Refactoring Tickets

- Tickets now independent from registration
- Implemented money gem
#419

spec/models/ticket_spec.rb

@@ -0,0 +1,92 @@
+require 'spec_helper'
+
+describe Ticket do
+  let(:conference) { create(:conference) }
+  let(:ticket) { create(:ticket, price: 50, conference: conference) }
+  let(:user) { create(:user) }
+
+  describe 'validations' do
+    it 'has a valid factory' do
+      expect(build(:ticket)).to be_valid
+    end
+
+    it 'is not valid without a title' do
+      should validate_presence_of(:title)
+    end
+
+    it 'is not valid without a price_cents' do
+      should validate_presence_of(:price_cents)
+    end
+
+    it 'is not valid without a price_currency' do
+      should validate_presence_of(:price_currency)
+    end
+
+    it 'is not valid with a price_cents equals zero' do
+      should_not allow_value(0).for(:price_cents)
+    end
+
+    it 'is not valid with a price_cents smaller than zero' do
+      should_not allow_value(-1).for(:price_cents)
+    end
+
+    it 'is valid with a price_cents greater than zero' do
+      should allow_value(1).for(:price_cents)
+    end
+  end
+
+  describe '#bought?' do
+    it 'returns true if the user has bought this ticket' do
+      create(:ticket_purchase,
+             user: user,
+             ticket: ticket)
+      expect(ticket.bought?(user)).to eq(true)
+    end
+
+    it 'returns true if the user has bought this ticket' do
+      expect(ticket.bought?(user)).to eq(false)
+    end
+  end
+
+  describe '#quantity_bought_by' do
+    it 'returns the correct value if the user has bought this ticket' do
+      create(:ticket_purchase,
+             user: user,
+             ticket: ticket,
+             quantity: 20)
+      expect(ticket.quantity_bought_by(user)).to eq(20)
+    end
+
+    it 'returns zero if the user has not bought this ticket' do
+      expect(ticket.quantity_bought_by(user)).to eq(0)
+    end
+  end
+
+  describe '#total_price' do
+    it 'returns the correct value if the user has bought this ticket' do
+      create(:ticket_purchase,
+             user: user,
+             ticket: ticket,
+             quantity: 20)
+      expect(ticket.total_price(user)).to eq(20 * 50)
+    end
+
+    it 'returns zero if the user has not bought this ticket' do
+      expect(ticket.total_price(user)).to eq(0)
+    end
+  end
+
+  describe 'self#total_price' do
+    it 'returns the correct value if the user has bought this ticket' do
+      create(:ticket_purchase,
+             user: user,
+             ticket: ticket,
+             quantity: 20)
+      expect(Ticket.total_price(conference, user)).to eq(20 * 50)
+    end
+
+    it 'returns zero if the user has not bought this ticket' do
+      expect(Ticket.total_price(conference, user)).to eq(0)
+    end
+  end
+end