# -*- coding: utf-8 -*-
import errno
import os
import re
from matplotlib import use as mpl_use
mpl_use("Agg") # noqa: E402
from matplotlib import pyplot as mpl_plt
import pytest
def mkdir_p(path):
try:
os.makedirs(path)
except OSError as exc:
if exc.errno == errno.EEXIST and os.path.isdir(path):
pass
else: # pragma: no cover
raise
def pytest_addoption(parser):
parser.addoption(
"--plots",
nargs="?",
default=False,
const=True,
help="Save plots (can optionally specify a directory for plots).",
)
@pytest.hookimpl(hookwrapper=True)
def pytest_report_teststatus(report):
outcome = yield
category, shortletter, word = outcome.get_result()
word = "PASSED" if word == "" else word
if report.when == "teardown":
for key, val in report.user_properties:
if key == "plt_saved":
outcome.force_result(
(category, shortletter, "%s\n└─ Saved %r" % (word, val))
)
break
class Mock:
def __init__(self, *args, **kwargs):
pass
def __call__(self, *args, **kwargs):
return Mock()
def __getitem__(self, key):
return Mock()
def __iter__(self):
return iter([])
def __mul__(self, other):
return 1.0
@classmethod
def __getattr__(cls, name):
if name in ("__file__", "__path__"):
return "/dev/null"
elif name[0] == name[0].upper():
mockType = type(name, (), {})
mockType.__module__ = __name__
return mockType
else:
return Mock()
class Recorder:
def __init__(self, dirname, nodeid, filename_drop=None):
self.dirname = dirname
self.nodeid = nodeid
self.saved = None
self.filename_drop = [] if filename_drop is None else filename_drop
@property
def record(self):
return self.dirname is not None
@property
def dirname(self):
return self._dirname
@dirname.setter
def dirname(self, _dirname):
if _dirname is not None:
_dirname = os.path.normpath(_dirname)
if not os.path.exists(_dirname):
os.makedirs(_dirname)
self._dirname = _dirname
def get_filename(self, ext=""):
# Flatten filestructure (replace folders with dots in filename).
# The nodeid should only contain /, but to be safe we also replace \\.
# We also replace : with - because Windows does not allow colons in filenames.
filename = self.nodeid.replace("/", ".").replace("\\", ".").replace(":", "-")
# Drop parts of filename matching the given regexs
for pattern in self.filename_drop:
match = re.search(pattern, filename)
while match is not None:
span = match.span()
filename = filename[: span[0]] + filename[span[1] :]
match = re.search(pattern, filename)
return "%s.%s" % (filename, ext)
def __enter__(self):
raise NotImplementedError()
def __exit__(self, type, value, traceback):
raise NotImplementedError()
def save(self, path):
self.saved = path
class Plotter(Recorder):
def __enter__(self):
if self.record:
self.plt = mpl_plt
else:
self.plt = Mock()
self.plt.saveas = self.get_filename(ext="pdf")
return self.plt
def __exit__(self, type, value, traceback):
if self.record:
if self.plt.saveas is None:
del self.plt.saveas
self.plt.close("all")
return
if len(self.plt.gcf().get_axes()) > 0:
# tight_layout errors if no axes are present
self.plt.tight_layout()
self.save(os.path.join(self.dirname, self.plt.saveas))
self.plt.close("all")
def save(self, path):
mkdir_p(os.path.dirname(path))
savefig_kw = {"bbox_inches": "tight"}
if hasattr(self.plt, "bbox_extra_artists"):
savefig_kw["bbox_extra_artists"] = self.plt.bbox_extra_artists
self.plt.savefig(path, **savefig_kw)
super(Plotter, self).save(path)
[docs]@pytest.fixture
def plt(request):
"""A pyplot-compatible plotting interface.
Use this to create plots in your tests using the ``matplotlib.pyplot``
interface.
This will keep saved plots organized in a simulator-specific folder,
with an automatically generated name. ``savefig()`` and ``close()`` will
automatically be called when the test function completes.
If you need to override the default filename, set ``plt.saveas`` to
the desired filename. Be sure to include a file extension, as it will
be used as is.
"""
# Read plt_filename_drop from .ini config file
filename_drop = request.config.inicfg.get("plt_filename_drop", "")
filename_drop = [s for s in filename_drop.split("\n") if len(s) > 0]
# Read plt_dirname from .ini config file
default_dirname = request.config.inicfg.get("plt_dirname", "plots")
# Read dirname from command line, which takes precedence over .ini config
dirname = request.config.getvalue("plots")
if not isinstance(dirname, str) and dirname:
dirname = default_dirname
elif not dirname:
dirname = None # --plots argument not provided, so disable plots
plotter = Plotter(dirname, request.node.nodeid, filename_drop=filename_drop)
def _finalize():
plotter.__exit__(None, None, None)
if plotter.saved is not None:
request.node.user_properties.append(("plt_saved", plotter.saved))
request.addfinalizer(_finalize)
return plotter.__enter__()
