Add Typecast::String.to_date specs

spec/unit/virtus/typecast/string/class_methods/to_date_spec.rb

@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+describe Virtus::Typecast::String, '.to_date' do
+  subject { described_class.to_date(string) }
+
+  context 'with a valid date string' do
+    let(:string) { "July, 22th, 2011" }
+
+    it { should be_instance_of(Date) }
+
+    its(:year)  { should == 2011 }
+    its(:month) { should == 7    }
+    its(:day)   { should == 22   }
+  end
+
+  context 'with an invalid date string' do
+    let(:string) { 'non-date' }
+    it { should == string }
+  end
+end