Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/tests/test_bridges.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 bridge-finding algorithms.""" |
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2 |
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3 import networkx as nx |
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4 |
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5 |
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6 class TestBridges: |
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7 """Unit tests for the bridge-finding function.""" |
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8 |
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9 def test_single_bridge(self): |
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10 edges = [ |
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11 # DFS tree edges. |
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12 (1, 2), |
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13 (2, 3), |
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14 (3, 4), |
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15 (3, 5), |
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16 (5, 6), |
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17 (6, 7), |
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18 (7, 8), |
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19 (5, 9), |
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20 (9, 10), |
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21 # Nontree edges. |
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22 (1, 3), |
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23 (1, 4), |
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24 (2, 5), |
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25 (5, 10), |
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26 (6, 8), |
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27 ] |
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28 G = nx.Graph(edges) |
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29 source = 1 |
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30 bridges = list(nx.bridges(G, source)) |
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31 assert bridges == [(5, 6)] |
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32 |
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33 def test_barbell_graph(self): |
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34 # The (3, 0) barbell graph has two triangles joined by a single edge. |
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35 G = nx.barbell_graph(3, 0) |
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36 source = 0 |
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37 bridges = list(nx.bridges(G, source)) |
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38 assert bridges == [(2, 3)] |
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39 |
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40 |
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41 class TestLocalBridges: |
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42 """Unit tests for the local_bridge function.""" |
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43 |
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44 @classmethod |
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45 def setup_class(cls): |
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46 cls.BB = nx.barbell_graph(4, 0) |
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47 cls.square = nx.cycle_graph(4) |
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48 cls.tri = nx.cycle_graph(3) |
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49 |
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50 def test_nospan(self): |
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51 expected = {(3, 4), (4, 3)} |
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52 assert next(nx.local_bridges(self.BB, with_span=False)) in expected |
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53 assert set(nx.local_bridges(self.square, with_span=False)) == self.square.edges |
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54 assert list(nx.local_bridges(self.tri, with_span=False)) == [] |
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55 |
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56 def test_no_weight(self): |
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57 inf = float("inf") |
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58 expected = {(3, 4, inf), (4, 3, inf)} |
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59 assert next(nx.local_bridges(self.BB)) in expected |
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60 expected = {(u, v, 3) for u, v, in self.square.edges} |
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61 assert set(nx.local_bridges(self.square)) == expected |
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62 assert list(nx.local_bridges(self.tri)) == [] |
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63 |
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64 def test_weight(self): |
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65 inf = float("inf") |
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66 G = self.square.copy() |
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67 |
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68 G.edges[1, 2]["weight"] = 2 |
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69 expected = {(u, v, 5 - wt) for u, v, wt in G.edges(data="weight", default=1)} |
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70 assert set(nx.local_bridges(G, weight="weight")) == expected |
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71 |
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72 expected = {(u, v, 6) for u, v in G.edges} |
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73 lb = nx.local_bridges(G, weight=lambda u, v, d: 2) |
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74 assert set(lb) == expected |