DraftVersion base model and very basic admin pages

spec/features/admin/legislation/draft_versions_spec.rb

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+require 'rails_helper'
+
+feature 'Admin legislation draft versions' do
+
+  background do
+    admin = create(:administrator)
+    login_as(admin.user)
+  end
+
+  context "Feature flag" do
+
+    scenario 'Disabled with a feature flag' do
+      Setting['feature.legislation'] = nil
+      process = create(:legislation_process)
+      expect{ visit admin_legislation_process_draft_versions_path(process) }.to raise_exception(FeatureFlags::FeatureDisabled)
+    end
+
+  end
+
+  context "Index" do
+
+    scenario 'Displaying legislation process draft versions' do
+      process = create(:legislation_process, title: 'An example legislation process')
+      draft_version = create(:legislation_draft_version, process: process, title: 'Version 1')
+
+      visit admin_legislation_processes_path(filter: 'all')
+
+      click_link 'An example legislation process'
+      click_link 'Text'
+      click_link 'Version 1'
+
+      expect(page).to have_content(draft_version.title)
+      expect(page).to have_content(draft_version.changelog)
+    end
+  end
+
+  context 'Create' do
+    scenario 'Valid legislation draft_version' do
+      process = create(:legislation_process, title: 'An example legislation process')
+
+      visit admin_root_path
+
+      within('#side_menu') do
+        click_link "Collaborative Legislation"
+      end
+
+      click_link "All"
+
+      expect(page).to have_content 'An example legislation process'
+
+      click_link 'An example legislation process'
+      click_link 'Text'
+
+      click_link 'Create version'
+
+      fill_in 'legislation_draft_version_title', with: 'Version 3'
+      fill_in 'legislation_draft_version_changelog', with: 'Version 3 changes'
+      fill_in 'legislation_draft_version_body', with: 'Version 3 body'
+
+      click_button 'Create version'
+
+      expect(page).to have_content 'An example legislation process'
+      expect(page).to have_content 'Version 3'
+    end
+  end
+end