Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/generators/tests/test_line.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 import pytest |
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3 |
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4 import networkx.generators.line as line |
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5 from networkx.testing.utils import assert_edges_equal |
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6 |
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7 |
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8 def test_node_func(): |
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9 # graph |
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10 G = nx.Graph() |
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11 G.add_edge(1, 2) |
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12 nf = line._node_func(G) |
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13 assert nf(1, 2) == (1, 2) |
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14 assert nf(2, 1) == (1, 2) |
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15 |
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16 # multigraph |
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17 G = nx.MultiGraph() |
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18 G.add_edge(1, 2) |
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19 G.add_edge(1, 2) |
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20 nf = line._node_func(G) |
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21 assert nf(1, 2, 0) == (1, 2, 0) |
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22 assert nf(2, 1, 0) == (1, 2, 0) |
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23 |
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24 |
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25 def test_edge_func(): |
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26 # graph |
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27 G = nx.Graph() |
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28 G.add_edge(1, 2) |
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29 G.add_edge(2, 3) |
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30 ef = line._edge_func(G) |
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31 expected = [(1, 2), (2, 3)] |
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32 assert_edges_equal(ef(), expected) |
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33 |
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34 # digraph |
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35 G = nx.MultiDiGraph() |
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36 G.add_edge(1, 2) |
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37 G.add_edge(2, 3) |
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38 G.add_edge(2, 3) |
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39 ef = line._edge_func(G) |
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40 expected = [(1, 2, 0), (2, 3, 0), (2, 3, 1)] |
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41 result = sorted(ef()) |
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42 assert expected == result |
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43 |
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44 |
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45 def test_sorted_edge(): |
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46 assert (1, 2) == line._sorted_edge(1, 2) |
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47 assert (1, 2) == line._sorted_edge(2, 1) |
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48 |
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49 |
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50 class TestGeneratorLine: |
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51 def test_star(self): |
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52 G = nx.star_graph(5) |
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53 L = nx.line_graph(G) |
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54 assert nx.is_isomorphic(L, nx.complete_graph(5)) |
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55 |
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56 def test_path(self): |
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57 G = nx.path_graph(5) |
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58 L = nx.line_graph(G) |
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59 assert nx.is_isomorphic(L, nx.path_graph(4)) |
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60 |
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61 def test_cycle(self): |
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62 G = nx.cycle_graph(5) |
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63 L = nx.line_graph(G) |
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64 assert nx.is_isomorphic(L, G) |
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65 |
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66 def test_digraph1(self): |
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67 G = nx.DiGraph() |
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68 G.add_edges_from([(0, 1), (0, 2), (0, 3)]) |
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69 L = nx.line_graph(G) |
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70 # no edge graph, but with nodes |
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71 assert L.adj == {(0, 1): {}, (0, 2): {}, (0, 3): {}} |
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72 |
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73 def test_digraph2(self): |
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74 G = nx.DiGraph() |
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75 G.add_edges_from([(0, 1), (1, 2), (2, 3)]) |
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76 L = nx.line_graph(G) |
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77 assert_edges_equal(L.edges(), [((0, 1), (1, 2)), ((1, 2), (2, 3))]) |
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78 |
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79 def test_create1(self): |
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80 G = nx.DiGraph() |
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81 G.add_edges_from([(0, 1), (1, 2), (2, 3)]) |
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82 L = nx.line_graph(G, create_using=nx.Graph()) |
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83 assert_edges_equal(L.edges(), [((0, 1), (1, 2)), ((1, 2), (2, 3))]) |
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84 |
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85 def test_create2(self): |
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86 G = nx.Graph() |
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87 G.add_edges_from([(0, 1), (1, 2), (2, 3)]) |
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88 L = nx.line_graph(G, create_using=nx.DiGraph()) |
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89 assert_edges_equal(L.edges(), [((0, 1), (1, 2)), ((1, 2), (2, 3))]) |
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90 |
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91 |
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92 class TestGeneratorInverseLine: |
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93 def test_example(self): |
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94 G = nx.Graph() |
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95 G_edges = [ |
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96 [1, 2], |
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97 [1, 3], |
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98 [1, 4], |
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99 [1, 5], |
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100 [2, 3], |
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101 [2, 5], |
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102 [2, 6], |
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103 [2, 7], |
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104 [3, 4], |
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105 [3, 5], |
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106 [6, 7], |
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107 [6, 8], |
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108 [7, 8], |
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109 ] |
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110 G.add_edges_from(G_edges) |
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111 H = nx.inverse_line_graph(G) |
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112 solution = nx.Graph() |
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113 solution_edges = [ |
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114 ("a", "b"), |
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115 ("a", "c"), |
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116 ("a", "d"), |
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117 ("a", "e"), |
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118 ("c", "d"), |
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119 ("e", "f"), |
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120 ("e", "g"), |
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121 ("f", "g"), |
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122 ] |
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123 solution.add_edges_from(solution_edges) |
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124 assert nx.is_isomorphic(H, solution) |
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125 |
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126 def test_example_2(self): |
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127 G = nx.Graph() |
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128 G_edges = [[1, 2], [1, 3], [2, 3], [3, 4], [3, 5], [4, 5]] |
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129 G.add_edges_from(G_edges) |
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130 H = nx.inverse_line_graph(G) |
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131 solution = nx.Graph() |
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132 solution_edges = [("a", "c"), ("b", "c"), ("c", "d"), ("d", "e"), ("d", "f")] |
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133 solution.add_edges_from(solution_edges) |
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134 assert nx.is_isomorphic(H, solution) |
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135 |
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136 def test_pair(self): |
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137 G = nx.path_graph(2) |
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138 H = nx.inverse_line_graph(G) |
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139 solution = nx.path_graph(3) |
