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Merge pull request #1419 from PyCQA/issue/1393/add-property-based-tes…
…ting-of-complex-code-snippet Issue/1393/add property based testing of complex code snippet
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from typing import get_type_hints | ||
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import hypothesis | ||
from hypothesis import strategies as st | ||
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import isort | ||
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def _as_config(kw) -> isort.Config: | ||
kw["atomic"] = False | ||
if "wrap_length" in kw and "line_length" in kw: | ||
kw["wrap_length"], kw["line_length"] = sorted([kw["wrap_length"], kw["line_length"]]) | ||
try: | ||
return isort.Config(**kw) | ||
except ValueError: | ||
kw["wrap_length"] = 0 | ||
return isort.Config(**kw) | ||
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def configs() -> st.SearchStrategy[isort.Config]: | ||
"""Generate arbitrary Config objects.""" | ||
skip = { | ||
"line_ending", | ||
"sections", | ||
"known_standard_library", | ||
"known_future_library", | ||
"known_third_party", | ||
"known_first_party", | ||
"known_local_folder", | ||
"extra_standard_library", | ||
"forced_separate", | ||
"lines_after_imports", | ||
"add_imports", | ||
"lines_between_sections", | ||
"lines_between_types", | ||
"sources", | ||
"virtual_env", | ||
"conda_env", | ||
"directory", | ||
"formatter", | ||
"formatting_function", | ||
"comment_prefix", | ||
"atomic", | ||
"skip", | ||
"src_paths", | ||
} | ||
inferred_kwargs = { | ||
k: st.from_type(v) | ||
for k, v in get_type_hints(isort.settings._Config).items() | ||
if k not in skip | ||
} | ||
specific = { | ||
"line_length": st.integers(0, 200), | ||
"wrap_length": st.integers(0, 200), | ||
"indent": st.integers(0, 20).map(lambda n: n * " "), | ||
"default_section": st.sampled_from(sorted(isort.settings.KNOWN_SECTION_MAPPING)), | ||
"force_grid_wrap": st.integers(0, 20), | ||
"profile": st.sampled_from(sorted(isort.settings.profiles)), | ||
"py_version": st.sampled_from(("auto",) + isort.settings.VALID_PY_TARGETS), | ||
} | ||
kwargs = {**inferred_kwargs, **specific} | ||
return st.fixed_dictionaries({}, optional=kwargs).map(_as_config) | ||
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st.register_type_strategy(isort.Config, configs()) | ||
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CODE_SNIPPET = """ | ||
'''Taken from bottle.py | ||
Copyright (c) 2009-2018, Marcel Hellkamp. | ||
License: MIT (see LICENSE for details) | ||
''' | ||
# Lots of stdlib and builtin differences. | ||
if py3k: | ||
import http.client as httplib | ||
import _thread as thread | ||
from urllib.parse import urljoin, SplitResult as UrlSplitResult | ||
from urllib.parse import urlencode, quote as urlquote, unquote as urlunquote | ||
urlunquote = functools.partial(urlunquote, encoding='latin1') | ||
from http.cookies import SimpleCookie, Morsel, CookieError | ||
from collections.abc import MutableMapping as DictMixin | ||
import pickle # comment number 2 | ||
from io import BytesIO | ||
import configparser | ||
basestring = str | ||
unicode = str | ||
json_loads = lambda s: json_lds(touni(s)) | ||
callable = lambda x: hasattr(x, '__call__') | ||
imap = map | ||
def _raise(*a): | ||
raise a[0](a[1]).with_traceback(a[2]) | ||
else: # 2.x | ||
import httplib | ||
import thread | ||
from urlparse import urljoin, SplitResult as UrlSplitResult | ||
from urllib import urlencode, quote as urlquote, unquote as urlunquote | ||
from Cookie import SimpleCookie, Morsel, CookieError | ||
from itertools import imap | ||
import cPickle as pickle | ||
from StringIO import StringIO as BytesIO | ||
import ConfigParser as configparser # commentnumberone | ||
from collections import MutableMapping as DictMixin | ||
unicode = unicode | ||
json_loads = json_lds | ||
exec(compile('def _raise(*a): raise a[0], a[1], a[2]', '<py3fix>', 'exec')) | ||
""" | ||
SHOULD_RETAIN = [ | ||
"""'''Taken from bottle.py | ||
Copyright (c) 2009-2018, Marcel Hellkamp. | ||
License: MIT (see LICENSE for details) | ||
'''""", | ||
"# Lots of stdlib and builtin differences.", | ||
"if py3k:", | ||
"http.client", | ||
"_thread", | ||
"urllib.parse", | ||
"urlencode", | ||
"urlunquote = functools.partial(urlunquote, encoding='latin1')", | ||
"http.cookies", | ||
"SimpleCookie", | ||
"collections.abc", | ||
"pickle", | ||
"comment number 2", | ||
"io", | ||
"configparser", | ||
"""basestring = str | ||
unicode = str | ||
json_loads = lambda s: json_lds(touni(s)) | ||
callable = lambda x: hasattr(x, '__call__') | ||
imap = map | ||
def _raise(*a): | ||
raise a[0](a[1]).with_traceback(a[2]) | ||
else: # 2.x | ||
""", | ||
"httplib", | ||
"thread", | ||
"urlparse", | ||
"urllib", | ||
"Cookie", | ||
"itertools", | ||
"cPickle", | ||
"StringIO", | ||
"ConfigParser", | ||
"commentnumberone", | ||
"collections", | ||
"""unicode = unicode | ||
json_loads = json_lds | ||
exec(compile('def _raise(*a): raise a[0], a[1], a[2]', '<py3fix>', 'exec'))""", | ||
] | ||
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@hypothesis.given( | ||
config=st.from_type(isort.Config), disregard_skip=st.booleans(), | ||
) | ||
def test_isort_is_idempotent(config: isort.Config, disregard_skip: bool) -> None: | ||
try: | ||
result = isort.code(CODE_SNIPPET, config=config, disregard_skip=disregard_skip) | ||
result = isort.code(result, config=config, disregard_skip=disregard_skip) | ||
assert result == isort.code(result, config=config, disregard_skip=disregard_skip) | ||
except ValueError: | ||
pass | ||
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@hypothesis.given( | ||
config=st.from_type(isort.Config), disregard_skip=st.booleans(), | ||
) | ||
def test_isort_doesnt_lose_imports_or_comments(config: isort.Config, disregard_skip: bool) -> None: | ||
result = isort.code(CODE_SNIPPET, config=config, disregard_skip=disregard_skip) | ||
for should_be_retained in SHOULD_RETAIN: | ||
if should_be_retained not in result: | ||
if config.ignore_comments and should_be_retained.startswith("comment"): | ||
continue | ||
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assert should_be_retained in result |