Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/tests/test_covering.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 import networkx as nx |
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2 |
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3 |
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4 class TestMinEdgeCover: |
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5 """Tests for :func:`networkx.algorithms.min_edge_cover`""" |
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6 |
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7 def test_empty_graph(self): |
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8 G = nx.Graph() |
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9 assert nx.min_edge_cover(G) == set() |
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10 |
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11 def test_graph_with_loop(self): |
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12 G = nx.Graph() |
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13 G.add_edge(0, 0) |
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14 assert nx.min_edge_cover(G) == {(0, 0)} |
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15 |
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16 def test_graph_single_edge(self): |
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17 G = nx.Graph() |
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18 G.add_edge(0, 1) |
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19 assert nx.min_edge_cover(G) in ({(0, 1)}, {(1, 0)}) |
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20 |
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21 def test_bipartite_explicit(self): |
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22 G = nx.Graph() |
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23 G.add_nodes_from([1, 2, 3, 4], bipartite=0) |
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24 G.add_nodes_from(["a", "b", "c"], bipartite=1) |
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25 G.add_edges_from([(1, "a"), (1, "b"), (2, "b"), (2, "c"), (3, "c"), (4, "a")]) |
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26 min_cover = nx.min_edge_cover( |
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27 G, nx.algorithms.bipartite.matching.eppstein_matching |
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28 ) |
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29 min_cover2 = nx.min_edge_cover(G) |
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30 assert nx.is_edge_cover(G, min_cover) |
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31 assert len(min_cover) == 8 |
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32 |
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33 def test_complete_graph(self): |
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34 G = nx.complete_graph(10) |
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35 min_cover = nx.min_edge_cover(G) |
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36 assert nx.is_edge_cover(G, min_cover) |
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37 assert len(min_cover) == 5 |
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38 |
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39 |
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40 class TestIsEdgeCover: |
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41 """Tests for :func:`networkx.algorithms.is_edge_cover`""" |
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42 |
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43 def test_empty_graph(self): |
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44 G = nx.Graph() |
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45 assert nx.is_edge_cover(G, set()) |
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46 |
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47 def test_graph_with_loop(self): |
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48 G = nx.Graph() |
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49 G.add_edge(1, 1) |
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50 assert nx.is_edge_cover(G, {(1, 1)}) |
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51 |
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52 def test_graph_single_edge(self): |
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53 G = nx.Graph() |
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54 G.add_edge(0, 1) |
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55 assert nx.is_edge_cover(G, {(0, 0), (1, 1)}) |
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56 assert nx.is_edge_cover(G, {(0, 1), (1, 0)}) |
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57 assert nx.is_edge_cover(G, {(0, 1)}) |
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58 assert not nx.is_edge_cover(G, {(0, 0)}) |