Add basic checkbox test

[MAILPOET-265]

tests/unit/Form/Block/CheckboxTest.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace MailPoet\Test\Form\Block;
+
+use MailPoet\Form\Block\Base;
+use MailPoet\Form\Block\Checkbox;
+use MailPoet\Test\Form\HtmlParser;
+use MailPoet\WP\Functions as WPFunctions;
+use PHPUnit\Framework\MockObject\MockObject;
+
+require_once __DIR__ . '/../HtmlParser.php';
+
+class CheckboxTest extends \MailPoetUnitTest {
+  /** @var Checkbox */
+  private $checkbox;
+
+  /** @var MockObject|WPFunctions */
+  private $wpMock;
+
+  /** @var MockObject|Base */
+  private $baseMock;
+
+  /** @var HtmlParser */
+  private $htmlParser;
+
+  private $block = [
+    'type' => 'checkbox',
+    'name' => 'Custom checkbox',
+    'id' => '1',
+    'unique' => '1',
+    'static' => '0',
+    'params' => [
+      'label' => 'Input label',
+      'required' => '',
+      'hide_label' => '',
+      'values' => [[
+        'value' => 'Checkbox label',
+        'is_checked' => '1',
+      ]],
+    ],
+    'position' => '1',
+  ];
+
+  public function _before() {
+    parent::_before();
+    $this->wpMock = $this->createMock(WPFunctions::class);
+    $this->wpMock->method('escAttr')->will($this->returnArgument(0));
+    $this->baseMock = $this->createMock(Base::class);
+    $this->checkbox = new Checkbox($this->baseMock, $this->wpMock);
+    $this->htmlParser = new HtmlParser();
+  }
+
+  public function testItShouldRenderCheckbox() {
+    $this->baseMock->expects($this->once())->method('renderLabel')->willReturn('<label></label>');
+    $this->baseMock->expects($this->once())->method('getFieldName')->willReturn('Field name');
+    $this->baseMock->expects($this->once())->method('getInputValidation')->willReturn('validation="1"');
+    $this->baseMock->expects($this->once())->method('getFieldValue')->willReturn('1');
+    $html = $this->checkbox->render($this->block);
+    $checkboxLabel = $this->htmlParser->getElementByXpath($html, "//label[@class='mailpoet_checkbox_label']");
+    expect($checkboxLabel->nodeValue)->equals(' Checkbox label');
+    $checkbox = $this->htmlParser->getChildElement($checkboxLabel, 'input');
+    $checked = $this->htmlParser->getAttribute($checkbox, 'checked');
+    expect($checked->value)->equals('checked');
+  }
+}