test_ok2/doc/en/example/multipython.py

73 lines
2.0 KiB
Python

"""
module containing a parametrized tests testing cross-python
serialization via the pickle module.
"""
import shutil
import subprocess
import textwrap
import pytest
pythonlist = ["python3.5", "python3.6", "python3.7"]
@pytest.fixture(params=pythonlist)
def python1(request, tmpdir):
picklefile = tmpdir.join("data.pickle")
return Python(request.param, picklefile)
@pytest.fixture(params=pythonlist)
def python2(request, python1):
return Python(request.param, python1.picklefile)
class Python:
def __init__(self, version, picklefile):
self.pythonpath = shutil.which(version)
if not self.pythonpath:
pytest.skip("{!r} not found".format(version))
self.picklefile = picklefile
def dumps(self, obj):
dumpfile = self.picklefile.dirpath("dump.py")
dumpfile.write(
textwrap.dedent(
r"""
import pickle
f = open({!r}, 'wb')
s = pickle.dump({!r}, f, protocol=2)
f.close()
""".format(
str(self.picklefile), obj
)
)
)
subprocess.check_call((self.pythonpath, str(dumpfile)))
def load_and_is_true(self, expression):
loadfile = self.picklefile.dirpath("load.py")
loadfile.write(
textwrap.dedent(
r"""
import pickle
f = open({!r}, 'rb')
obj = pickle.load(f)
f.close()
res = eval({!r})
if not res:
raise SystemExit(1)
""".format(
str(self.picklefile), expression
)
)
)
print(loadfile)
subprocess.check_call((self.pythonpath, str(loadfile)))
@pytest.mark.parametrize("obj", [42, {}, {1: 3}])
def test_basic_objects(python1, python2, obj):
python1.dumps(obj)
python2.load_and_is_true("obj == {}".format(obj))