Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/components/tests/test_weakly_connected.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 pytest |
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2 import networkx as nx |
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3 from networkx import NetworkXNotImplemented |
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4 |
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5 |
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6 class TestWeaklyConnected: |
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7 @classmethod |
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8 def setup_class(cls): |
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9 cls.gc = [] |
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10 G = nx.DiGraph() |
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11 G.add_edges_from( |
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12 [ |
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13 (1, 2), |
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14 (2, 3), |
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15 (2, 8), |
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16 (3, 4), |
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17 (3, 7), |
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18 (4, 5), |
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19 (5, 3), |
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20 (5, 6), |
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21 (7, 4), |
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22 (7, 6), |
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23 (8, 1), |
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24 (8, 7), |
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25 ] |
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26 ) |
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27 C = [[3, 4, 5, 7], [1, 2, 8], [6]] |
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28 cls.gc.append((G, C)) |
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29 |
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30 G = nx.DiGraph() |
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31 G.add_edges_from([(1, 2), (1, 3), (1, 4), (4, 2), (3, 4), (2, 3)]) |
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32 C = [[2, 3, 4], [1]] |
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33 cls.gc.append((G, C)) |
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34 |
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35 G = nx.DiGraph() |
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36 G.add_edges_from([(1, 2), (2, 3), (3, 2), (2, 1)]) |
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37 C = [[1, 2, 3]] |
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38 cls.gc.append((G, C)) |
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39 |
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40 # Eppstein's tests |
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41 G = nx.DiGraph({0: [1], 1: [2, 3], 2: [4, 5], 3: [4, 5], 4: [6], 5: [], 6: []}) |
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42 C = [[0], [1], [2], [3], [4], [5], [6]] |
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43 cls.gc.append((G, C)) |
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44 |
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45 G = nx.DiGraph({0: [1], 1: [2, 3, 4], 2: [0, 3], 3: [4], 4: [3]}) |
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46 C = [[0, 1, 2], [3, 4]] |
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47 cls.gc.append((G, C)) |
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48 |
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49 def test_weakly_connected_components(self): |
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50 for G, C in self.gc: |
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51 U = G.to_undirected() |
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52 w = {frozenset(g) for g in nx.weakly_connected_components(G)} |
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53 c = {frozenset(g) for g in nx.connected_components(U)} |
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54 assert w == c |
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55 |
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56 def test_number_weakly_connected_components(self): |
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57 for G, C in self.gc: |
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58 U = G.to_undirected() |
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59 w = nx.number_weakly_connected_components(G) |
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60 c = nx.number_connected_components(U) |
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61 assert w == c |
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62 |
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63 def test_is_weakly_connected(self): |
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64 for G, C in self.gc: |
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65 U = G.to_undirected() |
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66 assert nx.is_weakly_connected(G) == nx.is_connected(U) |
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67 |
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68 def test_null_graph(self): |
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69 G = nx.DiGraph() |
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70 assert list(nx.weakly_connected_components(G)) == [] |
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71 assert nx.number_weakly_connected_components(G) == 0 |
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72 pytest.raises(nx.NetworkXPointlessConcept, nx.is_weakly_connected, G) |
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73 |
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74 def test_connected_raise(self): |
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75 G = nx.Graph() |
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76 pytest.raises(NetworkXNotImplemented, nx.weakly_connected_components, G) |
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77 pytest.raises(NetworkXNotImplemented, nx.number_weakly_connected_components, G) |
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78 pytest.raises(NetworkXNotImplemented, nx.is_weakly_connected, G) |