Refactor prices

#475

spec/models/billing/price_spec.rb

@@ -0,0 +1,138 @@
+require 'rails_helper'
+
+RSpec.describe Billing::Price do
+  it { is_expected.to monetize(:price) }
+
+  describe '::operation_categories', db: false do
+    it 'returns available operation categories' do
+      categories = %w[create renew]
+      expect(described_class.operation_categories).to eq(categories)
+    end
+  end
+
+  describe '::durations', db: false do
+    it 'returns available durations' do
+      durations = [
+        '3 months',
+        '6 months',
+        '9 months',
+        '1 year',
+        '2 years',
+        '3 years',
+        '4 years',
+        '5 years',
+        '6 years',
+        '7 years',
+        '8 years',
+        '9 years',
+        '10 years',
+      ]
+
+      expect(described_class.durations).to eq(durations)
+    end
+  end
+
+  describe 'zone validation', db: false do
+    subject(:price) { described_class.new }
+
+    it 'rejects absent' do
+      price.zone = nil
+      price.validate
+      expect(price.errors).to have_key(:zone)
+    end
+  end
+
+  describe 'price validation', db: false do
+    subject(:price) { described_class.new }
+
+    it 'rejects absent' do
+      price.price = nil
+      price.validate
+      expect(price.errors).to have_key(:price)
+    end
+
+    it 'rejects negative' do
+      price.price = -1
+      price.validate
+      expect(price.errors).to have_key(:price)
+    end
+
+    it 'accepts zero' do
+      price.price = 0
+      price.validate
+      expect(price.errors).to_not have_key(:price)
+    end
+
+    it 'accepts greater than zero' do
+      price.price = 1
+      price.validate
+      expect(price.errors).to_not have_key(:price)
+    end
+  end
+
+  describe 'duration validation', db: false do
+    subject(:price) { described_class.new }
+
+    it 'rejects absent' do
+      price.duration = nil
+      price.validate
+      expect(price.errors).to have_key(:duration)
+    end
+
+    it 'rejects invalid' do
+      price.duration = 'invalid'
+      price.validate
+      expect(price.errors).to have_key(:duration)
+    end
+
+    it 'accepts valid' do
+      price.duration = described_class.durations.first
+      price.validate
+      expect(price.errors).to_not have_key(:duration)
+    end
+  end
+
+  describe 'operation category validation', db: false do
+    subject(:price) { described_class.new }
+
+    it 'rejects absent' do
+      price.operation_category = nil
+      price.validate
+      expect(price.errors).to have_key(:operation_category)
+    end
+
+    it 'rejects invalid' do
+      price.operation_category = 'invalid'
+      price.validate
+      expect(price.errors).to have_key(:operation_category)
+    end
+
+    it 'accepts valid' do
+      price.operation_category = described_class.operation_categories.first
+      price.validate
+      expect(price.errors).to_not have_key(:operation_category)
+    end
+  end
+
+  describe '#name', db: false do
+    let(:price) { described_class.new }
+
+    before :example do
+      allow(price).to receive(:operation_category).and_return('category')
+      allow(price).to receive(:zone_name).and_return('zone')
+    end
+
+    it 'returns operation_category and zone name' do
+      expect(price.name).to eq('category zone')
+    end
+  end
+
+  describe '#zone_name', db: false do
+    let(:price) { described_class.new(zone: zone) }
+    let(:zone) { build_stubbed(:zone, origin: 'test') }
+
+    it 'returns zone name' do
+      expect(price.zone_name).to eq('test')
+    end
+  end
+end