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import torch
from torch_geometric.data import Data
from torch_geometric.testing import withPackage
from torch_geometric.transforms import Delaunay
@withPackage('scipy')
def test_delaunay():
assert str(Delaunay()) == 'Delaunay()'
pos = torch.tensor([[-1, -1], [-1, 1], [1, 1], [1, -1]], dtype=torch.float)
data = Data(pos=pos)
data = Delaunay()(data)
assert len(data) == 2
assert data.face.tolist() == [[3, 1], [1, 3], [0, 2]]
pos = torch.tensor([[-1, -1], [-1, 1], [1, 1]], dtype=torch.float)
data = Data(pos=pos)
data = Delaunay()(data)
assert len(data) == 2
assert data.face.tolist() == [[0], [1], [2]]
pos = torch.tensor([[-1, -1], [1, 1]], dtype=torch.float)
data = Data(pos=pos)
data = Delaunay()(data)
assert len(data) == 2
assert data.edge_index.tolist() == [[0, 1], [1, 0]]
pos = torch.tensor([[-1, -1]], dtype=torch.float)
data = Data(pos=pos)
data = Delaunay()(data)
assert len(data) == 2
assert data.edge_index.tolist() == [[], []]
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