  <option value="%s">Carl Bernstein</option>
  <option value="%s">Joe Better</option>
  <option value="%s">Mike Royko</option>
  </select></p>
  <p><label for="id_age">Age:</label> <input type="number" name="age" id="id_age" min="0" /></p>''' % (w_woodward.pk, w_bernstein.pk, bw.pk, w_royko.pk))
  
          data = {
              'writer': six.text_type(w_woodward.pk),
              'age': '65',
          }
 
</s> remove <option value="%s">Carl Bernstein</option>
<option value="%s">Joe Better</option>
 </s> add  </s> remove <p><label for="id_age">Age:</label> <input type="number" name="age" value="65" id="id_age" min="0" /></p>''' % (w_woodward.pk, w_bernstein.pk, bw.pk, w_royko.pk))
 </s> add <p><label for="id_age">Age:</label> <input type="number" name="age" value="65" id="id_age" min="0" /></p>''' % (self.w_woodward.pk, self.w_royko.pk)) </s> remove <option value="%s">Carl Bernstein</option>
<option value="%s">Joe Better</option>
 </s> add  </s> remove             'writer': six.text_type(w_woodward.pk),
 </s> add             'writer': six.text_type(self.w_woodward.pk), </s> remove </select></li>''' % (w_woodward.pk, w_bernstein.pk, w_royko.pk, c1.pk, c2.pk, c3.pk, c4.pk))
 </s> add </select></li>''' % (self.w_woodward.pk, w_bernstein.pk, self.w_royko.pk, self.c1.pk, self.c2.pk, self.c3.pk, c4.pk))

<p><label for="id_age">Age:</label> <input type="number" name="age" id="id_age" min="0" /></p>''' % (self.w_woodward.pk, self.w_royko.pk))
  <option value="%s">Carl Bernstein</option>
  <option value="%s">Joe Better</option>
  <option value="%s">Mike Royko</option>
  </select></p>
<p><label for="id_age">Age:</label> <input type="number" name="age" id="id_age" min="0" /></p>''' % (self.w_woodward.pk, self.w_royko.pk))
  
          data = {
              'writer': six.text_type(w_woodward.pk),
              'age': '65',
          }
keep keep keep keep replace keep keep keep keep keep
 Fixed #6103 -- Splitted tests in model_forms tests 
tests/model_forms/tests.py