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"""Tests of graph."""
import numpy as np
from scipy.sparse import csr_array
from symfc.utils.graph import connected_components
def test_connected_components():
"""Test connected_component using DFS."""
mat = np.array(
[
[5, 4, 0, 2, 0, 0, 0, 0],
[4, 3, 0, 1, 0, 0, 0, 0],
[0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 4, 0, 0, 0, 0],
[0, 0, 0, 0, 5, 3, 0, 1],
[0, 0, 0, 0, 3, 4, 1, 2],
[0, 0, 0, 0, 7, 8, 1, 0],
[0, 0, 0, 0, 7, 2, 0, 1],
]
)
mat = csr_array(mat + mat.T)
group = connected_components(mat)
np.testing.assert_array_equal(group[0], [0, 1, 3])
np.testing.assert_array_equal(group[1], [2])
np.testing.assert_array_equal(group[2], [4, 5, 6, 7])
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