Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/tests/test_tournament.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.tournament` module.""" |
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2 from itertools import combinations |
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3 |
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4 |
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5 from networkx import DiGraph |
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6 from networkx.algorithms.tournament import is_reachable |
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7 from networkx.algorithms.tournament import is_strongly_connected |
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8 from networkx.algorithms.tournament import is_tournament |
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9 from networkx.algorithms.tournament import random_tournament |
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10 from networkx.algorithms.tournament import hamiltonian_path |
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11 |
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12 |
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13 class TestIsTournament: |
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14 """Unit tests for the :func:`networkx.tournament.is_tournament` |
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15 function. |
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16 |
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17 """ |
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18 |
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19 def test_is_tournament(self): |
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20 G = DiGraph() |
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21 G.add_edges_from([(0, 1), (1, 2), (2, 3), (3, 0), (1, 3), (0, 2)]) |
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22 assert is_tournament(G) |
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23 |
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24 def test_self_loops(self): |
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25 """A tournament must have no self-loops.""" |
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26 G = DiGraph() |
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27 G.add_edges_from([(0, 1), (1, 2), (2, 3), (3, 0), (1, 3), (0, 2)]) |
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28 G.add_edge(0, 0) |
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29 assert not is_tournament(G) |
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30 |
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31 def test_missing_edges(self): |
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32 """A tournament must not have any pair of nodes without at least |
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33 one edge joining the pair. |
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34 |
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35 """ |
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36 G = DiGraph() |
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37 G.add_edges_from([(0, 1), (1, 2), (2, 3), (3, 0), (1, 3)]) |
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38 assert not is_tournament(G) |
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39 |
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40 def test_bidirectional_edges(self): |
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41 """A tournament must not have any pair of nodes with greater |
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42 than one edge joining the pair. |
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43 |
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44 """ |
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45 G = DiGraph() |
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46 G.add_edges_from([(0, 1), (1, 2), (2, 3), (3, 0), (1, 3), (0, 2)]) |
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47 G.add_edge(1, 0) |
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48 assert not is_tournament(G) |
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49 |
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50 |
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51 class TestRandomTournament: |
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52 """Unit tests for the :func:`networkx.tournament.random_tournament` |
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53 function. |
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54 |
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55 """ |
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56 |
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57 def test_graph_is_tournament(self): |
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58 for n in range(10): |
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59 G = random_tournament(5) |
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60 assert is_tournament(G) |
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61 |
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62 def test_graph_is_tournament_seed(self): |
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63 for n in range(10): |
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64 G = random_tournament(5, seed=1) |
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65 assert is_tournament(G) |
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66 |
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67 |
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68 class TestHamiltonianPath: |
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69 """Unit tests for the :func:`networkx.tournament.hamiltonian_path` |
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70 function. |
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71 |
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72 """ |
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73 |
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74 def test_path_is_hamiltonian(self): |
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75 G = DiGraph() |
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76 G.add_edges_from([(0, 1), (1, 2), (2, 3), (3, 0), (1, 3), (0, 2)]) |
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77 path = hamiltonian_path(G) |
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78 assert len(path) == 4 |
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79 assert all(v in G[u] for u, v in zip(path, path[1:])) |
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80 |
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81 def test_hamiltonian_cycle(self): |
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82 """Tests that :func:`networkx.tournament.hamiltonian_path` |
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83 returns a Hamiltonian cycle when provided a strongly connected |
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84 tournament. |
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85 |
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86 """ |
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87 G = DiGraph() |
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88 G.add_edges_from([(0, 1), (1, 2), (2, 3), (3, 0), (1, 3), (0, 2)]) |
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89 path = hamiltonian_path(G) |
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90 assert len(path) == 4 |
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91 assert all(v in G[u] for u, v in zip(path, path[1:])) |
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92 assert path[0] in G[path[-1]] |
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93 |
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94 |
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95 class TestReachability: |
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96 """Unit tests for the :func:`networkx.tournament.is_reachable` |
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97 function. |
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98 |
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99 """ |
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100 |
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101 def test_reachable_pair(self): |
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102 """Tests for a reachable pair of nodes.""" |
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103 G = DiGraph([(0, 1), (1, 2), (2, 0)]) |
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104 assert is_reachable(G, 0, 2) |
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105 |
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106 def test_same_node_is_reachable(self): |
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107 """Tests that a node is always reachable from itself.""" |
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108 # G is an arbitrary tournament on ten nodes. |
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109 G = DiGraph(sorted(p) for p in combinations(range(10), 2)) |
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110 assert all(is_reachable(G, v, v) for v in G) |
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111 |
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112 def test_unreachable_pair(self): |
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113 """Tests for an unreachable pair of nodes.""" |
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114 G = DiGraph([(0, 1), (0, 2), (1, 2)]) |
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115 assert not is_reachable(G, 1, 0) |
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116 |
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117 |
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118 class TestStronglyConnected: |
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119 """Unit tests for the |
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120 :func:`networkx.tournament.is_strongly_connected` function. |
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121 |
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122 """ |
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123 |
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124 def test_is_strongly_connected(self): |
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125 """Tests for a strongly connected tournament.""" |
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126 G = DiGraph([(0, 1), (1, 2), (2, 0)]) |
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127 assert is_strongly_connected(G) |
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128 |
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129 def test_not_strongly_connected(self): |
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130 """Tests for a tournament that is not strongly connected.""" |
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131 G = DiGraph([(0, 1), (0, 2), (1, 2)]) |
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132 assert not is_strongly_connected(G) |