allow a user to be created if they are whitelisted' do
      user = User.new(email: 'foo@mastodon.space', account: account, password: password)
      expect(user.valid?).to be_truthy
    end    
  end
end