/
__init__.py
115 lines (95 loc) · 3.16 KB
/
__init__.py
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"""
Helper functions for testing.
"""
from pathlib import Path
from tempfile import TemporaryDirectory
import locale
import logging
import os
import subprocess
import sys
import matplotlib as mpl
from matplotlib import _api
_log = logging.getLogger(__name__)
def set_font_settings_for_testing():
mpl.rcParams['font.family'] = 'DejaVu Sans'
mpl.rcParams['text.hinting'] = 'none'
mpl.rcParams['text.hinting_factor'] = 8
def set_reproducibility_for_testing():
mpl.rcParams['svg.hashsalt'] = 'matplotlib'
def setup():
# The baseline images are created in this locale, so we should use
# it during all of the tests.
try:
locale.setlocale(locale.LC_ALL, 'en_US.UTF-8')
except locale.Error:
try:
locale.setlocale(locale.LC_ALL, 'English_United States.1252')
except locale.Error:
_log.warning(
"Could not set locale to English/United States. "
"Some date-related tests may fail.")
mpl.use('Agg')
with _api.suppress_matplotlib_deprecation_warning():
mpl.rcdefaults() # Start with all defaults
# These settings *must* be hardcoded for running the comparison tests and
# are not necessarily the default values as specified in rcsetup.py.
set_font_settings_for_testing()
set_reproducibility_for_testing()
def subprocess_run_helper(func, *args, timeout, extra_env=None):
"""
Run a function in a sub-process.
Parameters
----------
func : function
The function to be run. It must be in a module that is importable.
*args : str
Any additional command line arguments to be passed in
the first argument to ``subprocess.run``.
extra_env : dict[str, str]
Any additional environment variables to be set for the subprocess.
"""
target = func.__name__
module = func.__module__
proc = subprocess.run(
[sys.executable,
"-c",
f"from {module} import {target}; {target}()",
*args],
env={**os.environ, "SOURCE_DATE_EPOCH": "0", **(extra_env or {})},
timeout=timeout, check=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True)
return proc
def _check_for_pgf(texsystem):
"""
Check if a given TeX system + pgf is available
Parameters
----------
texsystem : str
The executable name to check
"""
with TemporaryDirectory() as tmpdir:
tex_path = Path(tmpdir, "test.tex")
tex_path.write_text(r"""
\documentclass{article}
\usepackage{pgf}
\begin{document}
\typeout{pgfversion=\pgfversion}
\makeatletter
\@@end
""", encoding="utf-8")
try:
subprocess.check_call(
[texsystem, "-halt-on-error", str(tex_path)], cwd=tmpdir,
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
except (OSError, subprocess.CalledProcessError):
return False
return True
def _has_tex_package(package):
try:
mpl.dviread._find_tex_file(f"{package}.sty")
return True
except FileNotFoundError:
return False