test_basic.py
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import builtins
import os
import subprocess
import sys
import textwrap
def test_simple():
assert 1 + 1 == 2
def test_override_builtins():
import pylab
ok_to_override = {
'__name__',
'__doc__',
'__package__',
'__loader__',
'__spec__',
'any',
'all',
'sum',
'divmod'
}
overridden = False
for key in dir(pylab):
if key in dir(builtins):
if (getattr(pylab, key) != getattr(builtins, key) and
key not in ok_to_override):
print("'%s' was overridden in globals()." % key)
overridden = True
assert not overridden
def test_lazy_imports():
source = textwrap.dedent("""
import sys
import matplotlib.figure
import matplotlib.backend_bases
import matplotlib.pyplot
assert 'matplotlib._tri' not in sys.modules
assert 'matplotlib._qhull' not in sys.modules
assert 'matplotlib._contour' not in sys.modules
assert 'urllib.request' not in sys.modules
""")
subprocess.check_call(
[sys.executable, '-c', source],
env={**os.environ, "MPLBACKEND": "", "MATPLOTLIBRC": os.devnull})