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140 assert nx.is_isomorphic(H, solution) |
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141 |
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142 def test_line(self): |
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143 G = nx.path_graph(5) |
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144 solution = nx.path_graph(6) |
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145 H = nx.inverse_line_graph(G) |
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146 assert nx.is_isomorphic(H, solution) |
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147 |
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148 def test_triangle_graph(self): |
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149 G = nx.complete_graph(3) |
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150 H = nx.inverse_line_graph(G) |
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151 alternative_solution = nx.Graph() |
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152 alternative_solution.add_edges_from([[0, 1], [0, 2], [0, 3]]) |
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153 # there are two alternative inverse line graphs for this case |
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154 # so long as we get one of them the test should pass |
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155 assert nx.is_isomorphic(H, G) or nx.is_isomorphic(H, alternative_solution) |
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156 |
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157 def test_cycle(self): |
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158 G = nx.cycle_graph(5) |
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159 H = nx.inverse_line_graph(G) |
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160 assert nx.is_isomorphic(H, G) |
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161 |
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162 def test_empty(self): |
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163 G = nx.Graph() |
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164 H = nx.inverse_line_graph(G) |
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165 assert nx.is_isomorphic(H, nx.complete_graph(1)) |
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166 |
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167 def test_K1(self): |
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168 G = nx.complete_graph(1) |
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169 H = nx.inverse_line_graph(G) |
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170 solution = nx.path_graph(2) |
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171 assert nx.is_isomorphic(H, solution) |
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172 |
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173 def test_claw(self): |
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174 # This is the simplest non-line graph |
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175 G = nx.Graph() |
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176 G_edges = [[0, 1], [0, 2], [0, 3]] |
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177 G.add_edges_from(G_edges) |
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178 pytest.raises(nx.NetworkXError, nx.inverse_line_graph, G) |
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179 |
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180 def test_non_line_graph(self): |
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181 # These are other non-line graphs |
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182 |
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183 # wheel graph with 6 nodes |
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184 G = nx.Graph() |
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185 G_edges = [ |
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186 [0, 1], |
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187 [0, 2], |
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188 [0, 3], |
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189 [0, 4], |
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190 [0, 5], |
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191 [1, 2], |
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192 [2, 3], |
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193 [3, 4], |
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194 [4, 5], |
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195 [5, 1], |
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196 ] |
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197 G.add_edges_from(G_edges) |
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198 pytest.raises(nx.NetworkXError, nx.inverse_line_graph, G) |
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199 |
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200 # 3---4---5 |
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201 # / \ / \ / |
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202 # 0---1---2 |
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203 G = nx.Graph() |
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204 G_edges = [ |
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205 [0, 1], |
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206 [1, 2], |
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207 [3, 4], |
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208 [4, 5], |
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209 [0, 3], |
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210 [1, 3], |
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211 [1, 4], |
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212 [2, 4], |
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213 [2, 5], |
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214 ] |
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215 G.add_edges_from(G_edges) |
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216 pytest.raises(nx.NetworkXError, nx.inverse_line_graph, G) |
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217 |
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218 # K_5 minus an edge |
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219 K5me = nx.complete_graph(5) |
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220 K5me.remove_edge(0, 1) |
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221 pytest.raises(nx.NetworkXError, nx.inverse_line_graph, K5me) |
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222 |
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223 def test_wrong_graph_type(self): |
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224 G = nx.DiGraph() |
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225 G_edges = [[0, 1], [0, 2], [0, 3]] |
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226 G.add_edges_from(G_edges) |
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227 pytest.raises(nx.NetworkXNotImplemented, nx.inverse_line_graph, G) |
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228 |
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229 G = nx.MultiGraph() |
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230 G_edges = [[0, 1], [0, 2], [0, 3]] |
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231 G.add_edges_from(G_edges) |
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232 pytest.raises(nx.NetworkXNotImplemented, nx.inverse_line_graph, G) |
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233 |
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234 def test_line_inverse_line_complete(self): |
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235 G = nx.complete_graph(10) |
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236 H = nx.line_graph(G) |
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237 J = nx.inverse_line_graph(H) |
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238 assert nx.is_isomorphic(G, J) |
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239 |
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240 def test_line_inverse_line_path(self): |
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241 G = nx.path_graph(10) |
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242 H = nx.line_graph(G) |
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243 J = nx.inverse_line_graph(H) |
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244 assert nx.is_isomorphic(G, J) |
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245 |
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246 def test_line_inverse_line_hypercube(self): |
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247 G = nx.hypercube_graph(5) |
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248 H = nx.line_graph(G) |
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249 J = nx.inverse_line_graph(H) |
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250 assert nx.is_isomorphic(G, J) |
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251 |
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252 def test_line_inverse_line_cycle(self): |
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253 G = nx.cycle_graph(10) |
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254 H = nx.line_graph(G) |
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255 J = nx.inverse_line_graph(H) |
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256 assert nx.is_isomorphic(G, J) |
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257 |
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258 def test_line_inverse_line_star(self): |
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259 G = nx.star_graph(20) |
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260 H = nx.line_graph(G) |
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261 J = nx.inverse_line_graph(H) |
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262 assert nx.is_isomorphic(G, J) |
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263 |
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264 def test_line_inverse_line_multipartite(self): |
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265 G = nx.complete_multipartite_graph(3, 4, 5) |
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266 H = nx.line_graph(G) |
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267 J = nx.inverse_line_graph(H) |
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268 assert nx.is_isomorphic(G, J) |
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269 |
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270 def test_line_inverse_line_dgm(self): |
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271 G = nx.dorogovtsev_goltsev_mendes_graph(4) |
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272 H = nx.line_graph(G) |
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273 J = nx.inverse_line_graph(H) |
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274 assert nx.is_isomorphic(G, J) |