Add a failure spec for postgres

Gemfile.lock

@@ -1,28 +1,29 @@
 PATH
   remote: .
   specs:
-    immortal (1.0.3)
+    immortal (1.0.5)
       activerecord (~> 3.1.1)
 
 GEM
   remote: http://rubygems.org/
   specs:
-    activemodel (3.1.1)
-      activesupport (= 3.1.1)
+    activemodel (3.1.3)
+      activesupport (= 3.1.3)
       builder (~> 3.0.0)
       i18n (~> 0.6)
-    activerecord (3.1.1)
-      activemodel (= 3.1.1)
-      activesupport (= 3.1.1)
+    activerecord (3.1.3)
+      activemodel (= 3.1.3)
+      activesupport (= 3.1.3)
       arel (~> 2.2.1)
       tzinfo (~> 0.3.29)
-    activesupport (3.1.1)
+    activesupport (3.1.3)
       multi_json (~> 1.0)
     arel (2.2.1)
     builder (3.0.0)
     diff-lcs (1.1.3)
     i18n (0.6.0)
-    multi_json (1.0.3)
+    multi_json (1.0.4)
+    pg (0.11.0)
     rspec (2.6.0)
       rspec-core (~> 2.6.0)
       rspec-expectations (~> 2.6.0)
@@ -32,12 +33,13 @@ GEM
       diff-lcs (~> 1.1.2)
     rspec-mocks (2.6.0)
     sqlite3 (1.3.4)
-    tzinfo (0.3.30)
+    tzinfo (0.3.31)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   immortal!
+  pg
   rspec (~> 2.6.0)
   sqlite3

immortal.gemspec

@@ -18,5 +18,6 @@ Gem::Specification.new do |s|
   s.add_dependency 'activerecord', '~> 3.1.1'
   s.add_development_dependency 'rspec', '~> 2.6.0'
   s.add_development_dependency 'sqlite3'
+  s.add_development_dependency 'pg'
 
 end