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+"""Unit tests for PyGraphviz interface."""
+
+import warnings
+
+import pytest
+
+pygraphviz = pytest.importorskip("pygraphviz")
+
+
+import networkx as nx
+from networkx.utils import edges_equal, graphs_equal, nodes_equal
+
+
+class TestAGraph:
+ def build_graph(self, G):
+ edges = [("A", "B"), ("A", "C"), ("A", "C"), ("B", "C"), ("A", "D")]
+ G.add_edges_from(edges)
+ G.add_node("E")
+ G.graph["metal"] = "bronze"
+ return G
+
+ def assert_equal(self, G1, G2):
+ assert nodes_equal(G1.nodes(), G2.nodes())
+ assert edges_equal(G1.edges(), G2.edges())
+ assert G1.graph["metal"] == G2.graph["metal"]
+
+ @pytest.mark.parametrize(
+ "G", (nx.Graph(), nx.DiGraph(), nx.MultiGraph(), nx.MultiDiGraph())
+ )
+ def test_agraph_roundtripping(self, G, tmp_path):
+ G = self.build_graph(G)
+ A = nx.nx_agraph.to_agraph(G)
+ H = nx.nx_agraph.from_agraph(A)
+ self.assert_equal(G, H)
+
+ fname = tmp_path / "test.dot"
+ nx.drawing.nx_agraph.write_dot(H, fname)
+ Hin = nx.nx_agraph.read_dot(fname)
+ self.assert_equal(H, Hin)
+
+ fname = tmp_path / "fh_test.dot"
+ with open(fname, "w") as fh:
+ nx.drawing.nx_agraph.write_dot(H, fh)
+
+ with open(fname) as fh:
+ Hin = nx.nx_agraph.read_dot(fh)
+ self.assert_equal(H, Hin)
+
+ def test_from_agraph_name(self):
+ G = nx.Graph(name="test")
+ A = nx.nx_agraph.to_agraph(G)
+ H = nx.nx_agraph.from_agraph(A)
+ assert G.name == "test"
+
+ @pytest.mark.parametrize(
+ "graph_class", (nx.Graph, nx.DiGraph, nx.MultiGraph, nx.MultiDiGraph)
+ )
+ def test_from_agraph_create_using(self, graph_class):
+ G = nx.path_graph(3)
+ A = nx.nx_agraph.to_agraph(G)
+ H = nx.nx_agraph.from_agraph(A, create_using=graph_class)
+ assert isinstance(H, graph_class)
+
+ def test_from_agraph_named_edges(self):
+ # Create an AGraph from an existing (non-multi) Graph
+ G = nx.Graph()
+ G.add_nodes_from([0, 1])
+ A = nx.nx_agraph.to_agraph(G)
+ # Add edge (+ name, given by key) to the AGraph
+ A.add_edge(0, 1, key="foo")
+ # Verify a.name roundtrips out to 'key' in from_agraph
+ H = nx.nx_agraph.from_agraph(A)
+ assert isinstance(H, nx.Graph)
+ assert ("0", "1", {"key": "foo"}) in H.edges(data=True)
+
+ def test_to_agraph_with_nodedata(self):
+ G = nx.Graph()
+ G.add_node(1, color="red")
+ A = nx.nx_agraph.to_agraph(G)
+ assert dict(A.nodes()[0].attr) == {"color": "red"}
+
+ @pytest.mark.parametrize("graph_class", (nx.Graph, nx.MultiGraph))
+ def test_to_agraph_with_edgedata(self, graph_class):
+ G = graph_class()
+ G.add_nodes_from([0, 1])
+ G.add_edge(0, 1, color="yellow")
+ A = nx.nx_agraph.to_agraph(G)
+ assert dict(A.edges()[0].attr) == {"color": "yellow"}
+
+ def test_view_pygraphviz_path(self, tmp_path):
+ G = nx.complete_graph(3)
+ input_path = str(tmp_path / "graph.png")
+ out_path, A = nx.nx_agraph.view_pygraphviz(G, path=input_path, show=False)
+ assert out_path == input_path
+ # Ensure file is not empty
+ with open(input_path, "rb") as fh:
+ data = fh.read()
+ assert len(data) > 0
+
+ def test_view_pygraphviz_file_suffix(self, tmp_path):
+ G = nx.complete_graph(3)
+ path, A = nx.nx_agraph.view_pygraphviz(G, suffix=1, show=False)
+ assert path[-6:] == "_1.png"
+
+ def test_view_pygraphviz(self):
+ G = nx.Graph() # "An empty graph cannot be drawn."
