Describe the bug
With 7.10.1, the tests seem to be failing on all Pythons. Bisect points to 2134e57.
======================================================= short test summary info =======================================================
FAILED tests/test_process.py::ProcessStartupTest::test_patch_subprocess@needs_pth - KeyError: 'sub.py'
FAILED tests/test_process.py::ExecvTest::test_execv_patch[execl]@needs_pth - assert 'In main\nError processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:\n\n Traceback (...
FAILED tests/test_process.py::ExecvTest::test_execv_patch[execle]@needs_pth - KeyError: 'other.py'
FAILED tests/test_process.py::ExecvTest::test_execv_patch[execlp]@needs_pth - assert 'In main\nError processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:\n\n Traceback (...
FAILED tests/test_process.py::ExecvTest::test_execv_patch[execlpe]@needs_pth - KeyError: 'other.py'
FAILED tests/test_process.py::ExecvTest::test_execv_patch[execv]@needs_pth - assert 'In main\nError processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:\n\n Traceback (...
FAILED tests/test_process.py::ExecvTest::test_execv_patch[execve]@needs_pth - KeyError: 'other.py'
FAILED tests/test_process.py::ExecvTest::test_execv_patch[execvp]@needs_pth - assert 'In main\nError processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:\n\n Traceback (...
FAILED tests/test_process.py::ExecvTest::test_execv_patch[execvpe]@needs_pth - KeyError: 'other.py'
FAILED tests/test_process.py::ExecvTest::test_execv_patch[spawnl]@needs_pth - assert 'In main\nError processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:\n\n Traceback (...
FAILED tests/test_process.py::ExecvTest::test_execv_patch[spawnle]@needs_pth - KeyError: 'other.py'
FAILED tests/test_process.py::ExecvTest::test_execv_patch[spawnlp]@needs_pth - assert 'In main\nError processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:\n\n Traceback (...
FAILED tests/test_process.py::ExecvTest::test_execv_patch[spawnlpe]@needs_pth - KeyError: 'other.py'
FAILED tests/test_process.py::ExecvTest::test_execv_patch[spawnv]@needs_pth - assert 'In main\nError processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:\n\n Traceback (...
FAILED tests/test_process.py::ExecvTest::test_execv_patch[spawnve]@needs_pth - KeyError: 'other.py'
FAILED tests/test_process.py::ExecvTest::test_execv_patch[spawnvp]@needs_pth - assert 'In main\nError processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:\n\n Traceback (...
FAILED tests/test_process.py::ExecvTest::test_execv_patch[spawnvpe]@needs_pth - KeyError: 'other.py'
17 failed, 1460 passed, 25 skipped in 28.06s
The errors seem to all have roughly the same reason, and xdist doesn't seem relevant, i.e.:
$ pytest -o addopts= tests/test_process.py::ProcessStartupTest::test_patch_subprocess
========================================================= test session starts =========================================================
platform linux -- Python 3.13.5, pytest-8.4.1, pluggy-1.6.0
rootdir: /tmp/coveragepy
configfile: pyproject.toml
plugins: xdist-3.8.0, hypothesis-6.135.29, flaky-3.8.1
collected 1 item
tests/test_process.py F [100%]
============================================================== FAILURES ===============================================================
______________________________________________ ProcessStartupTest.test_patch_subprocess _______________________________________________
self = <tests.test_process.ProcessStartupTest object at 0x7f8f9fdddbd0>
def test_patch_subprocess(self) -> None:
self.make_file(".coveragerc", """\
[run]
patch = subprocess
""")
self.run_command("coverage run main.py")
self.run_command("coverage combine")
self.assert_exists(".coverage")
data = coverage.CoverageData()
data.read()
assert line_counts(data)["main.py"] == 3
> assert line_counts(data)["sub.py"] == 3
^^^^^^^^^^^^^^^^^^^^^^^^^^^
E KeyError: 'sub.py'
/tmp/coveragepy/tests/test_process.py:1355: KeyError
-------------------------------------------------------- Captured stdout call ---------------------------------------------------------
Error processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:
Traceback (most recent call last):
File "<frozen site>", line 207, in addpackage
File "<string>", line 1, in <module>
File "/tmp/coveragepy/coverage/control.py", line 1435, in process_startup
cov.start()
~~~~~~~~~^^
File "/tmp/coveragepy/coverage/control.py", line 681, in start
apply_patches(self, self.config)
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
File "/tmp/coveragepy/coverage/patch.py", line 82, in apply_patches
assert pth_file is not None
^^^^^^^^^^^^^^^^^^^^
AssertionError
Remainder of file ignored
Combined data file .coverage.pomiot.137273.XAxvKiBx
======================================================= short test summary info =======================================================
FAILED tests/test_process.py::ProcessStartupTest::test_patch_subprocess - KeyError: 'sub.py'
========================================================== 1 failed in 0.81s ==========================================================To Reproduce
I have reproduced with CPython 3.11.13, 3.13.5, and PyPy3.11 7.3.20.
