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/AttrTransform/LengthTest.php

@@ -11,21 +11,32 @@ class HTMLPurifier_AttrTransform_LengthTest extends HTMLPurifier_AttrTransformHa
         $this->obj = new HTMLPurifier_AttrTransform_Length('width');
     }
     
-    function test() {
+    function testEmptyInput() {
         $this->assertResult( array() );
+    }
+    
+    function testTransformPixel() {
         $this->assertResult(
             array('width' => '10'),
             array('style' => 'width:10px;')
         );
+    }
+    
+    function testTransformPercentage() {
         $this->assertResult(
             array('width' => '10%'),
             array('style' => 'width:10%;')
         );
+    }
+    
+    function testPrependNewCSS() {
         $this->assertResult(
             array('width' => '10%', 'style' => 'font-weight:bold'),
             array('style' => 'width:10%;font-weight:bold')
         );
-        // this behavior might change
+    }
+    
+    function testLenientTreatmentOfInvalidInput() {
         $this->assertResult(
             array('width' => 'asdf'),
             array('style' => 'width:asdf;')