def test_no_parallel_edges(self):
with self.assertRaises(ValueError):
PrimitiveCell((1, 0, 0), (1, 0, 0), (0, 0, 1),
BravaisLattice.CUBIC)
def test_edge_lengths_positive(self):
with self.assertRaises(ValueError):
PrimitiveCell((0, 0, 0), (0, 0, 0), (0, 0, 0),
BravaisLattice.CUBIC)