$ coverage debug sys
-- sys -------------------------------------------------------
coverage_version: 7.10.2a0.dev1
coverage_module: /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/coverage/__init__.py
core: -none-
CTracer: unavailable
plugins.file_tracers: -none-
plugins.configurers: -none-
plugins.context_switchers: -none-
configs_attempted: /tmp/coveragepy/.coveragerc
/tmp/coveragepy/setup.cfg
/tmp/coveragepy/tox.ini
/tmp/coveragepy/pyproject.toml
configs_read: /tmp/coveragepy/tox.ini
/tmp/coveragepy/pyproject.toml
config_file: None
config_contents: -none-
data_file: -none-
python: 3.13.5 (main, Jun 12 2025, 03:41:01) [GCC 14.3.0]
platform: Linux-6.15.8-gentoo-dist-x86_64-AMD_Ryzen_5_3600_6-Core_Processor-with-glibc2.41
implementation: CPython
build: main
Jun 12 2025 03:41:01
gil_enabled: True
executable: /tmp/coveragepy/.tox/py313/bin/python
def_encoding: utf-8
fs_encoding: utf-8
pid: 114926
cwd: /tmp/coveragepy
path: /tmp/coveragepy/.tox/py313/bin
/usr/lib/python313.zip
/usr/lib/python3.13
/usr/lib/python3.13/lib-dynload
/tmp/coveragepy/.tox/py313/lib/python3.13/site-packages
environment: HOME = /home/mgorny
LIBXCB_ALLOW_SLOPPY_LOCK = 1
command_line: /tmp/coveragepy/.tox/py313/bin/coverage debug sys
sqlite3_sqlite_version: 3.50.3
sqlite3_temp_store: 0
sqlite3_compile_options: ATOMIC_INTRINSICS=1, COMPILER=gcc-15.1.1 20250705, DEFAULT_AUTOVACUUM,
DEFAULT_CACHE_SIZE=-2000, DEFAULT_FILE_FORMAT=4,
DEFAULT_JOURNAL_SIZE_LIMIT=-1, DEFAULT_MMAP_SIZE=0, DEFAULT_PAGE_SIZE=4096,
DEFAULT_PCACHE_INITSZ=20, DEFAULT_RECURSIVE_TRIGGERS,
DEFAULT_SECTOR_SIZE=4096, DEFAULT_SYNCHRONOUS=2,
DEFAULT_WAL_AUTOCHECKPOINT=1000, DEFAULT_WAL_SYNCHRONOUS=2,
DEFAULT_WORKER_THREADS=0, DIRECT_OVERFLOW_READ, ENABLE_API_ARMOR,
ENABLE_BYTECODE_VTAB, ENABLE_COLUMN_METADATA, ENABLE_DBPAGE_VTAB,
ENABLE_DBSTAT_VTAB, ENABLE_EXPLAIN_COMMENTS, ENABLE_FTS3,
ENABLE_FTS3_PARENTHESIS, ENABLE_FTS4, ENABLE_FTS5, ENABLE_GEOPOLY,
ENABLE_HIDDEN_COLUMNS, ENABLE_ICU, ENABLE_MATH_FUNCTIONS, ENABLE_MEMSYS5,
ENABLE_NORMALIZE, ENABLE_OFFSET_SQL_FUNC, ENABLE_PREUPDATE_HOOK,
ENABLE_RBU, ENABLE_RTREE, ENABLE_SESSION, ENABLE_STMTVTAB,
ENABLE_STMT_SCANSTATUS, ENABLE_UNKNOWN_SQL_FUNCTION, ENABLE_UNLOCK_NOTIFY,
ENABLE_UPDATE_DELETE_LIMIT, HAVE_ISNAN, MALLOC_SOFT_LIMIT=1024,
MAX_ATTACHED=10, MAX_COLUMN=2000, MAX_COMPOUND_SELECT=500,
MAX_DEFAULT_PAGE_SIZE=8192, MAX_EXPR_DEPTH=1000, MAX_FUNCTION_ARG=1000,
MAX_LENGTH=1000000000, MAX_LIKE_PATTERN_LENGTH=50000,
MAX_MMAP_SIZE=0x7fff0000, MAX_PAGE_COUNT=0xfffffffe, MAX_PAGE_SIZE=65536,
MAX_SQL_LENGTH=1000000000, MAX_TRIGGER_DEPTH=1000,
MAX_VARIABLE_NUMBER=32766, MAX_VDBE_OP=250000000, MAX_WORKER_THREADS=8,
MUTEX_PTHREADS, SOUNDEX, SYSTEM_MALLOC, TEMP_STORE=1, THREADSAFE=1, USE_URI
$ pip freeze
attrs==25.3.0
colorama==0.4.6
coverage @ file:///tmp/coveragepy/.tox/.tmp/package/10/coverage-7.10.2a0.dev1.tar.gz#sha256=372cf06067ebd2afe864846a07138c74f1d9d0238d386805c43a37da207ce15b
distlib==0.4.0
exceptiongroup==1.3.0
execnet==2.1.1
filelock==3.18.0
flaky==3.8.1
hypothesis==6.136.4
iniconfig==2.1.0
packaging==25.0
platformdirs==4.3.8
pluggy==1.6.0
Pygments==2.19.2
pytest==8.4.1
pytest-xdist==3.8.0
setuptools==80.9.0
