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

_test/tests/inc/form/checkableelement.test.php

+<?php
+
+use dokuwiki\Form;
+
+class form_checkableelement_test extends DokuWikiTest {
+
+    function test_defaults() {
+        $form = new Form\Form();
+        $form->addRadioButton('foo', 'label text first')->val('first')->attr('checked', 'checked');
+        $form->addRadioButton('foo', 'label text second')->val('second');
+
+        $html = $form->toHTML();
+        $pq = phpQuery::newDocumentXHTML($html);
+
+        $input = $pq->find('input[name=foo]');
+        $this->assertTrue($input->length == 2);
+
+        $label = $pq->find('label');
+        $this->assertTrue($label->length == 2);
+
+        $inputs = $pq->find('input[name=foo]');
+        $this->assertEquals('first', pq($inputs->elements[0])->val());
+        $this->assertEquals('second', pq($inputs->elements[1])->val());
+        $this->assertEquals('checked', pq($inputs->elements[0])->attr('checked'));
+        $this->assertEquals('', pq($inputs->elements[1])->attr('checked'));
+    }
+
+    /**
+     * check that posted values overwrite preset default
+     */
+    function test_prefill() {
+        global $INPUT;
+        $INPUT->post->set('foo', 'second');
+
+
+        $form = new Form\Form();
+        $form->addRadioButton('foo', 'label text first')->val('first')->attr('checked', 'checked');
+        $form->addRadioButton('foo', 'label text second')->val('second');
+
+        $html = $form->toHTML();
+        $pq = phpQuery::newDocumentXHTML($html);
+
+        $inputs = $pq->find('input[name=foo]');
+        $this->assertEquals('first', pq($inputs->elements[0])->val());
+        $this->assertEquals('second', pq($inputs->elements[1])->val());
+        $this->assertEquals('', pq($inputs->elements[0])->attr('checked'));
+        $this->assertEquals('checked', pq($inputs->elements[1])->attr('checked'));
+    }
+}

_test/tests/inc/form/form.test.php

+<?php
+
+use dokuwiki\Form;
+
+class form_form_test extends DokuWikiTest {
+
+    /**
+     * checks that an empty form is initialized correctly
+     */
+    function test_defaults() {
+        global $INPUT;
+        global $ID;
+        $ID = 'some:test';
+        $INPUT->get->set('id', $ID);
+        $INPUT->get->set('foo', 'bar');
+
+        $form = new Form\Form();
+        $html = $form->toHTML();
+        $pq = phpQuery::newDocumentXHTML($html);
+
+        $this->assertTrue($pq->find('form')->hasClass('doku_form'));
+        $this->assertEquals(wl($ID, array('foo' => 'bar'), false, '&'), $pq->find('form')->attr('action'));
+        $this->assertEquals('post', $pq->find('form')->attr('method'));
+
+        $this->assertTrue($pq->find('input[name=sectok]')->length == 1);
+    }
+
+}

_test/tests/inc/form/inputelement.test.php

+<?php
+
+use dokuwiki\Form;
+
+class form_inputelement_test extends DokuWikiTest {
+
+    function test_defaults() {
+        $form = new Form\Form();
+        $form->addTextInput('foo', 'label text')->val('this is text');
+
+        $html = $form->toHTML();
+        $pq = phpQuery::newDocumentXHTML($html);
+
+        $input = $pq->find('input[name=foo]');
+        $this->assertTrue($input->length == 1);
+        $this->assertEquals('this is text', $input->val());
+
+        $label = $pq->find('label');
+        $this->assertTrue($label->length == 1);
+        $this->assertEquals('label text', $label->find('span')->text());
+    }
+
+    /**
+     * check that posted values overwrite preset default
+     */
+    function test_prefill() {
+        global $INPUT;
+        $INPUT->post->set('foo', 'a new text');
+
+        $form = new Form\Form();
+        $form->addTextInput('foo', 'label text')->val('this is text');
+
+        $html = $form->toHTML();
+        $pq = phpQuery::newDocumentXHTML($html);
+
+        $input = $pq->find('input[name=foo]');
+        $this->assertTrue($input->length == 1);
+        $this->assertEquals('a new text', $input->val());
+    }
+
+}

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;
     }

inc/Form/Form.php

@@ -34,7 +34,7 @@ class Form extends Element {
         if(!$this->attr('action')) {
             $get = $_GET;
             if(isset($get['id'])) unset($get['id']);
-            $self = wl($ID, $get);
+            $self = wl($ID, $get, false, '&'); //attributes are escaped later
             $this->attr('action', $self);
         }
 
@@ -51,8 +51,8 @@ class Form extends Element {
         // add the security token by default
         $this->setHiddenField('sectok', getSecurityToken());
 
-        // identify this as a form2 based form in HTML
-        $this->addClass('doku_form2');
+        // identify this as a new form based form in HTML
+        $this->addClass('doku_form');
     }
 
     /**

inc/Form/InputElement.php

@@ -28,6 +28,7 @@ class InputElement extends Element {
     public function __construct($type, $name, $label) {
         parent::__construct($type, array('name' => $name));
         $this->attr('name', $name);
+        $this->label = new Label($label);
     }
 
     /**