Initial commit: add .gitignore and README

.venv/lib/python3.12/site-packages/mypy/test/meta/_pytest.py

@@ -0,0 +1,72 @@
+import shlex
+import subprocess
+import sys
+import textwrap
+import uuid
+from collections.abc import Iterable
+from dataclasses import dataclass
+from pathlib import Path
+
+from mypy.test.config import test_data_prefix
+
+
+@dataclass
+class PytestResult:
+    input: str
+    input_updated: str  # any updates made by --update-data
+    stdout: str
+    stderr: str
+
+
+def dedent_docstring(s: str) -> str:
+    return textwrap.dedent(s).lstrip()
+
+
+def run_pytest_data_suite(
+    data_suite: str,
+    *,
+    data_file_prefix: str = "check",
+    pytest_node_prefix: str = "mypy/test/testcheck.py::TypeCheckSuite",
+    extra_args: Iterable[str],
+    max_attempts: int,
+) -> PytestResult:
+    """
+    Runs a suite of data test cases through pytest until either tests pass
+    or until a maximum number of attempts (needed for incremental tests).
+
+    :param data_suite: the actual "suite" i.e. the contents of a .test file
+    """
+    p_test_data = Path(test_data_prefix)
+    p_root = p_test_data.parent.parent
+    p = p_test_data / f"{data_file_prefix}-meta-{uuid.uuid4()}.test"
+    assert not p.exists()
+    data_suite = dedent_docstring(data_suite)
+    try:
+        p.write_text(data_suite)
+
+        test_nodeid = f"{pytest_node_prefix}::{p.name}"
+        extra_args = [sys.executable, "-m", "pytest", "-n", "0", "-s", *extra_args, test_nodeid]
+        cmd = shlex.join(extra_args)
+        for i in range(max_attempts - 1, -1, -1):
+            print(f">> {cmd}")
+            proc = subprocess.run(extra_args, capture_output=True, check=False, cwd=p_root)
+            if proc.returncode == 0:
+                break
+            prefix = "NESTED PYTEST STDOUT"
+            for line in proc.stdout.decode().splitlines():
+                print(f"{prefix}: {line}")
+                prefix = " " * len(prefix)
+            prefix = "NESTED PYTEST STDERR"
+            for line in proc.stderr.decode().splitlines():
+                print(f"{prefix}: {line}")
+                prefix = " " * len(prefix)
+            print(f"Exit code {proc.returncode} ({i} attempts remaining)")
+
+        return PytestResult(
+            input=data_suite,
+            input_updated=p.read_text(),
+            stdout=proc.stdout.decode(),
+            stderr=proc.stderr.decode(),
+        )
+    finally:
+        p.unlink()