sortedcontainers==2.4.0
tomli==2.2.1
typing_extensions==4.14.1
virtualenv==20.32.0Expected behavior
Passing tests :-).
Additional context
If I add a some debug prints:
diff --git a/coverage/files.py b/coverage/files.py
index af609488..48b9e375 100644
--- a/coverage/files.py
+++ b/coverage/files.py
@@ -222,12 +222,14 @@ def create_pth_file() -> Path | None:
"""Create .pth file for measuring subprocesses."""
for pth_dir in site.getsitepackages(): # pragma: part covered
pth_file = Path(pth_dir) / "subcover.pth"
+ print(f"{pth_file=}")
try:
pth_file.write_text("import coverage; coverage.process_startup()\n", encoding="utf-8")
except OSError: # pragma: cant happen
continue
else:
return pth_file
+ print("it happened")
return None # pragma: cant happenThen the output becomes:
Error processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth:
Traceback (most recent call last):
File "<frozen site>", line 207, in addpackage
File "<string>", line 1, in <module>
File "/tmp/coveragepy/coverage/control.py", line 1435, in process_startup
cov.start()
~~~~~~~~~^^
File "/tmp/coveragepy/coverage/control.py", line 681, in start
apply_patches(self, self.config)
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
File "/tmp/coveragepy/coverage/patch.py", line 82, in apply_patches
assert pth_file is not None
^^^^^^^^^^^^^^^^^^^^
AssertionError
Remainder of file ignored
pth_file=PosixPath('/usr/lib/python3.13/site-packages/subcover.pth')
it happened
pth_file=PosixPath('/tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth')
Combined data file .coverage.pomiot.138514.XzsHbdxxPrior to the commit in question, the output is instead:
pth_file=PosixPath('/tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth')
pth_file=PosixPath('/tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth')
Combined data file .coverage.pomiot.142231.XWEYKEix
Combined data file .coverage.pomiot.142232.XqBXkAix
Describe the bug
With 7.10.1, the tests seem to be failing on all Pythons. Bisect points to 2134e57.
The errors seem to all have roughly the same reason, and xdist doesn't seem relevant, i.e.:
To Reproduce
I have reproduced with CPython 3.11.13, 3.13.5, and PyPy3.11 7.3.20.
Expected behavior
Passing tests :-).
Additional context
If I add a some debug prints:
Then the output becomes:
Error processing line 1 of /tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth: Traceback (most recent call last): File "<frozen site>", line 207, in addpackage File "<string>", line 1, in <module> File "/tmp/coveragepy/coverage/control.py", line 1435, in process_startup cov.start() ~~~~~~~~~^^ File "/tmp/coveragepy/coverage/control.py", line 681, in start apply_patches(self, self.config) ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^ File "/tmp/coveragepy/coverage/patch.py", line 82, in apply_patches assert pth_file is not None ^^^^^^^^^^^^^^^^^^^^ AssertionError Remainder of file ignored pth_file=PosixPath('/usr/lib/python3.13/site-packages/subcover.pth') it happened pth_file=PosixPath('/tmp/coveragepy/.tox/py313/lib/python3.13/site-packages/subcover.pth') Combined data file .coverage.pomiot.138514.XzsHbdxxPrior to the commit in question, the output is instead: