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📁 ..	-	2026-03-27 02:38
📄 __init__.py try: from ._version import version as __version__ except ImportError: # broken installation, we don't even try (copied from pytest implementation) __version__ = "unknown"	183 B	2026-01-20 12:58
📁 __pycache__	-	2026-03-21 15:45
📄 _utils.py import os import re from pathlib import Path import pytest SIMPLE_VERSION_REGEX = re.compile(r'([0-9]+)\.([0-9]+)\.([0-9]+)') ILLEGAL_FILENAME_CHARS = r'\/:*?"<>\|' def shorten_path(path: Path) -> Path: """ Returns the path relative to the current working directory if possible. Otherwise return the path unchanged. """ try: return path.relative_to(os.getcwd()) except ValueError: return path def get_valid_filename(s: str) -> str: """ Return the given string converted to a string that can be used for a clean filename. Taken from https://github.com/django/django/blob/master/django/utils/text.py """ s = str(s).strip().replace(' ', '_') s = re.sub(r'(?u)[^-\w.]', '', s) s = {'': 'empty', '.': 'dot', '..': 'dotdot'}.get(s, s) return s def might_be_valid_filename(s: str) -> bool: """ Returns false if the given string is definitely a path traversal or not a valid filename. Returns true if the string might be a valid filename. Note: This isn't secure, it just catches most accidental path traversals or invalid filenames. """ return not ( len(s) == 0 or s == '.' or s == '..' or any(c in s for c in ILLEGAL_FILENAME_CHARS) ) def simple_version_parse(version: str): """ Returns a 3 tuple of the versions major, minor, and patch. Raises a value error if the version string is unsupported. """ match = SIMPLE_VERSION_REGEX.match(version) if match is None: raise ValueError('Unsupported version format') return tuple(int(part) for part in match.groups()) def _pytest_expected_on_right() -> bool: """ Returns true if pytest prints string diffs correctly for: assert tested_value == expected_value Returns false if pytest prints string diffs correctly for: assert expected_value == tested_value """ # pytest diffs before version 5.4.0 assumed expected to be on the left hand side. try: pytest_version = simple_version_parse(pytest.__version__) except ValueError: return True else: return pytest_version >= (5, 4, 0) def flatten_dict(d: dict): """ Returns the flattened dict representation of the given dict. Example: >>> flatten_dict({ ... 'a': 1, ... 'b': { ... 'c': 2 ... }, ... 'd': {}, ... }) [(['a'], 1), (['b', 'c'], 2)] """ assert type(d) is dict result = [] _flatten_dict(d, result, []) return result def _flatten_dict(obj, result, prefix): if type(obj) is dict: for k, v in obj.items(): prefix.append(k) _flatten_dict(v, result, prefix) prefix.pop() else: result.append((list(prefix), obj)) def flatten_filesystem_dict(d): """ Returns the flattened dict of a nested dictionary structure describing a filesystem. Raises ``ValueError`` if any of the dictionary keys are invalid filenames. Example: >>> flatten_filesystem_dict({ ... 'file1.txt': '111', ... 'dir1': { ... 'file2.txt': '222' ... }, ... }) {'file1.txt': '111', 'dir1/file2.txt': '222'} """ result = {} for key_list, obj in flatten_dict(d): for i, key in enumerate(key_list): if not might_be_valid_filename(key): key_list_str = ''.join('[{!r}]'.format(k) for k in key_list[:i]) raise ValueError('Key {!r} in d{} must be a valid file name.'.format(key, key_list_str)) result['/'.join(key_list)] = obj return result	3.61 KB	2026-01-20 12:58
📄 _version.py # coding: utf-8 # file generated by setuptools_scm # don't change, don't track in version control version = '0.9.0' version_tuple = (0, 9, 0)	142 B	2026-01-20 12:58
📄 plugin.py import operator import os import re from pathlib import Path from typing import List, Union import pytest import _pytest.python from pytest_snapshot._utils import shorten_path, get_valid_filename, _pytest_expected_on_right, flatten_filesystem_dict PARAMETRIZED_TEST_REGEX = re.compile(r'^.?\[(.)]