Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/readwrite/tests/test_graph6.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 from io import BytesIO |
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2 import tempfile |
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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 import networkx.readwrite.graph6 as g6 |
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7 from networkx.testing.utils import assert_edges_equal |
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8 from networkx.testing.utils import assert_nodes_equal |
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9 |
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10 |
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11 class TestGraph6Utils: |
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12 def test_n_data_n_conversion(self): |
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13 for i in [0, 1, 42, 62, 63, 64, 258047, 258048, 7744773, 68719476735]: |
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14 assert g6.data_to_n(g6.n_to_data(i))[0] == i |
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15 assert g6.data_to_n(g6.n_to_data(i))[1] == [] |
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16 assert g6.data_to_n(g6.n_to_data(i) + [42, 43])[1] == [42, 43] |
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17 |
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18 |
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19 class TestFromGraph6Bytes: |
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20 def test_from_graph6_bytes(self): |
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21 data = b"DF{" |
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22 G = nx.from_graph6_bytes(data) |
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23 assert_nodes_equal(G.nodes(), [0, 1, 2, 3, 4]) |
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24 assert_edges_equal( |
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25 G.edges(), [(0, 3), (0, 4), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)] |
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26 ) |
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27 |
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28 def test_read_equals_from_bytes(self): |
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29 data = b"DF{" |
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30 G = nx.from_graph6_bytes(data) |
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31 fh = BytesIO(data) |
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32 Gin = nx.read_graph6(fh) |
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33 assert_nodes_equal(G.nodes(), Gin.nodes()) |
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34 assert_edges_equal(G.edges(), Gin.edges()) |
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35 |
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36 |
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37 class TestReadGraph6: |
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38 def test_read_many_graph6(self): |
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39 """Test for reading many graphs from a file into a list.""" |
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40 data = b"DF{\nD`{\nDqK\nD~{\n" |
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41 fh = BytesIO(data) |
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42 glist = nx.read_graph6(fh) |
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43 assert len(glist) == 4 |
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44 for G in glist: |
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45 assert sorted(G) == list(range(5)) |
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46 |
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47 |
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48 class TestWriteGraph6: |
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49 """Unit tests for writing a graph to a file in graph6 format.""" |
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50 |
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51 def test_null_graph(self): |
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52 result = BytesIO() |
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53 nx.write_graph6(nx.null_graph(), result) |
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54 assert result.getvalue() == b">>graph6<<?\n" |
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55 |
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56 def test_trivial_graph(self): |
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57 result = BytesIO() |
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58 nx.write_graph6(nx.trivial_graph(), result) |
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59 assert result.getvalue() == b">>graph6<<@\n" |
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60 |
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61 def test_complete_graph(self): |
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62 result = BytesIO() |
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63 nx.write_graph6(nx.complete_graph(4), result) |
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64 assert result.getvalue() == b">>graph6<<C~\n" |
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65 |
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66 def test_large_complete_graph(self): |
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67 result = BytesIO() |
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68 nx.write_graph6(nx.complete_graph(67), result, header=False) |
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69 assert result.getvalue() == b"~?@B" + b"~" * 368 + b"w\n" |
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70 |
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71 def test_no_header(self): |
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72 result = BytesIO() |
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73 nx.write_graph6(nx.complete_graph(4), result, header=False) |
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74 assert result.getvalue() == b"C~\n" |
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75 |
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76 def test_complete_bipartite_graph(self): |
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77 result = BytesIO() |
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78 G = nx.complete_bipartite_graph(6, 9) |
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79 nx.write_graph6(G, result, header=False) |
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80 # The expected encoding here was verified by Sage. |
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81 assert result.getvalue() == b"N??F~z{~Fw^_~?~?^_?\n" |
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82 |
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83 def test_no_directed_graphs(self): |
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84 with pytest.raises(nx.NetworkXNotImplemented): |
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85 nx.write_graph6(nx.DiGraph(), BytesIO()) |
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86 |
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87 def test_length(self): |
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88 for i in list(range(13)) + [31, 47, 62, 63, 64, 72]: |
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89 g = nx.random_graphs.gnm_random_graph(i, i * i // 4, seed=i) |
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90 gstr = BytesIO() |
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91 nx.write_graph6(g, gstr, header=False) |
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92 # Strip the trailing newline. |
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93 gstr = gstr.getvalue().rstrip() |
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94 assert len(gstr) == ((i - 1) * i // 2 + 5) // 6 + (1 if i < 63 else 4) |
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95 |
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96 def test_roundtrip(self): |
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97 for i in list(range(13)) + [31, 47, 62, 63, 64, 72]: |
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98 G = nx.random_graphs.gnm_random_graph(i, i * i // 4, seed=i) |
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99 f = BytesIO() |
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100 nx.write_graph6(G, f) |
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101 f.seek(0) |
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102 H = nx.read_graph6(f) |
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103 assert_nodes_equal(G.nodes(), H.nodes()) |
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104 assert_edges_equal(G.edges(), H.edges()) |
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105 |
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106 def test_write_path(self): |
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107 with tempfile.NamedTemporaryFile() as f: |
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108 g6.write_graph6_file(nx.null_graph(), f) |
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109 f.seek(0) |
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110 assert f.read() == b">>graph6<<?\n" |
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111 |
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112 def test_relabeling(self): |
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113 G = nx.Graph([(0, 1)]) |
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114 assert g6.to_graph6_bytes(G) == b">>graph6<<A_\n" |
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115 G = nx.Graph([(1, 2)]) |
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116 assert g6.to_graph6_bytes(G) == b">>graph6<<A_\n" |
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117 G = nx.Graph([(1, 42)]) |
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118 assert g6.to_graph6_bytes(G) == b">>graph6<<A_\n" |