[Test, CloseAfterFirstFrame]
public void NewSystemHasListInitialized()
{
    Assert.IsNotNull(particleSystem.AttachedEmitters);
}

[Test, CloseAfterFirstFrame]
public void NewSystemHasListInitialized()
{
    Assert.IsNotNull(particleSystem.AttachedEmitters);
}

[Test, CloseAfterFirstFrame]
public void AttachingEmitterSetsPositionAndRotation()
{
    particleSystem.Position = Vector3D.UnitY;
    particleSystem.Orientation = Quaternion.FromAxisAngle(Vector3D.UnitZ, 45);
    var emitter = CreateAndAttachEmitter(Vector3D.UnitX);
    particleSystem.FireBurstOfAllEmitters();
    particleSystem.FireBurstAtRelativePosition(Vector3D.One);
    particleSystem.FireBurstAtRelativePositionAndRotation(Vector3D.One, 0.5f);
    Assert.AreEqual(particleSystem.Position, emitter.Position);
    Assert.AreEqual(particleSystem.Orientation, emitter.Rotation);
    Assert.IsTrue(particleSystem.IsActive);
    particleSystem.IsActive = false;
    Assert.IsFalse(particleSystem.IsActive);
}

[Test, CloseAfterFirstFrame]
public void AttachingEmitterSetsPositionAndRotation()
{
    particleSystem.Position = Vector3D.UnitY;
    particleSystem.Orientation = Quaternion.FromAxisAngle(Vector3D.UnitZ, 45);
    var emitter = CreateAndAttachEmitter(Vector3D.UnitX);
    particleSystem.FireBurstOfAllEmitters();
    particleSystem.FireBurstAtRelativePosition(Vector3D.One);
    particleSystem.FireBurstAtRelativePositionAndRotation(Vector3D.One, 0.5f);
    Assert.AreEqual(particleSystem.Position, emitter.Position);
    Assert.AreEqual(particleSystem.Orientation, emitter.Rotation);
    Assert.IsTrue(particleSystem.IsActive);
    particleSystem.IsActive = false;
    Assert.IsFalse(particleSystem.IsActive);
}

[Test, CloseAfterFirstFrame]
public void DisposeEmitterDeactivates()
{
    var emitterAlpha = CreateAndAttachEmitter(Vector3D.Zero);
    var emitterBeta = CreateAndAttachEmitter(Vector3D.UnitY);
    particleSystem.DisposeEmitter(1);
    particleSystem.DisposeEmitter(emitterAlpha);
    particleSystem.DisposeEmitter(emitterAlpha);
    Assert.IsFalse(emitterAlpha.IsActive);
    Assert.IsFalse(emitterBeta.IsActive);
    Assert.AreEqual(0, particleSystem.AttachedEmitters.Count);
}

[Test, CloseAfterFirstFrame]
public void DisposeEmitterDeactivates()
{
    var emitterAlpha = CreateAndAttachEmitter(Vector3D.Zero);
    var emitterBeta = CreateAndAttachEmitter(Vector3D.UnitY);
    particleSystem.DisposeEmitter(1);
    particleSystem.DisposeEmitter(emitterAlpha);
    particleSystem.DisposeEmitter(emitterAlpha);
    Assert.IsFalse(emitterAlpha.IsActive);
    Assert.IsFalse(emitterBeta.IsActive);
    Assert.AreEqual(0, particleSystem.AttachedEmitters.Count);
}