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mightyscape-1.1-deprecated/extensions/fablabchemnitz/networkx/drawing/tests/test_agraph.py

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2020-07-30 01:16:18 +02:00
"""Unit tests for PyGraphviz interface."""
import os
import tempfile
import pytest
import pytest
pygraphviz = pytest.importorskip('pygraphviz')
from networkx.testing import assert_edges_equal, assert_nodes_equal, \
assert_graphs_equal
import networkx as nx
class TestAGraph(object):
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']
def agraph_checks(self, G):
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 = tempfile.mktemp()
nx.drawing.nx_agraph.write_dot(H, fname)
Hin = nx.nx_agraph.read_dot(fname)
os.unlink(fname)
self.assert_equal(H, Hin)
(fd, fname) = tempfile.mkstemp()
with open(fname, 'w') as fh:
nx.drawing.nx_agraph.write_dot(H, fh)
with open(fname, 'r') as fh:
Hin = nx.nx_agraph.read_dot(fh)
os.unlink(fname)
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'
def test_undirected(self):
self.agraph_checks(nx.Graph())
def test_directed(self):
self.agraph_checks(nx.DiGraph())
def test_multi_undirected(self):
self.agraph_checks(nx.MultiGraph())
def test_multi_directed(self):
self.agraph_checks(nx.MultiDiGraph())
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)
def test_view_pygraphviz_edgelable(self):
G = nx.Graph()
G.add_edge(1, 2, weight=7)
G.add_edge(2, 3, weight=8)
nx.nx_agraph.view_pygraphviz(G, edgelabel='weight')
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_round_trip(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)
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