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tractor/tests/test_docs_examples.py

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Python

"""
Let's make sure them docs work yah?
"""
from contextlib import contextmanager
import itertools
import os
import sys
import subprocess
import platform
import shutil
import pytest
def repodir():
"""Return the abspath to the repo directory.
"""
dirname = os.path.dirname
dirpath = os.path.abspath(
dirname(dirname(os.path.realpath(__file__)))
)
return dirpath
def examples_dir():
"""Return the abspath to the examples directory.
"""
return os.path.join(repodir(), 'examples')
@pytest.fixture
def run_example_in_subproc(loglevel, testdir, arb_addr):
@contextmanager
def run(script_code):
kwargs = dict()
if platform.system() == 'Windows':
# on windows we need to create a special __main__.py which will
# be executed with ``python -m <modulename>`` on windows..
shutil.copyfile(
os.path.join(examples_dir(), '__main__.py'),
os.path.join(str(testdir), '__main__.py')
)
# drop the ``if __name__ == '__main__'`` guard onwards from
# the *NIX version of each script
windows_script_lines = itertools.takewhile(
lambda line: "if __name__ ==" not in line,
script_code.splitlines()
)
script_code = '\n'.join(windows_script_lines)
script_file = testdir.makefile('.py', script_code)
# without this, tests hang on windows forever
kwargs['creationflags'] = subprocess.CREATE_NEW_PROCESS_GROUP
# run the testdir "libary module" as a script
cmdargs = [
sys.executable,
'-m',
# use the "module name" of this "package"
'test_example'
]
else:
script_file = testdir.makefile('.py', script_code)
cmdargs = [
sys.executable,
str(script_file),
]
proc = testdir.popen(
cmdargs,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
**kwargs,
)
assert not proc.returncode
yield proc
proc.wait()
assert proc.returncode == 0
yield run
@pytest.mark.parametrize(
'example_script',
[
f for f in os.listdir(examples_dir())
if (
('__' not in f) and
('debugging' not in f)
)
],
)
def test_example(run_example_in_subproc, example_script):
"""Load and run scripts from this repo's ``examples/`` dir as a user
would copy and pasing them into their editor.
On windows a little more "finessing" is done to make
``multiprocessing`` play nice: we copy the ``__main__.py`` into the
test directory and invoke the script as a module with ``python -m
test_example``.
"""
ex_file = os.path.join(examples_dir(), example_script)
with open(ex_file, 'r') as ex:
code = ex.read()
with run_example_in_subproc(code) as proc:
proc.wait()
err, _ = proc.stderr.read(), proc.stdout.read()
# if we get some gnarly output let's aggregate and raise
errmsg = err.decode()
errlines = errmsg.splitlines()
if err and 'Error' in errlines[-1]:
raise Exception(errmsg)
assert proc.returncode == 0