public function test_get_namespaces()
{
$server = new WP_REST_Server();
$server->register_route('test/example', '/test/example/some-route', array(array('methods' => WP_REST_Server::READABLE, 'callback' => '__return_true')));
$server->register_route('test/another', '/test/another/route', array(array('methods' => WP_REST_Server::READABLE, 'callback' => '__return_false')));
$namespaces = $server->get_namespaces();
$this->assertContains('test/example', $namespaces);
$this->assertContains('test/another', $namespaces);
}