"""Utilities for processing .test files containing test case descriptions."""

from __future__ import annotations

import os

import os.path

import posixpath

import re

import shutil

import sys

import tempfile

from abc import abstractmethod

from collections.abc import Iterator

from dataclasses import dataclass

from pathlib import Path

from re import Pattern

from typing import Any, Final, NamedTuple, NoReturn, TypeAlias as _TypeAlias

import pytest

from mypy import defaults

from mypy.test.config import PREFIX, mypyc_output_dir, test_data_prefix, test_temp_dir

root_dir = os.path.normpath(PREFIX)

# Debuggers that we support for debugging mypyc run tests

# implementation of using each of these debuggers is in test_run.py

# TODO: support more debuggers

SUPPORTED_DEBUGGERS: Final = ["gdb", "lldb"]

# File modify/create operation: copy module contents from source_path.

class UpdateFile(NamedTuple):

module: str

content: str

target_path: str

# File delete operation: delete module file.

class DeleteFile(NamedTuple):

module: str

path: str

FileOperation: _TypeAlias = UpdateFile | DeleteFile

def _file_arg_to_module(filename: str) -> str:

filename, _ = os.path.splitext(filename)

parts = filename.split("/") # not os.sep since it comes from test data

if parts[-1] == "__init__":

parts.pop()

return ".".join(parts)

def parse_test_case(case: DataDrivenTestCase) -> None:

"""Parse and prepare a single case from suite with test case descriptions.

This method is part of the setup phase, just before the test case is run.

"""

test_items = parse_test_data(case.data, case.name)

base_path = case.suite.base_path

if case.suite.native_sep:

join = os.path.join

else:

join = posixpath.join

out_section_missing = case.suite.required_out_section

files: list[tuple[str, str]] = [] # path and contents

output_files: list[tuple[str, str | Pattern[str]]] = [] # output path and contents

output: list[str] = [] # Regular output errors

output2: dict[int, list[str]] = {} # Output errors for incremental, runs 2+

deleted_paths: dict[int, set[str]] = {} # from run number of paths

stale_modules: dict[int, set[str]] = {} # from run number to module names

rechecked_modules: dict[int, set[str]] = {} # from run number module names

triggered: list[str] = [] # Active triggers (one line per incremental step)

targets: dict[int, list[str]] = {} # Fine-grained targets (per fine-grained update)

test_modules: list[str] = [] # Modules which are deemed "test" (vs "fixture")

def _case_fail(msg: str) -> NoReturn:

pytest.fail(f"{case.file}:{case.line}: {msg}", pytrace=False)

# Process the parsed items. Each item has a header of form [id args],

# optionally followed by lines of text.

item = first_item = test_items[0]

test_modules.append("__main__")

for item in test_items[1:]:

def _item_fail(msg: str) -> NoReturn:

item_abs_line = case.line + item.line - 2

pytest.fail(f"{case.file}:{item_abs_line}: {msg}", pytrace=False)

if item.id in {"file", "fixture", "outfile", "outfile-re"}:

# Record an extra file needed for the test case.

assert item.arg is not None

contents = expand_variables("\n".join(item.data))

path = join(base_path, item.arg)

if item.id != "fixture":

test_modules.append(_file_arg_to_module(item.arg))

if item.id in {"file", "fixture"}:

files.append((path, contents))

elif item.id == "outfile-re":

output_files.append((path, re.compile(contents.rstrip(), re.S)))

elif item.id == "outfile":

output_files.append((path, contents))

elif item.id == "builtins":

# Use an alternative stub file for the builtins module.

assert item.arg is not None

mpath = join(os.path.dirname(case.file), item.arg)

with open(mpath, encoding="utf8") as f:

files.append((join(base_path, "builtins.pyi"), f.read()))

elif item.id == "typing":

# Use an alternative stub file for the typing module.

assert item.arg is not None

src_path = join(os.path.dirname(case.file), item.arg)

with open(src_path, encoding="utf8") as f:

files.append((join(base_path, "typing.pyi"), f.read()))

elif item.id == "_typeshed":

