public void SerializeAstronaut()
{
var astronaut = new Astronaut
{
Guid = Guid.NewGuid(),
Position = new Vec2(1, 2),
Velocity = new Vec2(3, 4)
};
// Serialize to/from JSON
var json = astronaut.ToJson();
var astronaut2 = Astronaut.FromJson(json);
// Assert JSON representations are equal
Assert.AreEqual(json, astronaut2.ToJson());
}