X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/407052724fa1c97ee8bcd4e96de650def00be03e..9b2b048692f0bd642f38230b4e61c778a4653f91:/tests/util.py diff --git a/tests/util.py b/tests/util.py index 9c3d3cb..967d576 100644 --- a/tests/util.py +++ b/tests/util.py @@ -1,34 +1,179 @@ +import os +import sys import unittest from contextlib import contextmanager +from dataclasses import replace +from functools import partial from pathlib import Path -from typing import List, Tuple, Iterator +from typing import Any, Iterator, List, Optional, Tuple + +import black +from black.debug import DebugVisitor +from black.mode import TargetVersion +from black.output import diff, err, out + +PYTHON_SUFFIX = ".py" +ALLOWED_SUFFIXES = (PYTHON_SUFFIX, ".pyi", ".out", ".diff", ".ipynb") THIS_DIR = Path(__file__).parent +DATA_DIR = THIS_DIR / "data" PROJECT_ROOT = THIS_DIR.parent EMPTY_LINE = "# EMPTY LINE WITH WHITESPACE" + " (this comment will be removed)" DETERMINISTIC_HEADER = "[Deterministic header]" +PY36_VERSIONS = { + TargetVersion.PY36, + TargetVersion.PY37, + TargetVersion.PY38, + TargetVersion.PY39, +} -@contextmanager -def skip_if_exception(e: str) -> Iterator[None]: +DEFAULT_MODE = black.Mode() +ff = partial(black.format_file_in_place, mode=DEFAULT_MODE, fast=True) +fs = partial(black.format_str, mode=DEFAULT_MODE) + + +def _assert_format_equal(expected: str, actual: str) -> None: + if actual != expected and not os.environ.get("SKIP_AST_PRINT"): + bdv: DebugVisitor[Any] + out("Expected tree:", fg="green") + try: + exp_node = black.lib2to3_parse(expected) + bdv = DebugVisitor() + list(bdv.visit(exp_node)) + except Exception as ve: + err(str(ve)) + out("Actual tree:", fg="red") + try: + exp_node = black.lib2to3_parse(actual) + bdv = DebugVisitor() + list(bdv.visit(exp_node)) + except Exception as ve: + err(str(ve)) + + if actual != expected: + out(diff(expected, actual, "expected", "actual")) + + assert actual == expected + + +class FormatFailure(Exception): + """Used to wrap failures when assert_format() runs in an extra mode.""" + + +def assert_format( + source: str, + expected: str, + mode: black.Mode = DEFAULT_MODE, + *, + fast: bool = False, + minimum_version: Optional[Tuple[int, int]] = None, +) -> None: + """Convenience function to check that Black formats as expected. + + You can pass @minimum_version if you're passing code with newer syntax to guard + safety guards so they don't just crash with a SyntaxError. Please note this is + separate from TargetVerson Mode configuration. + """ + _assert_format_inner( + source, expected, mode, fast=fast, minimum_version=minimum_version + ) + + # For both preview and non-preview tests, ensure that Black doesn't crash on + # this code, but don't pass "expected" because the precise output may differ. try: - yield - except Exception as exc: - if exc.__class__.__name__ == e: - unittest.skip(f"Encountered expected exception {exc}, skipping") - else: - raise + _assert_format_inner( + source, + None, + replace(mode, preview=not mode.preview), + fast=fast, + minimum_version=minimum_version, + ) + except Exception as e: + text = "non-preview" if mode.preview else "preview" + raise FormatFailure( + f"Black crashed formatting this case in {text} mode." + ) from e + # Similarly, setting line length to 1 is a good way to catch + # stability bugs. But only in non-preview mode because preview mode + # currently has a lot of line length 1 bugs. + try: + _assert_format_inner( + source, + None, + replace(mode, preview=False, line_length=1), + fast=fast, + minimum_version=minimum_version, + ) + except Exception as e: + raise FormatFailure( + "Black crashed formatting this case with line-length set to 1." + ) from e + + +def _assert_format_inner( + source: str, + expected: Optional[str] = None, + mode: black.Mode = DEFAULT_MODE, + *, + fast: bool = False, + minimum_version: Optional[Tuple[int, int]] = None, +) -> None: + actual = black.format_str(source, mode=mode) + if expected is not None: + _assert_format_equal(expected, actual) + # It's not useful to run safety checks if we're expecting no changes anyway. The + # assertion right above will raise if reality does actually make changes. This just + # avoids wasted CPU cycles. + if not fast and source != actual: + # Unfortunately the AST equivalence check relies on the built-in ast module + # being able to parse the code being formatted. This doesn't always work out + # when checking modern code on older versions. + if minimum_version is None or sys.version_info >= minimum_version: + black.assert_equivalent(source, actual) + black.assert_stable(source, actual, mode=mode) + + +def dump_to_stderr(*output: str) -> str: + return "\n" + "\n".join(output) + "\n" + +class BlackBaseTestCase(unittest.TestCase): + def assertFormatEqual(self, expected: str, actual: str) -> None: + _assert_format_equal(expected, actual) -def read_data(name: str, data: bool = True) -> Tuple[str, str]: + +def get_base_dir(data: bool) -> Path: + return DATA_DIR if data else PROJECT_ROOT + + +def all_data_cases(subdir_name: str, data: bool = True) -> List[str]: + cases_dir = get_base_dir(data) / subdir_name + assert cases_dir.is_dir() + return [case_path.stem for case_path in cases_dir.iterdir()] + + +def get_case_path( + subdir_name: str, name: str, data: bool = True, suffix: str = PYTHON_SUFFIX +) -> Path: + """Get case path from name""" + case_path = get_base_dir(data) / subdir_name / name + if not name.endswith(ALLOWED_SUFFIXES): + case_path = case_path.with_suffix(suffix) + assert case_path.is_file(), f"{case_path} is not a file." + return case_path + + +def read_data(subdir_name: str, name: str, data: bool = True) -> Tuple[str, str]: """read_data('test_name') -> 'input', 'output'""" - if not name.endswith((".py", ".pyi", ".out", ".diff")): - name += ".py" + return read_data_from_file(get_case_path(subdir_name, name, data)) + + +def read_data_from_file(file_name: Path) -> Tuple[str, str]: + with open(file_name, "r", encoding="utf8") as test: + lines = test.readlines() _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, "") @@ -41,3 +186,26 @@ def read_data(name: str, data: bool = True) -> Tuple[str, str]: # 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" + + +def read_jupyter_notebook(subdir_name: str, name: str, data: bool = True) -> str: + return read_jupyter_notebook_from_file( + get_case_path(subdir_name, name, data, suffix=".ipynb") + ) + + +def read_jupyter_notebook_from_file(file_name: Path) -> str: + with open(file_name, mode="rb") as fd: + content_bytes = fd.read() + return content_bytes.decode() + + +@contextmanager +def change_directory(path: Path) -> Iterator[None]: + """Context manager to temporarily chdir to a different directory.""" + previous_dir = os.getcwd() + try: + os.chdir(path) + yield + finally: + os.chdir(previous_dir)