# Use an alternative stub file for the _typeshed module.

assert item.arg is not None

src_path = join(os.path.dirname(case.file), item.arg)

with open(src_path, encoding="utf8") as f:

files.append((join(base_path, "_typeshed.pyi"), f.read()))

elif re.match(r"stale[0-9]*$", item.id):

passnum = 1 if item.id == "stale" else int(item.id[len("stale") :])

assert passnum > 0

modules = set() if item.arg is None else {t.strip() for t in item.arg.split(",")}

stale_modules[passnum] = modules

elif re.match(r"rechecked[0-9]*$", item.id):

passnum = 1 if item.id == "rechecked" else int(item.id[len("rechecked") :])

assert passnum > 0

modules = set() if item.arg is None else {t.strip() for t in item.arg.split(",")}

rechecked_modules[passnum] = modules

elif re.match(r"targets[0-9]*$", item.id):

passnum = 1 if item.id == "targets" else int(item.id[len("targets") :])

assert passnum > 0

reprocessed = [] if item.arg is None else [t.strip() for t in item.arg.split(",")]

targets[passnum] = reprocessed

elif item.id == "delete":

# File/directory to delete during a multi-step test case

assert item.arg is not None

m = re.match(r"(.*)\.([0-9]+)$", item.arg)

if m is None:

_item_fail(f"Invalid delete section {item.arg!r}")

num = int(m.group(2))

if num < 2:

_item_fail(f"Can't delete during step {num}")

full = join(base_path, m.group(1))

deleted_paths.setdefault(num, set()).add(full)

elif re.match(r"out[0-9]*$", item.id):

if item.arg is None:

args = []

else:

args = item.arg.split(",")

version_check = True

for arg in args:

if arg.startswith("version"):

compare_op = arg[7:9]

if compare_op not in {">=", "=="}:

_item_fail("Only >= and == version checks are currently supported")

version_str = arg[9:]

try:

version = tuple(int(x) for x in version_str.split("."))

except ValueError:

_item_fail(f"{version_str!r} is not a valid python version")

if compare_op == ">=":

if version <= defaults.PYTHON3_VERSION:

_item_fail(

f"{arg} always true since minimum runtime version is {defaults.PYTHON3_VERSION}"

)

version_check = sys.version_info >= version

elif compare_op == "==":

if version < defaults.PYTHON3_VERSION:

_item_fail(

f"{arg} always false since minimum runtime version is {defaults.PYTHON3_VERSION}"

)

if not 1 < len(version) < 4:

_item_fail(

f'Only minor or patch version checks are currently supported with "==": {version_str!r}'

)

version_check = sys.version_info[: len(version)] == version

if version_check:

tmp_output = [expand_variables(line) for line in item.data]

if os.path.sep == "\\" and case.normalize_output:

tmp_output = [fix_win_path(line) for line in tmp_output]

if item.id == "out" or item.id == "out1":

output = tmp_output

else:

passnum = int(item.id[len("out") :])

assert passnum > 1

output2[passnum] = tmp_output

out_section_missing = False

elif item.id == "triggered" and item.arg is None:

triggered = item.data

else:

section_str = item.id + (f" {item.arg}" if item.arg else "")

_item_fail(f"Invalid section header [{section_str}] in case {case.name!r}")

if out_section_missing:

_case_fail(f"Required output section not found in case {case.name!r}")

for passnum in stale_modules.keys():

if passnum not in rechecked_modules:

# If the set of rechecked modules isn't specified, make it the same as the set

# of modules with a stale public interface.

rechecked_modules[passnum] = stale_modules[passnum]

if (

passnum in stale_modules

and passnum in rechecked_modules

and not stale_modules[passnum].issubset(rechecked_modules[passnum])

):

_case_fail(f"Stale modules after pass {passnum} must be a subset of rechecked modules")

output_inline_start = len(output)

input = first_item.data

expand_errors(input, output, "main")

for file_path, contents in files:

expand_errors(contents.split("\n"), output, file_path)

seen_files = set()

for file, _ in files:

if file in seen_files:

_case_fail(f"Duplicated filename {file}. Did you include it multiple times?")

seen_files.add(file)

case.input = input

case.output = output

case.output_inline_start = output_inline_start

case.output2 = output2

case.last_line = case.line + item.line + len(item.data) - 2

case.files = files

case.output_files = output_files

case.expected_stale_modules = stale_modules

case.expected_rechecked_modules = rechecked_modules

case.deleted_paths = deleted_paths

case.triggered = triggered or []

case.expected_fine_grained_targets = targets

case.test_modules = test_modules

class DataDrivenTestCase(pytest.Item):

"""Holds parsed data-driven test cases, and handles directory setup and teardown."""

