class BookInstallTest

class BookInstallTest extends KernelTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'node',
    'system',
  ];
  
  /**
   * Tests Book install with pre-existing content type.
   *
   * Tests that Book module can be installed if content type with machine name
   * 'book' already exists.
   */
  public function testBookInstallWithPreexistingContentType() {
    // Create a 'book' content type.
    NodeType::create([
      'type' => 'book',
    ])->save();
    // Install the Book module. Using the module installer service ensures that
    // all the install rituals, including default and optional configuration
    // import, are performed.
    $status = $this->container
      ->get('module_installer')
      ->install([
      'book',
    ]);
    $this->assertTrue($status, 'Book module installed successfully');
  }

}