```ruby
require 'spec_helper'

RSpec.describe CreatesApplicationFromDraft do
  let(:application_draft) { build_stubbed :application_draft }

  subject { described_class.new application_draft }

  describe 'its constructor' do
    it 'sets the application draft' do
      subject = described_class.new application_draft
      expect(subject.application_draft).to eql application_draft
    end
  end

  describe '#save' do
    let(:application_draft) { create :application_draft, :appliable }
    let(:team)              { create :team, :applying_team }

    context 'with a draft that is not ready yet' do
      let(:application_draft) { ApplicationDraft.new }

      it 'will not create an application' do
        expect { subject.save }.not_to change { ApplicationDraft.count }
      end

      it 'returns nil' do
        expect(subject.save).to be_nil
      end
    end

    context 'carrying over the user attributes' do
      skip
    end

    it 'marks the draft as applied' do
      skip
    end

    it 'pings the mentors' do
      skip
    end

  end
end
```

Check for database foreign keys
user
```ruby
require 'spec_helper'

RSpec.describe CreatesApplicationFromDraft do
  let(:application_draft) { build_stubbed :application_draft }

  subject { described_class.new application_draft }

  describe 'its constructor' do
    it 'sets the application draft' do
      subject = described_class.new application_draft
      expect(subject.application_draft).to eql application_draft
    end
  end

  describe '#save' do
    let(:application_draft) { create :application_draft, :appliable }
    let(:team)              { create :team, :applying_team }

    context 'with a draft that is not ready yet' do
      let(:application_draft) { ApplicationDraft.new }

      it 'will not create an application' do
        expect { subject.save }.not_to change { ApplicationDraft.count }
      end

      it 'returns nil' do
        expect(subject.save).to be_nil
      end
    end

    context 'carrying over the user attributes' do
      skip
    end

    it 'marks the draft as applied' do
      skip
    end

    it 'pings the mentors' do
      skip
    end

    it 'sets the saison' do
      skip
    end

    it 'adds a database reference to itself' do
      skip
    end

  end
end
```
assistant