black/tests/util.py
Sagi Shadur 407052724f
Switch to pytest and tox (#1763)
* Add venv to .gitignore

* Use tox to run tests

* Make fuzz run in tox

* Split tests files

* Fix import error
2020-10-19 10:35:26 -07:00

44 lines
1.4 KiB
Python

import unittest
from contextlib import contextmanager
from pathlib import Path
from typing import List, Tuple, Iterator
THIS_DIR = Path(__file__).parent
PROJECT_ROOT = THIS_DIR.parent
EMPTY_LINE = "# EMPTY LINE WITH WHITESPACE" + " (this comment will be removed)"
DETERMINISTIC_HEADER = "[Deterministic header]"
@contextmanager
def skip_if_exception(e: str) -> Iterator[None]:
try:
yield
except Exception as exc:
if exc.__class__.__name__ == e:
unittest.skip(f"Encountered expected exception {exc}, skipping")
else:
raise
def read_data(name: str, data: bool = True) -> Tuple[str, str]:
"""read_data('test_name') -> 'input', 'output'"""
if not name.endswith((".py", ".pyi", ".out", ".diff")):
name += ".py"
_input: List[str] = []
_output: List[str] = []
base_dir = THIS_DIR / "data" if data else PROJECT_ROOT
with open(base_dir / name, "r", encoding="utf8") as test:
lines = test.readlines()
result = _input
for line in lines:
line = line.replace(EMPTY_LINE, "")
if line.rstrip() == "# output":
result = _output
continue
result.append(line)
if _input and not _output:
# If there's no output marker, treat the entire file as already pre-formatted.
_output = _input[:]
return "".join(_input).strip() + "\n", "".join(_output).strip() + "\n"