Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/tests/test_euler.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 import collections |
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2 |
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3 import pytest |
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4 |
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5 import networkx as nx |
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6 |
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7 |
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8 class TestIsEulerian: |
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9 def test_is_eulerian(self): |
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10 assert nx.is_eulerian(nx.complete_graph(5)) |
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11 assert nx.is_eulerian(nx.complete_graph(7)) |
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12 assert nx.is_eulerian(nx.hypercube_graph(4)) |
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13 assert nx.is_eulerian(nx.hypercube_graph(6)) |
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14 |
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15 assert not nx.is_eulerian(nx.complete_graph(4)) |
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16 assert not nx.is_eulerian(nx.complete_graph(6)) |
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17 assert not nx.is_eulerian(nx.hypercube_graph(3)) |
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18 assert not nx.is_eulerian(nx.hypercube_graph(5)) |
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19 |
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20 assert not nx.is_eulerian(nx.petersen_graph()) |
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21 assert not nx.is_eulerian(nx.path_graph(4)) |
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22 |
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23 def test_is_eulerian2(self): |
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24 # not connected |
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25 G = nx.Graph() |
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26 G.add_nodes_from([1, 2, 3]) |
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27 assert not nx.is_eulerian(G) |
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28 # not strongly connected |
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29 G = nx.DiGraph() |
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30 G.add_nodes_from([1, 2, 3]) |
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31 assert not nx.is_eulerian(G) |
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32 G = nx.MultiDiGraph() |
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33 G.add_edge(1, 2) |
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34 G.add_edge(2, 3) |
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35 G.add_edge(2, 3) |
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36 G.add_edge(3, 1) |
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37 assert not nx.is_eulerian(G) |
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38 |
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39 |
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40 class TestEulerianCircuit: |
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41 def test_eulerian_circuit_cycle(self): |
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42 G = nx.cycle_graph(4) |
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43 |
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44 edges = list(nx.eulerian_circuit(G, source=0)) |
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45 nodes = [u for u, v in edges] |
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46 assert nodes == [0, 3, 2, 1] |
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47 assert edges == [(0, 3), (3, 2), (2, 1), (1, 0)] |
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48 |
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49 edges = list(nx.eulerian_circuit(G, source=1)) |
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50 nodes = [u for u, v in edges] |
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51 assert nodes == [1, 2, 3, 0] |
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52 assert edges == [(1, 2), (2, 3), (3, 0), (0, 1)] |
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53 |
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54 G = nx.complete_graph(3) |
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55 |
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56 edges = list(nx.eulerian_circuit(G, source=0)) |
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57 nodes = [u for u, v in edges] |
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58 assert nodes == [0, 2, 1] |
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59 assert edges == [(0, 2), (2, 1), (1, 0)] |
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60 |
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61 edges = list(nx.eulerian_circuit(G, source=1)) |
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62 nodes = [u for u, v in edges] |
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63 assert nodes == [1, 2, 0] |
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64 assert edges == [(1, 2), (2, 0), (0, 1)] |
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65 |
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66 def test_eulerian_circuit_digraph(self): |
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67 G = nx.DiGraph() |
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68 nx.add_cycle(G, [0, 1, 2, 3]) |
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69 |
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70 edges = list(nx.eulerian_circuit(G, source=0)) |
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71 nodes = [u for u, v in edges] |
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72 assert nodes == [0, 1, 2, 3] |
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73 assert edges == [(0, 1), (1, 2), (2, 3), (3, 0)] |
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74 |
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75 edges = list(nx.eulerian_circuit(G, source=1)) |
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76 nodes = [u for u, v in edges] |
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77 assert nodes == [1, 2, 3, 0] |
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78 assert edges == [(1, 2), (2, 3), (3, 0), (0, 1)] |
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79 |
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80 def test_multigraph(self): |
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81 G = nx.MultiGraph() |
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82 nx.add_cycle(G, [0, 1, 2, 3]) |
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83 G.add_edge(1, 2) |
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84 G.add_edge(1, 2) |
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85 edges = list(nx.eulerian_circuit(G, source=0)) |
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86 nodes = [u for u, v in edges] |
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87 assert nodes == [0, 3, 2, 1, 2, 1] |
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88 assert edges == [(0, 3), (3, 2), (2, 1), (1, 2), (2, 1), (1, 0)] |
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89 |
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90 def test_multigraph_with_keys(self): |
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91 G = nx.MultiGraph() |
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92 nx.add_cycle(G, [0, 1, 2, 3]) |
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93 G.add_edge(1, 2) |
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94 G.add_edge(1, 2) |
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95 edges = list(nx.eulerian_circuit(G, source=0, keys=True)) |
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96 nodes = [u for u, v, k in edges] |
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97 assert nodes == [0, 3, 2, 1, 2, 1] |
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98 assert edges[:2] == [(0, 3, 0), (3, 2, 0)] |
