MultipleBlockFormTest.php

<?php

namespace Drupal\KernelTests\Core\Block;

use Drupal\block_test\PluginForm\EmptyBlockForm;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests that blocks can have multiple forms.
 *
 * @group block
 */
class MultipleBlockFormTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    public static $modules = [
        'system',
        'block',
        'block_test',
    ];
    
    /**
     * Tests that blocks can have multiple forms.
     */
    public function testMultipleForms() {
        $configuration = [
            'label' => 'A very cool block',
        ];
        $block = \Drupal::service('plugin.manager.block')->createInstance('test_multiple_forms_block', $configuration);
        $form_object1 = \Drupal::service('plugin_form.factory')->createInstance($block, 'configure');
        $form_object2 = \Drupal::service('plugin_form.factory')->createInstance($block, 'secondary');
        // Assert that the block itself is used for the default form.
        $this->assertSame($block, $form_object1);
        // Ensure that EmptyBlockForm is used and the plugin is set.
        $this->assertInstanceOf(EmptyBlockForm::class, $form_object2);
        $this->assertAttributeEquals($block, 'plugin', $form_object2);
    }

}