# Override parent member type

parent: DataFileCollector

input: list[str]

output: list[str] # Output for the first pass

output_inline_start: int

output2: dict[int, list[str]] # Output for runs 2+, indexed by run number

# full path of test suite

file = ""

line = 0

# (file path, file content) tuples

files: list[tuple[str, str]]

# Modules which is to be considered "test" rather than "fixture"

test_modules: list[str]

expected_stale_modules: dict[int, set[str]]

expected_rechecked_modules: dict[int, set[str]]

expected_fine_grained_targets: dict[int, list[str]]

# Whether or not we should normalize the output to standardize things like

# forward vs backward slashes in file paths for Windows vs Linux.

normalize_output: bool

# Extra attributes used by some tests.

last_line: int

output_files: list[tuple[str, str | Pattern[str]]] # Path and contents for output files

deleted_paths: dict[int, set[str]] # Mapping run number -> paths

triggered: list[str] # Active triggers (one line per incremental step)

def __init__(

self,

parent: DataFileCollector,

suite: DataSuite,

*,

file: str,

name: str,

writescache: bool,

only_when: str,

normalize_output: bool,

platform: str | None,

skip: bool,

xfail: bool,

data: str,

line: int,

) -> None:

assert isinstance(parent, DataFileCollector)

super().__init__(name, parent)

self.suite = suite

self.file = file

self.writescache = writescache

self.only_when = only_when

self.normalize_output = normalize_output

if (platform == "windows" and sys.platform != "win32") or (

platform == "posix" and sys.platform == "win32"

):

skip = True

self.skip = skip

self.xfail = xfail

self.data = data

self.line = line

self.old_cwd: str | None = None

self.tmpdir: str | None = None

def runtest(self) -> None:

if self.skip:

pytest.skip()

# TODO: add a better error message for when someone uses skip and xfail at the same time

elif self.xfail:

self.add_marker(pytest.mark.xfail)

if (

not [line for line in self.input if line.strip()]

and "Empty" not in self.name

and not [

file

for file in self.files

# these files are added based on other things

if os.path.basename(file[0]) not in ("typing.pyi", "_typeshed.pyi", "builtins.pyi")

]

):

raise AssertionError(f"{self.name} is empty.")

parent = self.getparent(DataSuiteCollector)

assert parent is not None, "Should not happen"

suite = parent.obj()

suite.setup()

try:

suite.run_case(self)

except Exception:

# As a debugging aid, support copying the contents of the tmp directory somewhere

save_dir: str | None = self.config.getoption("--save-failures-to", None)

if save_dir:

assert self.tmpdir is not None

target_dir = os.path.join(save_dir, os.path.basename(self.tmpdir))

print(f"Copying data from test {self.name} to {target_dir}")

if not os.path.isabs(target_dir):

assert self.old_cwd

target_dir = os.path.join(self.old_cwd, target_dir)

shutil.copytree(self.tmpdir, target_dir)

raise

def setup(self) -> None:

parse_test_case(case=self)

self.old_cwd = os.getcwd()

self.tmpdir = tempfile.mkdtemp(prefix="mypy-test-")

os.chdir(self.tmpdir)

os.mkdir(test_temp_dir)

# Precalculate steps for find_steps()

steps: dict[int, list[FileOperation]] = {}

for path, content in self.files:

m = re.match(r".*\.([0-9]+)$", path)

if m:

# Skip writing subsequent incremental steps - rather

# store them as operations.

num = int(m.group(1))

assert num >= 2

target_path = re.sub(r"\.[0-9]+$", "", path)

module = module_from_path(target_path)

operation = UpdateFile(module, content, target_path)

steps.setdefault(num, []).append(operation)

else:

# Write the first incremental steps

dir = os.path.dirname(path)

os.makedirs(dir, exist_ok=True)

with open(path, "w", encoding="utf8") as f:

f.write(content)

for num, paths in self.deleted_paths.items():

assert num >= 2

for path in paths:

module = module_from_path(path)

steps.setdefault(num, []).append(DeleteFile(module, path))

max_step = max(steps) if steps else 2

self.steps = [steps.get(num, []) for num in range(2, max_step + 1)]

def teardown(self) -> None:

if self.old_cwd is not None:

os.chdir(self.old_cwd)

if self.tmpdir is not None:

shutil.rmtree(self.tmpdir, ignore_errors=True)

self.old_cwd = None

self.tmpdir = None

def reportinfo(self) -> tuple[str, int, str]:

return self.file, self.line, self.name

def repr_failure(

self, excinfo: pytest.ExceptionInfo[BaseException], style: Any | None = None

) -> str:

excrepr: object

if isinstance(excinfo.value, SystemExit):

