added a first few tests.

this is far from comprehensible, but should give an idea how the new
library works and how to write tests

1 files changed, 1 insertions, 0 deletions

diff --git a/inc/Form/Element.php b/inc/Form/Element.php
index 6f23e2631..3fd170a80 100644
--- a/inc/Form/Element.php
+++ b/inc/Form/Element.php
@@ -101,6 +101,7 @@ abstract class Element {
         $classes = explode(' ', $this->attr('class'));
         $classes[] = $class;
         $classes = array_unique($classes);
+        $classes = array_filter($classes);
         $this->attr('class', join(' ', $classes));
         return $this;
     }