class DependencyOrderingTest

class DependencyOrderingTest extends BrowserTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'update_test_0',
        'update_test_1',
        'update_test_2',
        'update_test_3',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        require_once $this->root . '/core/includes/update.inc';
    }
    
    /**
     * Tests that updates within a single module run in the correct order.
     */
    public function testUpdateOrderingSingleModule() : void {
        $starting_updates = [
            'update_test_1' => 8001,
        ];
        $expected_updates = [
            'update_test_1_update_8001',
            'update_test_1_update_8002',
            'update_test_1_update_8003',
        ];
        $actual_updates = array_keys(update_resolve_dependencies($starting_updates));
        $this->assertEquals($expected_updates, $actual_updates, 'Updates within a single module run in the correct order.');
    }
    
    /**
     * Tests that dependencies between modules are resolved correctly.
     */
    public function testUpdateOrderingModuleInterdependency() : void {
        $starting_updates = [
            'update_test_2' => 8001,
            'update_test_3' => 8001,
        ];
        $update_order = array_keys(update_resolve_dependencies($starting_updates));
        // Make sure that each dependency is satisfied.
        $first_dependency_satisfied = array_search('update_test_2_update_8001', $update_order) < array_search('update_test_3_update_8001', $update_order);
        $this->assertTrue($first_dependency_satisfied, 'The dependency of the second module on the first module is respected by the update function order.');
        $second_dependency_satisfied = array_search('update_test_3_update_8001', $update_order) < array_search('update_test_2_update_8002', $update_order);
        $this->assertTrue($second_dependency_satisfied, 'The dependency of the first module on the second module is respected by the update function order.');
    }

}