Add price expiration

#522

spec/models/billing/price_spec.rb

@@ -3,6 +3,7 @@ require 'rails_helper'
 RSpec.describe Billing::Price do
   it { is_expected.to monetize(:price) }
   it { is_expected.to be_versioned }
+  it { is_expected.to alias_attribute(:expire_time, :valid_to) }
 
   it 'should have one version' do
     with_versioning do

spec/models/concerns/billing/price/expirable_spec.rb

@@ -0,0 +1,69 @@
+require 'rails_helper'
+
+RSpec.describe Billing::Price do
+  describe '::unexpired' do
+    before :example do
+      travel_to Time.zone.parse('05.07.2010 00:00')
+
+      create(:price, id: 1, expire_time: Time.zone.parse('04.07.2010 23:59'))
+      create(:price, id: 2, expire_time: Time.zone.parse('05.07.2010 00:00'))
+      create(:price, id: 3, expire_time: Time.zone.parse('05.07.2010 00:01'))
+    end
+
+    it 'returns prices with expire time in the future ' do
+      expect(described_class.unexpired.ids).to eq([2, 3])
+    end
+  end
+
+  describe '::expired' do
+    before :example do
+      travel_to Time.zone.parse('05.07.2010 00:00')
+
+      create(:price, id: 1, expire_time: Time.zone.parse('04.07.2010 23:59'))
+      create(:price, id: 2, expire_time: Time.zone.parse('05.07.2010 00:00'))
+      create(:price, id: 3, expire_time: Time.zone.parse('05.07.2010 00:01'))
+    end
+
+    it 'returns prices with expire time in the past ' do
+      expect(described_class.expired.ids).to eq([1])
+    end
+  end
+
+  describe '#expire', db: false do
+    let(:price) { described_class.new(expire_time: Time.zone.parse('06.07.2010')) }
+
+    before :example do
+      travel_to Time.zone.parse('05.07.2010 00:00')
+    end
+
+    it 'expires price' do
+      expect { price.expire }.to change { price.expired? }.from(false).to(true)
+    end
+  end
+
+  describe '#expired?', db: false do
+    subject(:expired) { domain.expired? }
+
+    before :example do
+      travel_to Time.zone.parse('05.07.2010 00:00')
+    end
+
+    context 'when expire time is in the past' do
+      let(:domain) { described_class.new(expire_time: Time.zone.parse('04.07.2010 23:59')) }
+
+      specify { expect(expired).to be true }
+    end
+
+    context 'when expire time is now' do
+      let(:domain) { described_class.new(expire_time: Time.zone.parse('05.07.2010 00:00')) }
+
+      specify { expect(expired).to be false }
+    end
+
+    context 'when expire time is in the future' do
+      let(:domain) { described_class.new(expire_time: Time.zone.parse('05.07.2010 00:01')) }
+
+      specify { expect(expired).to be false }
+    end
+  end
+end