public function testSetDefaultParam()
{
$router = new Router();
$return = $router->setDefaultParam('foo', 'bar');
$this->assertSame($router, $return);
$expected = ['foo' => 'bar'];
$reflection = new ReflectionProperty($router, 'defaultParams');
$reflection->setAccessible(true);
$this->assertSame($expected, $reflection->getValue($router));
}