DependencyMissingTest.php

<?php

namespace Drupal\Tests\system\Functional\UpdateSystem;

use Drupal\Tests\BrowserTestBase;

/**
 * Tests that missing update dependencies are correctly flagged.
 *
 * @group Update
 */
class DependencyMissingTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'update_test_0',
        'update_test_2',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    protected function setUp() {
        // Only install update_test_2.module, even though its updates have a
        // dependency on update_test_3.module.
        parent::setUp();
        require_once $this->root . '/core/includes/update.inc';
    }
    public function testMissingUpdate() {
        $starting_updates = [
            'update_test_2' => 8001,
        ];
        $update_graph = update_resolve_dependencies($starting_updates);
        $this->assertTrue($update_graph['update_test_2_update_8001']['allowed'], "The module's first update function is allowed to run, since it does not have any missing dependencies.");
        $this->assertFalse($update_graph['update_test_2_update_8002']['allowed'], "The module's second update function is not allowed to run, since it has a direct dependency on a missing update.");
        $this->assertFalse($update_graph['update_test_2_update_8003']['allowed'], "The module's third update function is not allowed to run, since it has an indirect dependency on a missing update.");
    }

}