```ruby
require 'spec_helper'

module Comptroller
  describe Practice do
    it 'retrieves all pratices' do
      expect(Practice.all.first).to eql(Practice.new(:export_url => 'https://optimis.duxware.com', :token => '12345', :external_id => 3))
    end

    it 'creates new practices' do
      practice = Practice.create(:external_id => 5, :export_url => 'http://hello.world', :token => '12345')
      expect(practice).to eql(Practice.new(:external_id => 5, :export_url => 'http://hello.world', :token => '12345'))
    end

    it 'retrieves practice by id' do
      practice = Practice.find(1)
      expect(practice).to eql(Practice.new(:external_id => 3, :export_url => 'https://optimis.duxware.com', :token => '12345'))
    end

    it 'updates practices' do
      expect(Practice.save_existing(1, :export_url => 'https://optimis.webpt.com')).to be_true
      expect(Practice.find(1).export_url).to eql('https://optimis.webpt.com')
    end

    it 'deletes practices' do
      Practice.destroy_existing(1)
      practice_ids = Practice.all.map(&:id)
      expect(practice_ids.include?(1)).to be_false
    end
  end
end
```

Add context to practice specs
user
```ruby
require 'spec_helper'

module Comptroller
  describe Practice do
    context 'crud api' do
      it 'retrieves all pratices' do
        expect(Practice.all.first).to eql(Practice.new(:export_url => 'https://optimis.duxware.com', :token => '12345', :external_id => 3))
      end

      it 'creates new practices' do
        practice = Practice.create(:external_id => 5, :export_url => 'http://hello.world', :token => '12345')
        expect(practice).to eql(Practice.new(:external_id => 5, :export_url => 'http://hello.world', :token => '12345'))
      end

      it 'retrieves practice by id' do
        practice = Practice.find(1)
        expect(practice).to eql(Practice.new(:external_id => 3, :export_url => 'https://optimis.duxware.com', :token => '12345'))
      end

      it 'updates practices' do
        expect(Practice.save_existing(1, :export_url => 'https://optimis.webpt.com')).to be_true
        expect(Practice.find(1).export_url).to eql('https://optimis.webpt.com')
      end

      it 'deletes practices' do
        Practice.destroy_existing(1)
        practice_ids = Practice.all.map(&:id)
        expect(practice_ids.include?(1)).to be_false
      end
    end
  end
end
```
assistant