```ruby
require 'rails_helper'

RSpec.describe UserDeposit do
  describe '#call' do
    let(:user) {create(:user, balance: 1000)}
    let(:interactor) {UserDeposit.new(user_id: user.id, amount: 1000)}
    let(:context) {interactor.context}

    it 'succeeds' do
      interactor.call
      expect(context).to be_a_success
    end

    it 'updates the user\'s balance' do
      expect {interactor.call && user.reload}.to change(user, :balance).
        from(1000).to(2000)
    end

    it 'creates a transaction' do
      expect {interactor.call}.to change(Transaction, :count).by(1)
    end
  end
end
```

Add a context for user_deposit specs
user
```ruby
require 'rails_helper'

RSpec.describe UserDeposit do
  describe '#call' do
    let(:user) {create(:user, balance: 1000)}
    let(:interactor) {UserDeposit.new(user_id: user.id, amount: 1000)}
    let(:context) {interactor.context}

    context 'when everything is swell' do
    it 'succeeds' do
      interactor.call
      expect(context).to be_a_success
    end

    it 'updates the user\'s balance' do
      expect {interactor.call && user.reload}.to change(user, :balance).
        from(1000).to(2000)
    end

    it 'creates a transaction' do
      expect {interactor.call}.to change(Transaction, :count).by(1)
    end
    end
  end
end
```
assistant