Start implementing checkbox widget.

Basic features and attributes are working, next up is making
checked property smarter.

src/View/Input/Checkbox.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         CakePHP(tm) v3.0
+ * @license       http://www.opensource.org/licenses/mit-license.php MIT License
+ */
+namespace Cake\View\Input;
+
+use Cake\View\StringTemplate;
+
+/**
+ * Input widget for creating checkbox widgets.
+ */
+class Checkbox {
+
+/**
+ * Template instance.
+ *
+ * @var Cake\View\StringTemplate
+ */
+	protected $_templates;
+
+/**
+ * Constructor
+ *
+ * @param Cake\View\StringTemplate $templates
+ */
+	public function __construct($templates) {
+		$this->_templates = $templates;
+	}
+
+/**
+ * Render a checkbox element.
+ *
+ * @param array $data The data to create a checkbox with.
+ */
+	public function render($data) {
+		$data += [
+			'name' => '',
+			'value' => 1,
+			'checked' => false,
+			'disabled' => false,
+		];
+		$attrs = $this->_templates->formatAttributes(
+			$data,
+			['name', 'value']
+		);
+
+		return $this->_templates->format('checkbox', [
+			'name' => $data['name'],
+			'value' => $data['value'],
+			'attrs' => $attrs
+		]);
+	}
+
+}

tests/TestCase/View/Input/CheckboxTest.php

@@ -0,0 +1,117 @@
+<?php
+/**
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         CakePHP(tm) v3.0
+ * @license       http://www.opensource.org/licenses/mit-license.php MIT License
+ */
+namespace Cake\Test\TestCase\View\Input;
+
+use Cake\TestSuite\TestCase;
+use Cake\View\Input\Checkbox;
+use Cake\View\StringTemplate;
+
+/**
+ * Checkbox test case
+ */
+class CheckboxTest extends TestCase {
+
+	public function setUp() {
+		parent::setUp();
+		$templates = [
+			'checkbox' => '<input type="checkbox" name="{{name}}" value="{{value}}"{{attrs}}>',
+		];
+		$this->templates = new StringTemplate();
+		$this->templates->add($templates);
+	}
+
+/**
+ * Test rendering simple checkboxes.
+ *
+ * @return void
+ */
+	public function testRenderSimple() {
+		$checkbox = new Checkbox($this->templates);
+		$data = [
+			'name' => 'Comment[spam]',
+		];
+		$result = $checkbox->render($data);
+		$expected = [
+			'input' => [
+				'type' => 'checkbox',
+				'name' => 'Comment[spam]',
+				'value' => 1,
+			]
+		];
+		$this->assertTags($result, $expected);
+
+		$data = [
+			'name' => 'Comment[spam]',
+			'value' => 99
+		];
+		$result = $checkbox->render($data);
+		$expected = [
+			'input' => [
+				'type' => 'checkbox',
+				'name' => 'Comment[spam]',
+				'value' => 99,
+			]
+		];
+		$this->assertTags($result, $expected);
+	}
+
+/**
+ * Test rendering disabled checkboxes.
+ *
+ * @return void
+ */
+	public function testRenderDisabled() {
+		$checkbox = new Checkbox($this->templates);
+		$data = [
+			'name' => 'Comment[spam]',
+			'disabled' => true,
+		];
+		$result = $checkbox->render($data);
+		$expected = [
+			'input' => [
+				'type' => 'checkbox',
+				'name' => 'Comment[spam]',
+				'value' => 1,
+				'disabled' => 'disabled',
+			]
+		];
+		$this->assertTags($result, $expected);
+	}
+
+/**
+ * Test rendering checked checkboxes.
+ *
+ * @return void
+ */
+	public function testRenderChecked() {
+		$checkbox = new Checkbox($this->templates);
+		$data = [
+			'name' => 'Comment[spam]',
+			'value' => 1,
+			'checked' => 1,
+		];
+		$result = $checkbox->render($data);
+		$expected = [
+			'input' => [
+				'type' => 'checkbox',
+				'name' => 'Comment[spam]',
+				'value' => 1,
+				'checked' => 'checked',
+			]
+		];
+		$this->assertTags($result, $expected);
+	}
+
+}