Add model test for sponsership_level

spec/models/sponsorship_level_spec.rb

@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe SponsorshipLevel do
-  describe 'validations' do
+  describe 'validation' do
 
     it 'has a valid factory' do
       expect(build(:sponsorship_level)).to be_valid
@@ -11,4 +11,31 @@ describe SponsorshipLevel do
       should validate_presence_of(:title)
     end
   end
+
+  describe 'association' do
+    it { is_expected.to belong_to(:conference) }
+    it { is_expected.to have_many(:sponsors) }
+  end
+
+  describe 'acts_as_list' do
+    let(:conference) { create(:conference) }
+
+    before do
+      @first_sponsorship_level = create(:sponsorship_level, conference: conference)
+      @second_sponsorship_level = create(:sponsorship_level, conference: conference)
+      @second_sponsorship_level.move_higher
+      @third_sponsorship_level = create(:sponsorship_level, conference: conference)
+    end
+
+    it 'is positions sponsorship_levels in order' do
+      expect(SponsorshipLevel.where(conference_id: conference.id).order(:position).map(&:id))
+        .to eq [2, 1, 3]
+    end
+
+    it 'maintains order after deleting one element' do
+      @first_sponsorship_level.destroy
+      expect(SponsorshipLevel.where(conference_id: conference.id).order(:position).map(&:id))
+        .to eq [2, 3]
+    end
+  end
 end