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import sys
import pytest
def test_enabled(testdir):
"""Test single crashing test displays a traceback."""
testdir.makepyfile(
"""
import faulthandler
def test_crash():
faulthandler._sigabrt()
"""
)
result = testdir.runpytest_subprocess()
result.stderr.fnmatch_lines(["*Fatal Python error*"])
assert result.ret != 0
def test_crash_near_exit(testdir):
"""Test that fault handler displays crashes that happen even after
pytest is exiting (for example, when the interpreter is shutting down).
"""
testdir.makepyfile(
"""
import faulthandler
import atexit
def test_ok():
atexit.register(faulthandler._sigabrt)
"""
)
result = testdir.runpytest_subprocess()
result.stderr.fnmatch_lines(["*Fatal Python error*"])
assert result.ret != 0
def test_disabled(testdir):
"""Test option to disable fault handler in the command line.
"""
testdir.makepyfile(
"""
import faulthandler
def test_disabled():
assert not faulthandler.is_enabled()
"""
)
result = testdir.runpytest_subprocess("-p", "no:faulthandler")
result.stdout.fnmatch_lines(["*1 passed*"])
assert result.ret == 0
@pytest.mark.parametrize("enabled", [True, False])
def test_timeout(testdir, enabled):
"""Test option to dump tracebacks after a certain timeout.
If faulthandler is disabled, no traceback will be dumped.
"""
testdir.makepyfile(
"""
import time
def test_timeout():
time.sleep(0.1)
"""
)
testdir.makeini(
"""
[pytest]
faulthandler_timeout = 0.01
"""
)
args = ["-p", "no:faulthandler"] if not enabled else []
result = testdir.runpytest_subprocess(*args)
tb_output = "most recent call first"
if sys.version_info[:2] == (3, 3):
tb_output = "Thread"
if enabled:
result.stderr.fnmatch_lines(["*%s*" % tb_output])
else:
assert tb_output not in result.stderr.str()
result.stdout.fnmatch_lines(["*1 passed*"])
assert result.ret == 0
@pytest.mark.parametrize("hook_name", ["pytest_enter_pdb", "pytest_exception_interact"])
def test_cancel_timeout_on_hook(monkeypatch, pytestconfig, hook_name):
"""Make sure that we are cancelling any scheduled traceback dumping due
to timeout before entering pdb (pytest-dev/pytest-faulthandler#12) or any other interactive
exception (pytest-dev/pytest-faulthandler#14).
"""
import faulthandler
from _pytest import faulthandler as plugin_module
called = []
monkeypatch.setattr(
faulthandler, "cancel_dump_traceback_later", lambda: called.append(1)
)
# call our hook explicitly, we can trust that pytest will call the hook
# for us at the appropriate moment
hook_func = getattr(plugin_module, hook_name)
hook_func()
assert called == [1]
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