public void Test_S2Cap_EncodeDecode()
{
S2Cap cap = S2Cap.FromCenterHeight(new S2Point(3, 2, 1).Normalize(), 1);
Encoder encoder = new();
cap.Encode(encoder);
var decoder = encoder.Decoder();
var(success, decoded_cap) = S2Cap.Decode(decoder);
Assert.True(success);
Assert.Equal(cap, decoded_cap);
}