# We assume that before doing exit() (which raises SystemExit) we've printed

# enough context about what happened so that a stack trace is not useful.

# In particular, uncaught exceptions during semantic analysis or type checking

# call exit() and they already print out a stack trace.

excrepr = excinfo.exconly()

elif isinstance(excinfo.value, pytest.fail.Exception) and not excinfo.value.pytrace:

excrepr = excinfo.exconly()

else:

excinfo.traceback = self.parent._traceback_filter(excinfo)

excrepr = excinfo.getrepr(style="short")

return f"data: {self.file}:{self.line}:\n{excrepr}"

def find_steps(self) -> list[list[FileOperation]]:

"""Return a list of descriptions of file operations for each incremental step.

The first list item corresponds to the first incremental step, the second for the

second step, etc. Each operation can either be a file modification/creation (UpdateFile)

or deletion (DeleteFile).

Defaults to having two steps if there aern't any operations.

"""

return self.steps

def module_from_path(path: str) -> str:

path = re.sub(r"\.pyi?$", "", path)

# We can have a mix of Unix-style and Windows-style separators.

parts = re.split(r"[/\\]", path)

del parts[0]

module = ".".join(parts)

module = re.sub(r"\.__init__$", "", module)

return module

@dataclass

class TestItem:

"""Parsed test caseitem.

An item is of the form

[id arg]

.. data ..

"""

id: str

arg: str | None

# Processed, collapsed text data

data: list[str]

# Start line: 1-based, inclusive, relative to testcase

line: int

# End line: 1-based, exclusive, relative to testcase; not same as `line + len(test_item.data)` due to collapsing

end_line: int

@property

def trimmed_newlines(self) -> int: # compensates for strip_list

return self.end_line - self.line - len(self.data)

def parse_test_data(raw_data: str, name: str) -> list[TestItem]:

"""Parse a list of lines that represent a sequence of test items."""

lines = ["", "[case " + name + "]"] + raw_data.split("\n")

ret: list[TestItem] = []

data: list[str] = []

id: str | None = None

arg: str | None = None

i = 0

i0 = 0

while i < len(lines):

s = lines[i].strip()

if lines[i].startswith("[") and s.endswith("]"):

if id:

data = collapse_line_continuation(data)

data = strip_list(data)

ret.append(TestItem(id, arg, data, i0 + 1, i))

i0 = i

id = s[1:-1]

arg = None

if " " in id:

arg = id[id.index(" ") + 1 :]

id = id[: id.index(" ")]

data = []

elif lines[i].startswith("\\["):

data.append(lines[i][1:])

elif not lines[i].startswith("--"):

data.append(lines[i])

elif lines[i].startswith("----"):

data.append(lines[i][2:])

i += 1

# Process the last item.

if id:

data = collapse_line_continuation(data)

data = strip_list(data)

ret.append(TestItem(id, arg, data, i0 + 1, i - 1))

return ret

def strip_list(l: list[str]) -> list[str]:

"""Return a stripped copy of l.

Strip whitespace at the end of all lines, and strip all empty

lines from the end of the array.

"""

r: list[str] = []

for s in l:

# Strip spaces at end of line

r.append(re.sub(r"\s+$", "", s))

while r and r[-1] == "":

r.pop()

return r

def collapse_line_continuation(l: list[str]) -> list[str]:

r: list[str] = []

cont = False

for s in l:

ss = re.sub(r"\\$", "", s)

if cont:

r[-1] += re.sub("^ +", "", ss)

else:

r.append(ss)

cont = s.endswith("\\")

return r

def expand_variables(s: str) -> str:

return s.replace("<ROOT>", root_dir)

def expand_errors(input: list[str], output: list[str], fnam: str) -> None:

"""Transform comments such as '# E: message' or

'# E:3: message' in input.

The result is lines like 'fnam:line: error: message'.

"""

for i in range(len(input)):

# The first in the split things isn't a comment

for possible_err_comment in re.split("(?:^| )# ", input[i])[1:]:

m = re.search(

r"^([ENW]):((?P<col>\d+):)? (?P<message>.*)$", possible_err_comment.strip()

)

if m:

if m.group(1) == "E":

severity = "error"

elif m.group(1) == "N":

severity = "note"

elif m.group(1) == "W":

severity = "warning"

col = m.group("col")

message = m.group("message")

message = message.replace("\\#", "#") # adds back escaped # character

if col is None:

output.append(f"{fnam}:{i + 1}: {severity}: {message}")

else:

output.append(f"{fnam}:{i + 1}:{col}: {severity}: {message}")

def fix_win_path(line: str) -> str:

r"""Changes Windows paths to Linux paths in error messages.

