 pointer to a newly created test unit. The second optional parameter -
    expected_failures  - defines the number of test assertions that are expected to fail within the test unit. By
    default no errors are  expected.
   </p>
<div class="caution"><table border="0" summary="Caution">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../../../../../../../doc/html/images/caution.png"></td>
<th align="left">Caution</th>
</tr>
<tr><td align="left" valign="top"><p>
     Be 