$') def pytest_addoption(parser): group = parser.getgroup('snapshot') group.addoption( '--snapshot-update', action='store_true', help='Update snapshot files instead of testing against them.', ) group.addoption( '--allow-snapshot-deletion', action='store_true', help='Allow snapshot deletion when updating snapshots.', ) @pytest.fixture def snapshot(request): default_snapshot_dir = _get_default_snapshot_dir(request.node) with Snapshot(request.config.option.snapshot_update, request.config.option.allow_snapshot_deletion, default_snapshot_dir) as snapshot: yield snapshot def _assert_equal(value, snapshot) -> None: if _pytest_expected_on_right(): assert value == snapshot else: assert snapshot == value def _file_encode(string: str) -> bytes: """ Returns the bytes that would be in a file created using ``path.write_text(string)``. See universal newlines documentation. """ if '\r' in string: raise ValueError('''\ Snapshot testing strings containing "\\r" is not supported. To snapshot test non-standard newlines you should convert the tested value to bytes. Warning: git may decide to modify the newlines in the snapshot file. To avoid this read \ https://docs.github.com/en/get-started/getting-started-with-git/configuring-git-to-handle-line-endings''') return string.replace('\n', os.linesep).encode() def _file_decode(data: bytes) -> str: """ Returns the string that would be read from a file using ``path.read_text(string)``. See universal newlines documentation. """ return data.decode().replace('\r\n', '\n').replace('\r', '\n') class Snapshot: _snapshot_update = None # type: bool _allow_snapshot_deletion = None # type: bool _created_snapshots = None # type: List[Path] _updated_snapshots = None # type: List[Path] _snapshots_to_delete = None # type: List[Path] _snapshot_dir = None # type: Path def __init__(self, snapshot_update: bool, allow_snapshot_deletion: bool, snapshot_dir: Path): self._snapshot_update = snapshot_update self._allow_snapshot_deletion = allow_snapshot_deletion self.snapshot_dir = snapshot_dir self._created_snapshots = [] self._updated_snapshots = [] self._snapshots_to_delete = [] def __enter__(self): return self def __exit__(self, exc_type, exc_val, exc_tb): if self._created_snapshots or self._updated_snapshots or self._snapshots_to_delete: message_lines = ['Snapshot directory was modified: {}'.format(shorten_path(self.snapshot_dir)), ' (verify that the changes are expected before committing them to version control)'] if self._created_snapshots: message_lines.append(' Created snapshots:') message_lines.extend(' ' + str(s.relative_to(self.snapshot_dir)) for s in self._created_snapshots) if self._updated_snapshots: message_lines.append(' Updated snapshots:') message_lines.extend(' ' + str(s.relative_to(self.snapshot_dir)) for s in self._updated_snapshots) if self._snapshots_to_delete: if self._allow_snapshot_deletion: for path in self._snapshots_to_delete: path.unlink() message_lines.append(' Deleted snapshots:') else: message_lines.append(' Snapshots that should be deleted: ' '(run pytest with --allow-snapshot-deletion to delete them)') message_lines.extend(' ' + str(s.relative_to(self.snapshot_dir)) for s in self._snapshots_to_delete) pytest.fail('\n'.join(message_lines), pytrace=False) @property def snapshot_dir(self): return self._snapshot_dir @snapshot_dir.setter def snapshot_dir(self, value): self._snapshot_dir = Path(value).absolute() def _snapshot_path(self, snapshot_name: Union[str, Path]) -> Path: """ Returns the absolute path to the given snapshot. """ if isinstance(snapshot_name, Path): snapshot_path = snapshot_name.absolute() else: snapshot_path = self.snapshot_dir.joinpath(snapshot_name) # TODO: snapshot_path = snapshot_path.resolve(strict=False). Requires Python >3.6 for strict=False. if self.snapshot_dir not in snapshot_path.parents: raise ValueError('Snapshot path {} is not in {}'.format( shorten_path(snapshot_path), shorten_path(self.snapshot_dir))) return snapshot_path def _get_compare_encode_decode(self, value: Union[str, bytes]): """ Returns a 3-tuple of a compare function, an encoding function, and a decoding function. * The compare function should compare the object to the value of its snapshot, raising an AssertionError with a useful error message if they are different. * The encoding function should encode the value into bytes for saving to a snapshot file. * The decoding function should decode bytes from a snapshot file into a object. """ if isinstance(value, str): return _assert_equal, _file_encode, _file_decode elif isinstance(value, bytes): return _assert_equal, lambda x: x, lambda x: x else: raise TypeError('value must be str or bytes') def assert_match(self, value: Union[str, bytes], snapshot_name: Union[str, Path]): """ Asserts that ``value`` equals the current value of the snapshot with the given ``snapshot_name``. If pytest was run with the --snapshot-update flag, the snapshot will instead