119 lines
4.1 KiB
Python
119 lines
4.1 KiB
Python
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from io import BytesIO
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import tempfile
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import pytest
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import networkx as nx
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import networkx.readwrite.graph6 as g6
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from networkx.testing.utils import assert_edges_equal
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from networkx.testing.utils import assert_nodes_equal
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class TestGraph6Utils:
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def test_n_data_n_conversion(self):
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for i in [0, 1, 42, 62, 63, 64, 258047, 258048, 7744773, 68719476735]:
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assert g6.data_to_n(g6.n_to_data(i))[0] == i
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assert g6.data_to_n(g6.n_to_data(i))[1] == []
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assert g6.data_to_n(g6.n_to_data(i) + [42, 43])[1] == [42, 43]
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class TestFromGraph6Bytes:
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def test_from_graph6_bytes(self):
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data = b"DF{"
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G = nx.from_graph6_bytes(data)
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assert_nodes_equal(G.nodes(), [0, 1, 2, 3, 4])
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assert_edges_equal(
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G.edges(), [(0, 3), (0, 4), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)]
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)
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def test_read_equals_from_bytes(self):
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data = b"DF{"
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G = nx.from_graph6_bytes(data)
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fh = BytesIO(data)
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Gin = nx.read_graph6(fh)
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assert_nodes_equal(G.nodes(), Gin.nodes())
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assert_edges_equal(G.edges(), Gin.edges())
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class TestReadGraph6:
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def test_read_many_graph6(self):
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"""Test for reading many graphs from a file into a list."""
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data = b"DF{\nD`{\nDqK\nD~{\n"
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fh = BytesIO(data)
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glist = nx.read_graph6(fh)
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assert len(glist) == 4
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for G in glist:
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assert sorted(G) == list(range(5))
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class TestWriteGraph6:
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"""Unit tests for writing a graph to a file in graph6 format."""
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def test_null_graph(self):
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result = BytesIO()
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nx.write_graph6(nx.null_graph(), result)
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assert result.getvalue() == b">>graph6<<?\n"
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def test_trivial_graph(self):
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result = BytesIO()
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nx.write_graph6(nx.trivial_graph(), result)
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assert result.getvalue() == b">>graph6<<@\n"
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def test_complete_graph(self):
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result = BytesIO()
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nx.write_graph6(nx.complete_graph(4), result)
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assert result.getvalue() == b">>graph6<<C~\n"
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def test_large_complete_graph(self):
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result = BytesIO()
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nx.write_graph6(nx.complete_graph(67), result, header=False)
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assert result.getvalue() == b"~?@B" + b"~" * 368 + b"w\n"
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def test_no_header(self):
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result = BytesIO()
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nx.write_graph6(nx.complete_graph(4), result, header=False)
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assert result.getvalue() == b"C~\n"
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def test_complete_bipartite_graph(self):
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result = BytesIO()
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G = nx.complete_bipartite_graph(6, 9)
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nx.write_graph6(G, result, header=False)
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# The expected encoding here was verified by Sage.
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assert result.getvalue() == b"N??F~z{~Fw^_~?~?^_?\n"
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def test_no_directed_graphs(self):
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with pytest.raises(nx.NetworkXNotImplemented):
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nx.write_graph6(nx.DiGraph(), BytesIO())
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def test_length(self):
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for i in list(range(13)) + [31, 47, 62, 63, 64, 72]:
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g = nx.random_graphs.gnm_random_graph(i, i * i // 4, seed=i)
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gstr = BytesIO()
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nx.write_graph6(g, gstr, header=False)
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# Strip the trailing newline.
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gstr = gstr.getvalue().rstrip()
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assert len(gstr) == ((i - 1) * i // 2 + 5) // 6 + (1 if i < 63 else 4)
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def test_roundtrip(self):
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for i in list(range(13)) + [31, 47, 62, 63, 64, 72]:
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G = nx.random_graphs.gnm_random_graph(i, i * i // 4, seed=i)
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f = BytesIO()
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nx.write_graph6(G, f)
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f.seek(0)
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H = nx.read_graph6(f)
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assert_nodes_equal(G.nodes(), H.nodes())
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assert_edges_equal(G.edges(), H.edges())
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def test_write_path(self):
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with tempfile.NamedTemporaryFile() as f:
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g6.write_graph6_file(nx.null_graph(), f)
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f.seek(0)
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assert f.read() == b">>graph6<<?\n"
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def test_relabeling(self):
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G = nx.Graph([(0, 1)])
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assert g6.to_graph6_bytes(G) == b">>graph6<<A_\n"
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G = nx.Graph([(1, 2)])
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assert g6.to_graph6_bytes(G) == b">>graph6<<A_\n"
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G = nx.Graph([(1, 42)])
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assert g6.to_graph6_bytes(G) == b">>graph6<<A_\n"
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