EntityReferenceFieldCreationTest.php

<?php

namespace Drupal\Tests\system\Functional\Entity;

use Drupal\Tests\BrowserTestBase;
use Drupal\Tests\field\Traits\EntityReferenceTestTrait;

/**
 * Tests creating entity reference fields in the UI.
 *
 * @group entity
 */
class EntityReferenceFieldCreationTest extends BrowserTestBase {
    use EntityReferenceTestTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'entity_test',
        'node',
        'field_ui',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests that entity reference fields cannot target entity types without IDs.
     */
    public function testAddReferenceFieldTargetingEntityTypeWithoutId() {
        $this->drupalLogin($this->rootUser);
        $node_type = $this->drupalCreateContentType()
            ->id();
        // Entity types without an ID key should not be presented as options when
        // creating an entity reference field in the UI.
        $this->drupalGet("/admin/structure/types/manage/{$node_type}/fields/add-field");
        $edit = [
            'new_storage_type' => 'entity_reference',
            'label' => 'Test Field',
            'field_name' => 'test_reference_field',
        ];
        $this->submitForm($edit, 'Save and continue');
        $this->assertSession()
            ->optionNotExists('settings[target_type]', 'entity_test_no_id');
        // Trying to do it programmatically should raise an exception.
        $this->expectException('\\Drupal\\Core\\Field\\FieldException');
        $this->expectExceptionMessage('Entity type "entity_test_no_id" has no ID key and cannot be targeted by entity reference field "test_reference_field"');
        $this->createEntityReferenceField('node', $node_type, 'test_reference_field', 'Test Field', 'entity_test_no_id');
    }

}