Issue #3304636 by hhvardan: Add tests

# Schema for the configuration files of the Field is Empty module.

field.value.field_is_empty:

  type: field.value.boolean

  label: 'Default value'

field.field_settings.field_is_empty:

  type: field.field_settings.boolean

  label: 'Field is Empty settings'

  mapping:

    field_name:

      type: text

      label: 'Source'

    empty_value:

      type: boolean

      label: 'Empty Value'

<?php

namespace Drupal\Tests\field_is_empty\Kernel;

use Drupal\entity_test\Entity\EntityTest;

use Drupal\field\Entity\FieldConfig;

use Drupal\field\Entity\FieldStorageConfig;

use Drupal\field_is_empty\Plugin\Field\FieldType\FieldIsEmptyItem;

use Drupal\Tests\field\Kernel\FieldKernelTestBase;

use Drupal\Tests\field_is_empty\Traits\FieldIsEmptyFieldCreationTrait;

/**

 * Tests for the Field Is Empty module.

 *

 * @group field_is_empty

 */

class FieldIsEmptyFieldTest extends FieldKernelTestBase {

  use FieldIsEmptyFieldCreationTrait;

  /**

   * Modules to install.

   *

   * @var array

   */

  protected static $modules = ['field_is_empty'];

  /**

   * {@inheritdoc}

   */

  protected function setUp(): void {

    parent::setUp();

    $field_storage = FieldStorageConfig::create([

      'type' => 'string',

      'entity_type' => 'entity_test',

      'field_name' => 'field_body',

    ]);

    $field_storage->save();

    FieldConfig::create([

      'field_storage' => $field_storage,

      'bundle' => 'entity_test',

    ])->save();

    $field_settings = [

      FieldIsEmptyItem::FIELD_NAME_SETTING => 'field_body',

      FieldIsEmptyItem::VALUE_ON_EMPTY_SETTING => TRUE,

      'on_label' => 'Yes',

      'off_label' => 'No'

    ];

    $this->createFieldIsEmptyField('field_is_body_empty', $field_settings);

  }

  /**

   * Tests field output

   */

  public function testFieldIsEmptyOutput() {

    // Create a test entity

    $entity = EntityTest::create();

    $entity->name->value = $this->randomMachineName();

    $entity->save();

    $entity = EntityTest::load($entity->id());

    $this->assertEquals($entity->field_is_body_empty->value, 1);

    // Add data to field_body field

    $entity->field_body->value = $this->randomMachineName(32);

    $entity->save();

    $entity = EntityTest::load($entity->id());

    $this->assertEquals($entity->field_is_body_empty->value, 0);

  }

}

<?php

namespace Drupal\Tests\field_is_empty\Traits;

use Drupal\field\Entity\FieldConfig;

use Drupal\field\Entity\FieldStorageConfig;

/**

 * Provides a helper method for creating Field is Empty fields.

 */

trait FieldIsEmptyFieldCreationTrait {

  /**

   * Create a new Field is empty field.

   *

   * @param string $name

   *   The name of the new field (all lowercase)

   * @param array $field_settings

   *   (optional) A list of instance settings that will be added to the instance

   *   defaults.

   */

  protected function createFieldIsEmptyField($name, $field_settings = []) {

    FieldStorageConfig::create([

      'field_name' => $name,

      'entity_type' => 'entity_test',

      'type' => 'field_is_empty',

    ])->save();

    $field_config = FieldConfig::create([

      'field_name' => $name,

      'label' => $name,

      'entity_type' => 'entity_test',

      'bundle' => 'entity_test',

      'settings' => $field_settings,

    ]);

    $field_config->save();

    return $field_config;

  }

}