Added CheckboxSelectMultiple Widget

Author: srtab

src/Widgets/CheckboxSelectMultiple.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * Abstract class for Widgets
+ */
+namespace PHPForm\Widgets;
+
+use PHPForm\Widgets\Input;
+
+class CheckboxSelectMultiple extends ChoiceWidget
+{
+    const TEMPLATE = '<div>{options}</div>';
+    const TEMPLATE_CHOICE = '<label for="{for}">' . Input::TEMPLATE . ' {label}</label>';
+
+    protected $allow_multiple_selected = true;
+    protected $option_inherits_attrs = true;
+    protected $selected_attribute = "checked";
+    protected $input_type = "checkbox";
+}

tests/unit/Widgets/CheckboxSelectMultipleTest.php

@@ -0,0 +1,44 @@
+<?php
+namespace PHPForm\Unit\Widgets;
+
+use PHPUnit\Framework\TestCase;
+
+use PHPForm\Widgets\CheckboxSelectMultiple;
+
+class CheckboxSelectMultipleTest extends TestCase
+{
+    public function setUp()
+    {
+        $this->widget = new CheckboxSelectMultiple(["option1" => "option1", "option2" => "option2"]);
+    }
+
+    public function testRender()
+    {
+        $expected =
+            '<div>' .
+                '<label for="id_name_1">' .
+                    '<input id="id_name_1" name="name" type="checkbox" value="option1"/> option1' .
+                '</label>' .
+                '<label for="id_name_2">' .
+                    '<input id="id_name_2" name="name" type="checkbox" value="option2"/> option2'.
+                '</label>' .
+            '</div>';
+
+        $this->assertXmlStringEqualsXmlString($expected, $this->widget->render("name", null));
+    }
+
+    public function testRenderChecked()
+    {
+        $expected =
+            '<div>' .
+                '<label for="id_name_1">' .
+                    '<input id="id_name_1" name="name" type="checkbox" checked="checked" value="option1"/> option1' .
+                '</label>' .
+                '<label for="id_name_2">' .
+                    '<input id="id_name_2" name="name" type="checkbox" checked="checked" value="option2"/> option2'.
+                '</label>' .
+            '</div>';
+
+        $this->assertXmlStringEqualsXmlString($expected, $this->widget->render("name", ["option1", "option2"]));
+    }
+}