wip: really, no sysmon warnings

Author: nedbat

pyproject.toml

@@ -128,6 +128,8 @@ filterwarnings = [
 
     ## Pytest warns if it can't collect things that seem to be tests. This should be an error.
     "error::pytest.PytestCollectionWarning",
+
+    "ignore:.*no-sysmon"
 ]
 
 # xfail tests that pass should fail the test suite

tests/conftest.py

@@ -90,6 +90,7 @@ def reset_filesdotpy_globals() -> Iterator[None]:
 
 def pytest_sessionstart() -> None:
     """Run once at the start of the test session."""
+    warnings.filterwarnings("ignore", r".*no-sysmon")
     # Only in the main process...
     if WORKER == "none":
         # Create a .pth file for measuring subprocess coverage.
@@ -99,6 +100,7 @@ def pytest_sessionstart() -> None:
         # subcover.pth is deleted by pytest_sessionfinish below.
 
 
+
 def pytest_sessionfinish() -> None:
     """Hook the end of a test session, to clean up."""
     # This is called by each of the workers and by the main process.

tests/helpers.py

@@ -52,6 +52,12 @@ def run_command(cmd: str) -> tuple[int, str]:
     sub_env = dict(os.environ)
     sub_env['PYTHONIOENCODING'] = encoding
 
+    # We might have COVERAGE_PROCESS_START set for metacov, but don't want that
+    # affecting commands we run in tests.
+    proc_start = sub_env.get("COVERAGE_PROCESS_START")
+    if proc_start and "metacov.ini" in proc_start:
+        del sub_env["COVERAGE_PROCESS_START"]
+
     proc = subprocess.Popen(
         cmd,
         shell=True,