Refactor unit tests to have one logical assertion per method.

- Support executing a single unit tests using __only prefix
- Hook in Email classes to main code, even if they're unused


git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1373 48356398-32a2-884e-a903-53898d9a118a

tests/HTMLPurifier/ChildDefHarness.php

@@ -7,6 +7,7 @@ class HTMLPurifier_ChildDefHarness extends HTMLPurifier_ComplexHarness
 {
     
     function setUp() {
+        parent::setUp();
         $this->obj       = null;
         $this->func      = 'validateChildren';
         $this->to_tokens = true;