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annotate env/lib/python3.9/site-packages/networkx/algorithms/community/tests/test_kernighan_lin.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """Unit tests for the :mod:`networkx.algorithms.community.kernighan_lin` |
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2 module. |
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3 |
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4 """ |
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5 import pytest |
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6 |
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7 import networkx as nx |
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8 from networkx.algorithms.community import kernighan_lin_bisection |
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9 from itertools import permutations |
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10 |
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11 |
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12 def assert_partition_equal(x, y): |
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13 assert set(map(frozenset, x)) == set(map(frozenset, y)) |
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14 |
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15 |
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16 def test_partition(): |
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17 G = nx.barbell_graph(3, 0) |
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18 C = kernighan_lin_bisection(G) |
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19 assert_partition_equal(C, [{0, 1, 2}, {3, 4, 5}]) |
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20 |
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21 |
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22 def test_partition_argument(): |
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23 G = nx.barbell_graph(3, 0) |
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24 partition = [{0, 1, 2}, {3, 4, 5}] |
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25 C = kernighan_lin_bisection(G, partition) |
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26 assert_partition_equal(C, partition) |
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27 |
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28 |
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29 def test_seed_argument(): |
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30 G = nx.barbell_graph(3, 0) |
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31 C = kernighan_lin_bisection(G, seed=1) |
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32 assert_partition_equal(C, [{0, 1, 2}, {3, 4, 5}]) |
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33 |
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34 |
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35 def test_non_disjoint_partition(): |
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36 with pytest.raises(nx.NetworkXError): |
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37 G = nx.barbell_graph(3, 0) |
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38 partition = ({0, 1, 2}, {2, 3, 4, 5}) |
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39 kernighan_lin_bisection(G, partition) |
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40 |
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41 |
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42 def test_too_many_blocks(): |
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43 with pytest.raises(nx.NetworkXError): |
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44 G = nx.barbell_graph(3, 0) |
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45 partition = ({0, 1}, {2}, {3, 4, 5}) |
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46 kernighan_lin_bisection(G, partition) |
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47 |
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48 |
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49 def test_multigraph(): |
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50 G = nx.cycle_graph(4) |
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51 M = nx.MultiGraph(G.edges()) |
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52 M.add_edges_from(G.edges()) |
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53 M.remove_edge(1, 2) |
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54 for labels in permutations(range(4)): |
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55 mapping = dict(zip(M, labels)) |
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56 A, B = kernighan_lin_bisection(nx.relabel_nodes(M, mapping), seed=0) |
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57 assert_partition_equal( |
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58 [A, B], [{mapping[0], mapping[1]}, {mapping[2], mapping[3]}] |
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59 ) |