Set default date at run time

Fixes #11

lib/quote.rb

@@ -8,7 +8,7 @@ class Quote
 
   values do
     attribute :base, String, default: DEFAULT_BASE
-    attribute :date, Date, default: Currency.current_date
+    attribute :date, Date, default: proc { Currency.current_date }
   end
 
   def rates

spec/edge_cases_spec.rb

@@ -6,6 +6,7 @@ describe 'the API' do
   include Rack::Test::Methods
 
   let(:app)  { Sinatra::Application }
+  let(:json) { Yajl::Parser.new.parse last_response.body }
 
   it 'handles unfound pages' do
     get '/foo'
@@ -31,4 +32,14 @@ describe 'the API' do
     get '/latest?base=USD?callback=?'
     last_response.must_be :unprocessable?
   end
+
+  it 'returns fresh dates' do
+    Currency.db.transaction do
+      new_date = Currency.current_date + 1
+      Currency.create(date: new_date, iso_code: 'FOO', rate: 1)
+      get '/latest'
+      json['date'].must_equal new_date.to_s
+      raise Sequel::Rollback
+    end
+  end
 end