65abd1006b
Commit history before merge: * add context manager to temporarily change the cwd * Iterator, not Iterable
87 lines
2.7 KiB
Python
87 lines
2.7 KiB
Python
import os
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import unittest
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from pathlib import Path
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from typing import Iterator, List, Tuple, Any
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from contextlib import contextmanager
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from functools import partial
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import black
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from black.output import out, err
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from black.debug import DebugVisitor
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THIS_DIR = Path(__file__).parent
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PROJECT_ROOT = THIS_DIR.parent
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EMPTY_LINE = "# EMPTY LINE WITH WHITESPACE" + " (this comment will be removed)"
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DETERMINISTIC_HEADER = "[Deterministic header]"
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DEFAULT_MODE = black.Mode()
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ff = partial(black.format_file_in_place, mode=DEFAULT_MODE, fast=True)
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fs = partial(black.format_str, mode=DEFAULT_MODE)
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def dump_to_stderr(*output: str) -> str:
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return "\n" + "\n".join(output) + "\n"
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class BlackBaseTestCase(unittest.TestCase):
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maxDiff = None
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_diffThreshold = 2 ** 20
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def assertFormatEqual(self, expected: str, actual: str) -> None:
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if actual != expected and not os.environ.get("SKIP_AST_PRINT"):
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bdv: DebugVisitor[Any]
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out("Expected tree:", fg="green")
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try:
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exp_node = black.lib2to3_parse(expected)
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bdv = DebugVisitor()
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list(bdv.visit(exp_node))
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except Exception as ve:
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err(str(ve))
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out("Actual tree:", fg="red")
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try:
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exp_node = black.lib2to3_parse(actual)
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bdv = DebugVisitor()
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list(bdv.visit(exp_node))
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except Exception as ve:
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err(str(ve))
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self.assertMultiLineEqual(expected, actual)
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def read_data(name: str, data: bool = True) -> Tuple[str, str]:
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"""read_data('test_name') -> 'input', 'output'"""
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if not name.endswith((".py", ".pyi", ".out", ".diff")):
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name += ".py"
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base_dir = THIS_DIR / "data" if data else PROJECT_ROOT
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return read_data_from_file(base_dir / name)
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def read_data_from_file(file_name: Path) -> Tuple[str, str]:
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with open(file_name, "r", encoding="utf8") as test:
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lines = test.readlines()
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_input: List[str] = []
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_output: List[str] = []
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result = _input
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for line in lines:
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line = line.replace(EMPTY_LINE, "")
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if line.rstrip() == "# output":
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result = _output
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continue
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result.append(line)
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if _input and not _output:
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# If there's no output marker, treat the entire file as already pre-formatted.
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_output = _input[:]
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return "".join(_input).strip() + "\n", "".join(_output).strip() + "\n"
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@contextmanager
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def change_directory(path: Path) -> Iterator[None]:
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"""Context manager to temporarily chdir to a different directory."""
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previous_dir = os.getcwd()
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try:
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os.chdir(path)
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yield
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finally:
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os.chdir(previous_dir)
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