title: How to assert the value of an input element with assert_select
body: <p>Given this HTML in the view:</p>
  
  <pre><code>&lt;form id="new_merchant_user" method="post"&gt;
    &lt;fieldset&gt;
      &lt;div id='legend'&gt;
         &lt;legend&gt;Recover Pasword&lt;/legend&gt;
       &lt;/div&gt;
       &lt;input id="merchant_user_email" name="merchant_user[email]" type="text" value="" /&gt;
       &lt;input class="btn btn-success" name="commit" type="submit" value="Send Reset Instructions" /&gt;
  
     &lt;/fieldset&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>How do I select the value of the button with assert_select?
  I try </p>
  
  <pre><code>assert_select 'form input[type=submit]', "Send Reset Instructions"
  </code></pre>
  
  <p>but its failing with </p>
  
  <pre><code>&lt;Send Reset Instructions&gt; expected but was
  &lt;&gt;..
  Expected 0 to be &gt;= 1.
  </code></pre>
  
  <p>Basically, selecting nothing.</p>
  
  <p>What am I doing wrong here? </p>