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from tempfile import TemporaryFile
import pygraphviz as pgv
import pytest
def test_drawing_error():
with pytest.raises(AttributeError):
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
d = A.draw()
def test_name_error():
with pytest.raises(ValueError):
A = pgv.AGraph(name="test graph")
A.draw("foo", prog="foo")
def test_drawing_no_error_with_no_layout():
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
d = A.draw(prog="nop")
A.string_nop()
def test_drawing_makes_file_handle():
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
with TemporaryFile() as fh:
A.draw(fh, format="png", prog="twopi")
assert fh.tell() > 0
with TemporaryFile() as fh:
A.draw(path=fh, prog="circo", format="png")
assert fh.tell() > 0
def test_drawing_makes_file_path(tmp_path):
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
out = tmp_path / "draw.png"
A.draw(out, format="png", prog="twopi")
assert out.is_file()
out2 = tmp_path / "draw.png"
A.draw(str(out2), format="png", prog="twopi")
assert out2.is_file()
def test_drawing_to_create_dot_string():
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
A.layout()
dot_rep = A.to_string()
assert "test graph" in dot_rep
assert "strict graph" in dot_rep
assert "pos" in dot_rep
assert "height" in dot_rep
assert "width" in dot_rep
assert "1 -- 2" in dot_rep
assert "2 -- 3" in dot_rep
assert "3 -- 4" in dot_rep
# unfortunately, the layout and dot outcomes vary
# with system and graphviz version. One example is
# shown here, the numbers can be very different.
expected = """strict graph "test graph" {
graph [bb="0,0,70.071,250.3"];
node [label="\\N"];
1 [height=0.5,
pos="27,18",
width=0.75];
2 [height=0.5,
pos="43.071,88.469",
width=0.75];
1 -- 2 [pos="31.139,36.148 33.557,46.75 36.596,60.077 39.002,70.627"];
3 [height=0.5,
pos="41.467,160.69",
width=0.75];
2 -- 3 [pos="42.666,106.69 42.423,117.64 42.115,131.52 41.872,142.47"];
4 [height=0.5,
pos="32.966,232.3",
width=0.75];
3 -- 4 [pos="39.322,178.76 38.043,189.53 36.424,203.17 35.14,213.98"];
}
"""
# print("dot representation:", dot_rep)
# assert expected == dot_rep
class TestExperimentalGraphvizLibInterface:
def test_drawing_error(self):
with pytest.raises(AttributeError):
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
d = A._draw()
def test_name_error(self):
with pytest.raises(ValueError):
A = pgv.AGraph(name="test graph")
A._draw("foo", prog="foo")
def test_drawing_no_error_with_no_layout(self):
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
d = A._draw(prog="nop")
A.string_nop()
def test_drawing_png_output_with_NULL_smoketest(self):
"""The PNG format can contain NULL bytes, which can cause cstring
allocation problems if the size isn't handled correctly. See gh-424.
"""
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
d = A._draw(prog="dot", format="png")
def test_drawing_to_create_dot_string(self):
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
A._layout()
dot_rep = A.to_string()
assert "test graph" in dot_rep
assert "strict graph" in dot_rep
assert "pos" in dot_rep
assert "height" in dot_rep
assert "width" in dot_rep
assert "1 -- 2" in dot_rep
assert "2 -- 3" in dot_rep
assert "3 -- 4" in dot_rep
# unfortunately, the layout and dot outcomes vary
# with system and graphviz version. One example is
# shown here, the numbers can be very different.
expected = """strict graph "test graph" {
graph [bb="0,0,70.071,250.3"];
node [label="\\N"];
1 [height=0.5,
pos="27,18",
width=0.75];
2 [height=0.5,
pos="43.071,88.469",
width=0.75];
1 -- 2 [pos="31.139,36.148 33.557,46.75 36.596,60.077 39.002,70.627"];
3 [height=0.5,
pos="41.467,160.69",
width=0.75];
2 -- 3 [pos="42.666,106.69 42.423,117.64 42.115,131.52 41.872,142.47"];
4 [height=0.5,
pos="32.966,232.3",
width=0.75];
3 -- 4 [pos="39.322,178.76 38.043,189.53 36.424,203.17 35.14,213.98"];
}
"""
# print("dot representation:", dot_rep)
# assert expected == dot_rep
def test_drawing_makes_file(self):
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
with TemporaryFile() as fh:
A._draw(fh, format="png", prog="twopi")
assert fh.tell() > 0
def test_drawing_makes_file1(self):
A = pgv.AGraph(name="test graph")
A.add_path([1, 2, 3, 4])
with TemporaryFile() as fh:
A._draw(path=fh, prog="circo", format="png")
assert fh.tell() > 0
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