be updated to ``value``. The test will fail if there were any changes to the snapshot. """ __tracebackhide__ = operator.methodcaller("errisinstance", AssertionError) compare, encode, decode = self._get_compare_encode_decode(value) snapshot_path = self._snapshot_path(snapshot_name) if snapshot_path.is_file(): encoded_expected_value = snapshot_path.read_bytes() elif snapshot_path.exists(): raise AssertionError('snapshot exists but is not a file: {}'.format(shorten_path(snapshot_path))) else: encoded_expected_value = None if self._snapshot_update: encoded_value = encode(value) if encoded_expected_value is None or encoded_value != encoded_expected_value: decoded_encoded_value = decode(encoded_value) if decoded_encoded_value != value: raise ValueError("value is not supported by pytest-snapshot's serializer.") snapshot_path.parent.mkdir(parents=True, exist_ok=True) snapshot_path.write_bytes(encoded_value) if encoded_expected_value is None: self._created_snapshots.append(snapshot_path) else: self._updated_snapshots.append(snapshot_path) else: if encoded_expected_value is not None: expected_value = decode(encoded_expected_value) try: compare(value, expected_value) except AssertionError as e: snapshot_diff_msg = str(e) else: snapshot_diff_msg = None if snapshot_diff_msg is not None: snapshot_diff_msg = 'value does not match the expected value in snapshot {}\n' \ ' (run pytest with --snapshot-update to update snapshots)\n{}'.format( shorten_path(snapshot_path), snapshot_diff_msg) raise AssertionError(snapshot_diff_msg) else: raise AssertionError( "snapshot {} doesn't exist. (run pytest with --snapshot-update to create it)".format( shorten_path(snapshot_path))) def assert_match_dir(self, dir_dict: dict, snapshot_dir_name: Union[str, Path]): """ Asserts that the values in dir_dict equal the current values in the given snapshot directory. If pytest was run with the --snapshot-update flag, the snapshots will be updated. The test will fail if there were any changes to the snapshots. """ __tracebackhide__ = operator.methodcaller("errisinstance", AssertionError) if not isinstance(dir_dict, dict): raise TypeError('dir_dict must be a dictionary') snapshot_dir_path = self._snapshot_path(snapshot_dir_name) values_by_filename = flatten_filesystem_dict(dir_dict) if snapshot_dir_path.is_dir(): existing_names = {p.relative_to(snapshot_dir_path).as_posix() for p in snapshot_dir_path.rglob('*') if p.is_file()} elif snapshot_dir_path.exists(): raise AssertionError('snapshot exists but is not a directory: {}'.format(shorten_path(snapshot_dir_path))) else: existing_names = set() names = set(values_by_filename) added_names = names - existing_names removed_names = existing_names - names if self._snapshot_update: self._snapshots_to_delete.extend(snapshot_dir_path.joinpath(name) for name in sorted(removed_names)) else: if added_names or removed_names: message_lines = ['Values do not match snapshots in {}'.format(shorten_path(snapshot_dir_path)), ' (run pytest with --snapshot-update to update the snapshot directory)'] if added_names: message_lines.append(" Values without snapshots:") message_lines.extend(' ' + s for s in added_names) if removed_names: message_lines.append(" Snapshots without values:") message_lines.extend(' ' + s for s in removed_names) raise AssertionError('\n'.join(message_lines)) # Call assert_match to add, update, or assert equality for all snapshot files in the directory. for name, value in values_by_filename.items(): self.assert_match(value, snapshot_dir_path.joinpath(name)) def _get_default_snapshot_dir(node: _pytest.python.Function) -> Path: """ Returns the default snapshot directory for the pytest test. """ test_module_dir = node.fspath.dirpath() test_module = node.fspath.purebasename if '[' not in node.name: test_name = node.name parametrize_name = None else: test_name = node.originalname parametrize_match = PARAMETRIZED_TEST_REGEX.match(node.name) assert parametrize_match is not None, 'Expected request.node.name to be of format TEST_FUNCTION[PARAMS]' parametrize_name = parametrize_match.group(1) parametrize_name = get_valid_filename(parametrize_name) default_snapshot_dir = test_module_dir.join('snapshots', test_module, test_name) if parametrize_name is not None: default_snapshot_dir = default_snapshot_dir.join(parametrize_name) return Path(str(default_snapshot_dir))	11.47 KB	2026-01-20 12:58

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