import torch

from torch_geometric.data import Data
from torch_geometric.transforms import RandomFlip


def test_random_flip():
    assert str(RandomFlip(axis=0)) == 'RandomFlip(axis=0, p=0.5)'

    pos = torch.tensor([[-1.0, 1.0], [-3.0, 0.0], [2.0, -1.0]])

    data = Data(pos=pos)
    data = RandomFlip(axis=0, p=1)(data)
    assert len(data) == 1
    assert data.pos.tolist() == [[1.0, 1.0], [3.0, 0.0], [-2.0, -1.0]]

    data = Data(pos=pos)
    data = RandomFlip(axis=1, p=1)(data)
    assert len(data) == 1
    assert data.pos.tolist() == [[-1.0, -1.0], [-3.0, 0.0], [2.0, 1.0]]