E.g. foo\bar.py -> foo/bar.py.

"""

line = line.replace(root_dir, root_dir.replace("\\", "/"))

m = re.match(r"^([\S/]+):(\d+:)?(\s+.*)", line)

if not m:

return line

else:

filename, lineno, message = m.groups()

return "{}:{}{}".format(filename.replace("\\", "/"), lineno or "", message)

def fix_cobertura_filename(line: str) -> str:

r"""Changes filename paths to Linux paths in Cobertura output files.

E.g. filename="pkg\subpkg\a.py" -> filename="pkg/subpkg/a.py".

"""

m = re.search(r'<class .* filename="(?P<filename>.*?)"', line)

if not m:

return line

return "{}{}{}".format(

line[: m.start(1)], m.group("filename").replace("\\", "/"), line[m.end(1) :]

)

##

#

# pytest setup

#

##

def pytest_sessionstart(session: Any) -> None:

# Clean up directory where mypyc tests write intermediate files on failure

# to avoid any confusion between test runs

if os.path.isdir(mypyc_output_dir):

shutil.rmtree(mypyc_output_dir)

# This function name is special to pytest. See

# https://docs.pytest.org/en/latest/reference.html#initialization-hooks

def pytest_addoption(parser: Any) -> None:

group = parser.getgroup("mypy")

group.addoption(

"--update-data",

action="store_true",

default=False,

help="Update test data to reflect actual output (supported only for certain tests)",

)

group.addoption(

"--mypy-num-workers",

type=int,

default=0,

help="Run tests using multiple worker processes for each test case",

)

group.addoption(

"--save-failures-to",

default=None,

help="Copy the temp directories from failing tests to a target directory",

)

group.addoption(

"--mypy-verbose", action="count", help="Set the verbose flag when creating mypy Options"

)

group.addoption(

"--mypyc-showc",

action="store_true",

default=False,

help="Display C code on mypyc test failures",

)

group.addoption(

"--mypyc-debug",

default=None,

dest="debugger",

choices=SUPPORTED_DEBUGGERS,

help="Run the first mypyc run test with the specified debugger",

)

@pytest.hookimpl(tryfirst=True)

def pytest_cmdline_main(config: pytest.Config) -> None:

if config.getoption("--collectonly"):

return

# --update-data is not compatible with parallelized tests, disable parallelization

if config.getoption("--update-data"):

config.option.numprocesses = 0

# This function name is special to pytest. See

# https://doc.pytest.org/en/latest/how-to/writing_plugins.html#collection-hooks

def pytest_pycollect_makeitem(collector: Any, name: str, obj: object) -> Any | None:

"""Called by pytest on each object in modules configured in conftest.py files.

collector is pytest.Collector, returns Optional[pytest.Class]

"""

if isinstance(obj, type):

# Only classes derived from DataSuite contain test cases, not the DataSuite class itself

if issubclass(obj, DataSuite) and obj is not DataSuite:

# Non-None result means this obj is a test case.

# The collect method of the returned DataSuiteCollector instance will be called later,

# with self.obj being obj.

return DataSuiteCollector.from_parent(parent=collector, name=name)

return None

_case_name_pattern = re.compile(

r"(?P<name>[a-zA-Z_0-9]+)"

r"(?P<writescache>-writescache)?"

r"(?P<only_when>-only_when_cache|-only_when_nocache)?"

r"(?P<skip_path_normalization>-skip_path_normalization)?"

r"(-(?P<platform>posix|windows))?"

r"(?P<skip>-skip)?"

r"(?P<xfail>-xfail)?"

)

def split_test_cases(

parent: DataFileCollector, suite: DataSuite, file: str

) -> Iterator[DataDrivenTestCase]:

"""Iterate over raw test cases in file, at collection time, ignoring sub items.

The collection phase is slow, so any heavy processing should be deferred to after

uninteresting tests are filtered (when using -k PATTERN switch).

