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@@ -1,4 +1,7 @@
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 class Address < ActiveRecord::Base
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   belongs_to :addressable, :polymorphic => true
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   validates_uniqueness_of :title, :scope => [:addressable_type, :addressable_id]
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+  
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+  validates_length_of :zip, :minimum => 5
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+  validates_numericality_of :zip  
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 end

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@@ -4,4 +4,8 @@ class AddressTest < Test::Unit::TestCase
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   load_all_fixtures
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   should_belong_to :addressable
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   should_require_unique_attributes :title, :scoped_to => [:addressable_id, :addressable_type]
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+  
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+  
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+  should_ensure_length_at_least :zip, 5
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+  should_only_allow_numeric_values_for :zip  
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 end