Also test form element decorators

tests/FormElementDecoratorTest.php

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+<?php
+
+namespace ipl\Tests\Html;
+
+use ipl\Html\Form;
+use ipl\Tests\Html\TestDummy\PositionedFormElementDecorator;
+use ipl\Tests\Html\TestDummy\SimpleFormElementDecorator;
+use ipl\Tests\Html\TestDummy\WithinContainerFormElementDecorator;
+
+class FormElementDecoratorTest extends TestCase
+{
+    public function testPositionedFormElementDecorator()
+    {
+        $form = (new Form())
+            ->setDefaultElementDecorator(new PositionedFormElementDecorator())
+            ->addElement('text', 'decorated-form-element');
+
+        $html = <<<'HTML'
+<form method="POST">
+  <div class="positioned-decorator">
+    <input type="text" name="decorated-form-element">
+  </div>
+</form>
+HTML;
+
+        $this->assertHtml($html, $form);
+    }
+
+    public function testSimpleFormElementDecorator()
+    {
+        $form = (new Form())
+            ->setDefaultElementDecorator(new SimpleFormElementDecorator())
+            ->addElement('text', 'decorated-form-element');
+
+        $html = <<<'HTML'
+<form method="POST">
+  <div class="simple-decorator">
+    <input type="text" name="decorated-form-element">
+  </div>
+</form>
+HTML;
+
+        $this->assertHtml($html, $form);
+    }
+
+    public function testWithinContainerFormElementDecorator()
+    {
+        $form = (new Form())
+            ->setDefaultElementDecorator(new WithinContainerFormElementDecorator())
+            ->addElement('text', 'decorated-form-element');
+
+        $html = <<<'HTML'
+<form method="POST">
+  <div class="within-container-decorator">
+    <div class="container">
+      <input type="text" name="decorated-form-element">
+    </div>
+  </div>
+</form>
+HTML;
+
+        $this->assertHtml($html, $form);
+    }
+}

tests/TestDummy/PositionedFormElementDecorator.php

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+<?php
+
+namespace ipl\Tests\Html\TestDummy;
+
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\Contract\FormElement;
+use ipl\Html\Contract\FormElementDecorator;
+
+class PositionedFormElementDecorator extends BaseHtmlElement implements FormElementDecorator
+{
+    protected $tag = 'div';
+
+    protected $defaultAttributes = ['class' => 'positioned-decorator'];
+
+    /** @var FormElement */
+    protected $formElement;
+
+    public function decorate(FormElement $formElement)
+    {
+        $decorator = new static();
+        $decorator->formElement = $formElement;
+
+        $formElement->prependWrapper($decorator);
+
+        return $decorator;
+    }
+
+    protected function assemble()
+    {
+        $this->add($this->formElement);
+    }
+}

tests/TestDummy/SimpleFormElementDecorator.php

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+<?php
+
+namespace ipl\Tests\Html\TestDummy;
+
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\Contract\FormElement;
+use ipl\Html\Contract\FormElementDecorator;
+
+class SimpleFormElementDecorator extends BaseHtmlElement implements FormElementDecorator
+{
+    protected $tag = 'div';
+
+    protected $defaultAttributes = ['class' => 'simple-decorator'];
+
+    /** @var FormElement */
+    protected $formElement;
+
+    public function decorate(FormElement $formElement)
+    {
+        $decorator = new static();
+        $decorator->formElement = $formElement;
+
+        $formElement->prependWrapper($decorator);
+
+        return $decorator;
+    }
+}

tests/TestDummy/WithinContainerFormElementDecorator.php

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+<?php
+
+namespace ipl\Tests\Html\TestDummy;
+
+use ipl\Html\BaseHtmlElement;
+use ipl\Html\Contract\FormElement;
+use ipl\Html\Contract\FormElementDecorator;
+use ipl\Html\Html;
+
+class WithinContainerFormElementDecorator extends BaseHtmlElement implements FormElementDecorator
+{
+    protected $tag = 'div';
+
+    protected $defaultAttributes = ['class' => 'within-container-decorator'];
+
+    /** @var FormElement */
+    protected $formElement;
+
+    public function decorate(FormElement $formElement)
+    {
+        $decorator = new static();
+        $decorator->formElement = $formElement;
+
+        $formElement->prependWrapper($decorator);
+
+        return $decorator;
+    }
+
+    protected function assemble()
+    {
+        $this->add(Html::tag('div', ['class' => 'container'], $this->formElement));
+    }
+}