+ pytest.raises(nx.NetworkXException, nx.nx_agraph.view_pygraphviz, G)
+ G = nx.barbell_graph(4, 6)
+ nx.nx_agraph.view_pygraphviz(G, show=False)
+
+ def test_view_pygraphviz_edgelabel(self):
+ G = nx.Graph()
+ G.add_edge(1, 2, weight=7)
+ G.add_edge(2, 3, weight=8)
+ path, A = nx.nx_agraph.view_pygraphviz(G, edgelabel="weight", show=False)
+ for edge in A.edges():
+ assert edge.attr["weight"] in ("7", "8")
+
+ def test_view_pygraphviz_callable_edgelabel(self):
+ G = nx.complete_graph(3)
+
+ def foo_label(data):
+ return "foo"
+
+ path, A = nx.nx_agraph.view_pygraphviz(G, edgelabel=foo_label, show=False)
+ for edge in A.edges():
+ assert edge.attr["label"] == "foo"
+
+ def test_view_pygraphviz_multigraph_edgelabels(self):
+ G = nx.MultiGraph()
+ G.add_edge(0, 1, key=0, name="left_fork")
+ G.add_edge(0, 1, key=1, name="right_fork")
+ path, A = nx.nx_agraph.view_pygraphviz(G, edgelabel="name", show=False)
+ edges = A.edges()
+ assert len(edges) == 2
+ for edge in edges:
+ assert edge.attr["label"].strip() in ("left_fork", "right_fork")
+
+ def test_graph_with_reserved_keywords(self):
+ # test attribute/keyword clash case for #1582
+ # node: n
+ # edges: u,v
+ G = nx.Graph()
+ G = self.build_graph(G)
+ G.nodes["E"]["n"] = "keyword"
+ G.edges[("A", "B")]["u"] = "keyword"
+ G.edges[("A", "B")]["v"] = "keyword"
+ A = nx.nx_agraph.to_agraph(G)
+
+ def test_view_pygraphviz_no_added_attrs_to_input(self):
+ G = nx.complete_graph(2)
+ path, A = nx.nx_agraph.view_pygraphviz(G, show=False)
+ assert G.graph == {}
+
+ @pytest.mark.xfail(reason="known bug in clean_attrs")
+ def test_view_pygraphviz_leaves_input_graph_unmodified(self):
+ G = nx.complete_graph(2)
+ # Add entries to graph dict that to_agraph handles specially
+ G.graph["node"] = {"width": "0.80"}
+ G.graph["edge"] = {"fontsize": "14"}
+ path, A = nx.nx_agraph.view_pygraphviz(G, show=False)
+ assert G.graph == {"node": {"width": "0.80"}, "edge": {"fontsize": "14"}}
+
+ def test_graph_with_AGraph_attrs(self):
+ G = nx.complete_graph(2)
+ # Add entries to graph dict that to_agraph handles specially
+ G.graph["node"] = {"width": "0.80"}
+ G.graph["edge"] = {"fontsize": "14"}
+ path, A = nx.nx_agraph.view_pygraphviz(G, show=False)
+ # Ensure user-specified values are not lost
+ assert dict(A.node_attr)["width"] == "0.80"
+ assert dict(A.edge_attr)["fontsize"] == "14"
+
+ def test_round_trip_empty_graph(self):
+ G = nx.Graph()
+ A = nx.nx_agraph.to_agraph(G)
+ H = nx.nx_agraph.from_agraph(A)
+ # assert graphs_equal(G, H)
+ AA = nx.nx_agraph.to_agraph(H)
+ HH = nx.nx_agraph.from_agraph(AA)
+ assert graphs_equal(H, HH)
+ G.graph["graph"] = {}
+ G.graph["node"] = {}
+ G.graph["edge"] = {}
+ assert graphs_equal(G, HH)
+
+ @pytest.mark.xfail(reason="integer->string node conversion in round trip")
+ def test_round_trip_integer_nodes(self):
+ G = nx.complete_graph(3)
+ A = nx.nx_agraph.to_agraph(G)
+ H = nx.nx_agraph.from_agraph(A)
+ assert graphs_equal(G, H)
+
+ def test_graphviz_alias(self):
+ G = self.build_graph(nx.Graph())
+ pos_graphviz = nx.nx_agraph.graphviz_layout(G)
+ pos_pygraphviz = nx.nx_agraph.pygraphviz_layout(G)
+ assert pos_graphviz == pos_pygraphviz
+
+ @pytest.mark.parametrize("root", range(5))
+ def test_pygraphviz_layout_root(self, root):
+ # NOTE: test depends on layout prog being deterministic
+ G = nx.complete_graph(5)
+ A = nx.nx_agraph.to_agraph(G)
+ # Get layout with root arg is not None
+ pygv_layout = nx.nx_agraph.pygraphviz_layout(G, prog="circo", root=root)
+ # Equivalent layout directly on AGraph
+ A.layout(args=f"-Groot={root}", prog="circo")
+ # Parse AGraph layout
+ a1_pos = tuple(float(v) for v in dict(A.get_node("1").attr)["pos"].split(","))
+ assert pygv_layout[1] == a1_pos
+
+ def test_2d_layout(self):
+ G = nx.Graph()
+ G = self.build_graph(G)
+ G.graph["dimen"] = 2
+ pos = nx.nx_agraph.pygraphviz_layout(G, prog="neato")
+ pos = list(pos.values())
+ assert len(pos) == 5
+ assert len(pos[0]) == 2
+
+ def test_3d_layout(self):
+ G = nx.Graph()
+ G = self.build_graph(G)
+ G.graph["dimen"] = 3
+ pos = nx.nx_agraph.pygraphviz_layout(G, prog="neato")
+ pos = list(pos.values())
+ assert len(pos) == 5
+ assert len(pos[0]) == 3
+
+ def test_no_warnings_raised(self):
+ # Test that no warnings are raised when Networkx graph
+ # is converted to Pygraphviz graph and 'pos'
+ # attribute is given
+ G = nx.Graph()
+ G.add_node(0, pos=(0, 0))
+ G.add_node(1, pos=(1, 1))
+ A = nx.nx_agraph.to_agraph(G)
+ with warnings.catch_warnings(record=True) as record:
+ A.layout()
+ assert len(record) == 0