1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
import pytest
import matplotlib
from matplotlib import cbook
def pytest_configure(config):
matplotlib.use('agg', force=True)
matplotlib._called_from_pytest = True
matplotlib._init_tests()
def pytest_unconfigure(config):
matplotlib._called_from_pytest = False
@pytest.fixture(autouse=True)
def mpl_test_settings(request):
from matplotlib.testing.decorators import _cleanup_cm
with _cleanup_cm():
backend = None
backend_marker = request.node.get_closest_marker('backend')
if backend_marker is not None:
assert len(backend_marker.args) == 1, \
"Marker 'backend' must specify 1 backend."
backend, = backend_marker.args
prev_backend = matplotlib.get_backend()
style = '_classic_test' # Default of cleanup and image_comparison too.
style_marker = request.node.get_closest_marker('style')
if style_marker is not None:
assert len(style_marker.args) == 1, \
"Marker 'style' must specify 1 style."
style, = style_marker.args
matplotlib.testing.setup()
if backend is not None:
# This import must come after setup() so it doesn't load the
# default backend prematurely.
import matplotlib.pyplot as plt
try:
plt.switch_backend(backend)
except ImportError as exc:
# Should only occur for the cairo backend tests, if neither
# pycairo nor cairocffi are installed.
if 'cairo' in backend.lower():
pytest.skip("Failed to switch to backend {} ({})."
.format(backend, exc))
else:
raise
with cbook._suppress_matplotlib_deprecation_warning():
matplotlib.style.use(style)
try:
yield
finally:
if backend is not None:
plt.switch_backend(prev_backend)
@pytest.fixture
def mpl_image_comparison_parameters(request, extension):
# This fixture is applied automatically by the image_comparison decorator.
#
# The sole purpose of this fixture is to provide an indirect method of
# obtaining parameters *without* modifying the decorated function
# signature. In this way, the function signature can stay the same and
# pytest won't get confused.
# We annotate the decorated function with any parameters captured by this
# fixture so that they can be used by the wrapper in image_comparison.
baseline_images, = request.node.get_closest_marker('baseline_images').args
if baseline_images is None:
# Allow baseline image list to be produced on the fly based on current
# parametrization.
baseline_images = request.getfixturevalue('baseline_images')
func = request.function
with cbook._setattr_cm(func.__wrapped__,
parameters=(baseline_images, extension)):
yield
@pytest.fixture
def pd():
"""Fixture to import and configure pandas."""
pd = pytest.importorskip('pandas')
try:
from pandas.plotting import (
deregister_matplotlib_converters as deregister)
deregister()
except ImportError:
pass
return pd