index({ ssn: 1 }, { unique: true })

  describe "save" do

    let(:user) do
      Fabricate.build(:admin, ssn: 1)
    end

    let(:user2) do
      Fabricate.build(:admin, ssn: 1, email: 'arthurnn@gmail.com')
    end

    before do
      User.create_indexes
      user.save!
    end

    it do
      expect { user2.with(safe: true).save }.to raise_error(Moped::Errors::OperationFailure)
    end
  end