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99 assert collections.Counter(edges[2:5]) == collections.Counter( |
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100 [(2, 1, 0), (1, 2, 1), (2, 1, 2)] |
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101 ) |
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102 assert edges[5:] == [(1, 0, 0)] |
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103 |
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104 def test_not_eulerian(self): |
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105 with pytest.raises(nx.NetworkXError): |
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106 f = list(nx.eulerian_circuit(nx.complete_graph(4))) |
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107 |
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108 |
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109 class TestIsSemiEulerian: |
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110 def test_is_semieulerian(self): |
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111 # Test graphs with Eulerian paths but no cycles return True. |
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112 assert nx.is_semieulerian(nx.path_graph(4)) |
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113 G = nx.path_graph(6, create_using=nx.DiGraph) |
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114 assert nx.is_semieulerian(G) |
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115 |
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116 # Test graphs with Eulerian cycles return False. |
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117 assert not nx.is_semieulerian(nx.complete_graph(5)) |
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118 assert not nx.is_semieulerian(nx.complete_graph(7)) |
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119 assert not nx.is_semieulerian(nx.hypercube_graph(4)) |
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120 assert not nx.is_semieulerian(nx.hypercube_graph(6)) |
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121 |
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122 |
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123 class TestHasEulerianPath: |
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124 def test_has_eulerian_path_cyclic(self): |
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125 # Test graphs with Eulerian cycles return True. |
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126 assert nx.has_eulerian_path(nx.complete_graph(5)) |
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127 assert nx.has_eulerian_path(nx.complete_graph(7)) |
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128 assert nx.has_eulerian_path(nx.hypercube_graph(4)) |
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129 assert nx.has_eulerian_path(nx.hypercube_graph(6)) |
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130 |
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131 def test_has_eulerian_path_non_cyclic(self): |
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132 # Test graphs with Eulerian paths but no cycles return True. |
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133 assert nx.has_eulerian_path(nx.path_graph(4)) |
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134 G = nx.path_graph(6, create_using=nx.DiGraph) |
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135 assert nx.has_eulerian_path(G) |
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136 |
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137 |
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138 class TestFindPathStart: |
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139 def testfind_path_start(self): |
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140 find_path_start = nx.algorithms.euler._find_path_start |
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141 # Test digraphs return correct starting node. |
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142 G = nx.path_graph(6, create_using=nx.DiGraph) |
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143 assert find_path_start(G) == 0 |
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144 edges = [(0, 1), (1, 2), (2, 0), (4, 0)] |
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145 assert find_path_start(nx.DiGraph(edges)) == 4 |
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146 |
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147 # Test graph with no Eulerian path return None. |
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148 edges = [(0, 1), (1, 2), (2, 3), (2, 4)] |
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149 assert find_path_start(nx.DiGraph(edges)) is None |
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150 |
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151 |
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152 class TestEulerianPath: |
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153 def test_eulerian_path(self): |
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154 x = [(4, 0), (0, 1), (1, 2), (2, 0)] |
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155 for e1, e2 in zip(x, nx.eulerian_path(nx.DiGraph(x))): |
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156 assert e1 == e2 |
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157 |
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158 |
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159 class TestEulerize: |
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160 def test_disconnected(self): |
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161 with pytest.raises(nx.NetworkXError): |
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162 G = nx.from_edgelist([(0, 1), (2, 3)]) |
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163 nx.eulerize(G) |
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164 |
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165 def test_null_graph(self): |
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166 with pytest.raises(nx.NetworkXPointlessConcept): |
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167 nx.eulerize(nx.Graph()) |
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168 |
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169 def test_null_multigraph(self): |
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170 with pytest.raises(nx.NetworkXPointlessConcept): |
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171 nx.eulerize(nx.MultiGraph()) |
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172 |
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173 def test_on_empty_graph(self): |
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174 with pytest.raises(nx.NetworkXError): |
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175 nx.eulerize(nx.empty_graph(3)) |
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176 |
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177 def test_on_eulerian(self): |
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178 G = nx.cycle_graph(3) |
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179 H = nx.eulerize(G) |
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180 assert nx.is_isomorphic(G, H) |
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181 |
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182 def test_on_eulerian_multigraph(self): |
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183 G = nx.MultiGraph(nx.cycle_graph(3)) |
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184 G.add_edge(0, 1) |
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185 H = nx.eulerize(G) |
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186 assert nx.is_eulerian(H) |
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187 |
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188 def test_on_complete_graph(self): |
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189 G = nx.complete_graph(4) |
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190 assert nx.is_eulerian(nx.eulerize(G)) |
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191 assert nx.is_eulerian(nx.eulerize(nx.MultiGraph(G))) |