AdminNegotiator example

class AdminNegotiatorTest extends UnitTestCase {

  /** * @dataProvider getThemes */
  public function testDetermineActiveTheme($admin_theme, $expected) {
    $user = $this->prophesize(AccountInterface::class);
    $config_factory = $this->getConfigFactoryStub(['system.theme' => ['admin' => $admin_theme]]);
    $entity_type_manager = $this->prophesize(EntityTypeManagerInterface::class);
    $admin_context = $this->prophesize(AdminContext::class);
    $negotiator = new AdminNegotiator($user->reveal(), $config_factory, $entity_type_manager->reveal(), $admin_context->reveal());
    $route_match = $this->prophesize(RouteMatch::class);
    $this->assertSame($expected, $negotiator->determineActiveTheme($route_match->reveal()));
  }

  /** * Provides a list of theme names to test. */
  public function getThemes() {
    return [
      ['claro', 'claro'],
      [NULL, NULL],
      [