public IEnumerator StarsAreMoving()
{
GameObject starfieldObject = GameObject.Instantiate(starFieldPrefab);
ParticleSystem ps = starfieldObject.GetComponent <ParticleSystem>();
Starfield starfield = starfieldObject.GetComponent <Starfield>();
ParticleSystem.Particle[] particles = new ParticleSystem.Particle[starfield.starCount];
ps.GetParticles(particles);
List <Vector3> pos = particles.Select(it => it.position * 1).ToList();
yield return(new WaitForSecondsRealtime(0.2f));
ps.GetParticles(particles);
List <Vector3> pos2 = particles.Select(it => it.position * 1).ToList();
Assert.True(pos.Select((p, i) => new { p, i }).All(it => it.p.magnitude != pos2[it.i].magnitude));
}