"""

with open(file, encoding="utf-8") as f:

data = f.read()

cases = re.split(r"^\[case ([^]+)]+)\][ \t]*$\n", data, flags=re.DOTALL | re.MULTILINE)

cases_iter = iter(cases)

line_no = next(cases_iter).count("\n") + 1

test_names = set()

for case_id in cases_iter:

data = next(cases_iter)

m = _case_name_pattern.fullmatch(case_id)

if not m:

raise RuntimeError(f"Invalid testcase id {case_id!r}")

name = m.group("name")

if name in test_names:

raise RuntimeError(

'Found a duplicate test name "{}" in {} on line {}'.format(

name, parent.name, line_no

)

)

yield DataDrivenTestCase.from_parent(

parent=parent,

suite=suite,

file=file,

name=add_test_name_suffix(name, suite.test_name_suffix),

writescache=bool(m.group("writescache")),

only_when=m.group("only_when"),

platform=m.group("platform"),

skip=bool(m.group("skip")),

xfail=bool(m.group("xfail")),

normalize_output=not m.group("skip_path_normalization"),

data=data,

line=line_no,

)

line_no += data.count("\n") + 1

# Record existing tests to prevent duplicates:

test_names.update({name})

class DataSuiteCollector(pytest.Class):

def collect(self) -> Iterator[DataFileCollector]:

"""Called by pytest on each of the object returned from pytest_pycollect_makeitem"""

# obj is the object for which pytest_pycollect_makeitem returned self.

suite: DataSuite = self.obj

assert os.path.isdir(

suite.data_prefix

), f"Test data prefix ({suite.data_prefix}) not set correctly"

for data_file in suite.files:

yield DataFileCollector.from_parent(parent=self, name=data_file)

class DataFileFix(NamedTuple):

lineno: int # 1-offset, inclusive

end_lineno: int # 1-offset, exclusive

lines: list[str]

class DataFileCollector(pytest.Collector):

"""Represents a single `.test` data driven test file.

More context: https://github.com/python/mypy/issues/11662

"""

parent: DataSuiteCollector

_fixes: list[DataFileFix]

@classmethod # We have to fight with pytest here:

def from_parent(

cls, parent: DataSuiteCollector, *, name: str # type: ignore[override]

) -> DataFileCollector:

collector = super().from_parent(parent, name=name)

assert isinstance(collector, DataFileCollector)

return collector

def collect(self) -> Iterator[DataDrivenTestCase]:

yield from split_test_cases(

parent=self,

suite=self.parent.obj,

file=os.path.join(self.parent.obj.data_prefix, self.name),

)

def setup(self) -> None:

super().setup()

self._fixes = []

def teardown(self) -> None:

super().teardown()

self._apply_fixes()

def enqueue_fix(self, fix: DataFileFix) -> None:

self._fixes.append(fix)

def _apply_fixes(self) -> None:

if not self._fixes:

return

data_path = Path(self.parent.obj.data_prefix) / self.name

lines = data_path.read_text().split("\n")

# start from end to prevent line offsets from shifting as we update

for fix in sorted(self._fixes, reverse=True):

lines[fix.lineno - 1 : fix.end_lineno - 1] = fix.lines

data_path.write_text("\n".join(lines))

def add_test_name_suffix(name: str, suffix: str) -> str:

# Find magic suffix of form "-foobar" (used for things like "-skip").

m = re.search(r"-[-A-Za-z0-9]+$", name)

if m:

# Insert suite-specific test name suffix before the magic suffix

# which must be the last thing in the test case name since we

# are using endswith() checks.

magic_suffix = m.group(0)

return name[: -len(magic_suffix)] + suffix + magic_suffix

else:

return name + suffix

def is_incremental(testcase: DataDrivenTestCase) -> bool:

return "incremental" in testcase.name.lower() or "incremental" in testcase.file

def has_stable_flags(testcase: DataDrivenTestCase) -> bool:

if any(re.match(r"# flags[2-9]:", line) for line in testcase.input):

return False

for filename, contents in testcase.files:

if os.path.basename(filename).startswith("mypy.ini."):

return False

return True

class DataSuite:

# option fields - class variables

files: list[str]

base_path = test_temp_dir

# Allow external users of the test code to override the data prefix

data_prefix = test_data_prefix

required_out_section = False

native_sep = False

# Name suffix automatically added to each test case in the suite (can be

# used to distinguish test cases in suites that share data files)

test_name_suffix = ""

def setup(self) -> None:

"""Setup fixtures (ad-hoc)"""

@abstractmethod

def run_case(self, testcase: DataDrivenTestCase) -> None:

raise NotImplementedError