title: undefined method `valid?' for #<Class:0x94b626c>
body: <p>Why am  getting this error? How to fix?</p>
  
  <pre><code>  1) User should exist
       Failure/Error: User.should be_valid
       NoMethodError:
         undefined method `valid?' for #&lt;Class:0x94b626c&gt;
  </code></pre>
  
  <p>Test is:</p>
  
  <pre><code>require 'spec_helper'
  
  describe User do
    it "should exist" do
      User.should be_valid
    end 
    it "should not allow me to create a new user without required fields" do
      User.new(:email =&gt; 'bob').should_not be_valid
    end 
  
  end
  </code></pre>
  
  <p>The second test works ok, how can I get the first one to pass? I just want it to check that the model exists</p>