Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/algorithms/tree/tests/test_recognition.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 pytest |
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2 import networkx as nx |
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3 |
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4 |
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5 class TestTreeRecognition: |
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6 |
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7 graph = nx.Graph |
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8 multigraph = nx.MultiGraph |
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9 |
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10 @classmethod |
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11 def setup_class(cls): |
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12 |
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13 cls.T1 = cls.graph() |
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14 |
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15 cls.T2 = cls.graph() |
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16 cls.T2.add_node(1) |
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17 |
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18 cls.T3 = cls.graph() |
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19 cls.T3.add_nodes_from(range(5)) |
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20 edges = [(i, i + 1) for i in range(4)] |
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21 cls.T3.add_edges_from(edges) |
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22 |
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23 cls.T5 = cls.multigraph() |
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24 cls.T5.add_nodes_from(range(5)) |
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25 edges = [(i, i + 1) for i in range(4)] |
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26 cls.T5.add_edges_from(edges) |
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27 |
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28 cls.T6 = cls.graph() |
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29 cls.T6.add_nodes_from([6, 7]) |
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30 cls.T6.add_edge(6, 7) |
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31 |
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32 cls.F1 = nx.compose(cls.T6, cls.T3) |
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33 |
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34 cls.N4 = cls.graph() |
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35 cls.N4.add_node(1) |
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36 cls.N4.add_edge(1, 1) |
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37 |
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38 cls.N5 = cls.graph() |
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39 cls.N5.add_nodes_from(range(5)) |
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40 |
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41 cls.N6 = cls.graph() |
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42 cls.N6.add_nodes_from(range(3)) |
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43 cls.N6.add_edges_from([(0, 1), (1, 2), (2, 0)]) |
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44 |
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45 cls.NF1 = nx.compose(cls.T6, cls.N6) |
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46 |
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47 def test_null_tree(self): |
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48 with pytest.raises(nx.NetworkXPointlessConcept): |
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49 nx.is_tree(self.graph()) |
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50 |
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51 def test_null_tree2(self): |
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52 with pytest.raises(nx.NetworkXPointlessConcept): |
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53 nx.is_tree(self.multigraph()) |
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54 |
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55 def test_null_forest(self): |
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56 with pytest.raises(nx.NetworkXPointlessConcept): |
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57 nx.is_forest(self.graph()) |
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58 |
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59 def test_null_forest2(self): |
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60 with pytest.raises(nx.NetworkXPointlessConcept): |
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61 nx.is_forest(self.multigraph()) |
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62 |
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63 def test_is_tree(self): |
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64 assert nx.is_tree(self.T2) |
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65 assert nx.is_tree(self.T3) |
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66 assert nx.is_tree(self.T5) |
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67 |
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68 def test_is_not_tree(self): |
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69 assert not nx.is_tree(self.N4) |
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70 assert not nx.is_tree(self.N5) |
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71 assert not nx.is_tree(self.N6) |
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72 |
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73 def test_is_forest(self): |
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74 assert nx.is_forest(self.T2) |
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75 assert nx.is_forest(self.T3) |
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76 assert nx.is_forest(self.T5) |
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77 assert nx.is_forest(self.F1) |
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78 assert nx.is_forest(self.N5) |
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79 |
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80 def test_is_not_forest(self): |
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81 assert not nx.is_forest(self.N4) |
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82 assert not nx.is_forest(self.N6) |
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83 assert not nx.is_forest(self.NF1) |
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84 |
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85 |
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86 class TestDirectedTreeRecognition(TestTreeRecognition): |
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87 graph = nx.DiGraph |
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88 multigraph = nx.MultiDiGraph |
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89 |
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90 |
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91 def test_disconnected_graph(): |
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92 # https://github.com/networkx/networkx/issues/1144 |
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93 G = nx.Graph() |
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94 G.add_edges_from([(0, 1), (1, 2), (2, 0), (3, 4)]) |
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95 assert not nx.is_tree(G) |
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96 |
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97 G = nx.DiGraph() |
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98 G.add_edges_from([(0, 1), (1, 2), (2, 0), (3, 4)]) |
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99 assert not nx.is_tree(G) |
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100 |
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101 |
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102 def test_dag_nontree(): |
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103 G = nx.DiGraph() |
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104 G.add_edges_from([(0, 1), (0, 2), (1, 2)]) |
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105 assert not nx.is_tree(G) |
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106 assert nx.is_directed_acyclic_graph(G) |
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107 |
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108 |
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109 def test_multicycle(): |
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110 G = nx.MultiDiGraph() |
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111 G.add_edges_from([(0, 1), (0, 1)]) |
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112 assert not nx.is_tree(G) |
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113 assert nx.is_directed_acyclic_graph(G) |
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114 |
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115 |
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116 def test_emptybranch(): |
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117 G = nx.DiGraph() |
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118 G.add_nodes_from(range(10)) |
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119 assert nx.is_branching(G) |
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120 assert not nx.is_arborescence(G) |
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121 |
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122 |
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123 def test_path(): |
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124 G = nx.DiGraph() |
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125 nx.add_path(G, range(5)) |
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126 assert nx.is_branching(G) |
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127 assert nx.is_arborescence(G) |
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128 |
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129 |
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130 def test_notbranching1(): |
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131 # Acyclic violation. |
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132 G = nx.MultiDiGraph() |
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133 G.add_nodes_from(range(10)) |
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134 G.add_edges_from([(0, 1), (1, 0)]) |
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135 assert not nx.is_branching(G) |
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136 assert not nx.is_arborescence(G) |
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137 |
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138 |
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139 def test_notbranching2(): |
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140 # In-degree violation. |
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141 G = nx.MultiDiGraph() |
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142 G.add_nodes_from(range(10)) |
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143 G.add_edges_from([(0, 1), (0, 2), (3, 2)]) |
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144 assert not nx.is_branching(G) |
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145 assert not nx.is_arborescence(G) |
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146 |
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147 |
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148 def test_notarborescence1(): |
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149 # Not an arborescence due to not spanning. |
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150 G = nx.MultiDiGraph() |
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151 G.add_nodes_from(range(10)) |
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152 G.add_edges_from([(0, 1), (0, 2), (1, 3), (5, 6)]) |
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153 assert nx.is_branching(G) |
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154 assert not nx.is_arborescence(G) |
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155 |
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156 |
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157 def test_notarborescence2(): |
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158 # Not an arborescence due to in-degree violation. |
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159 G = nx.MultiDiGraph() |
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160 nx.add_path(G, range(5)) |
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161 G.add_edge(6, 4) |
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162 assert not nx.is_branching(G) |
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163 assert not nx.is_arborescence(G) |