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import pytest
from rpython.rlib import rvmprof
class FakeVMProf(object):
def __init__(self):
self._enabled = False
self._ignore_signals = 1
# --- VMProf official API ---
# add fake methods as needed by the tests
def stop_sampling(self):
self._ignore_signals += 1
def start_sampling(self):
assert self._ignore_signals > 0, ('calling start_sampling() without '
'the corresponding stop_sampling()?')
self._ignore_signals -= 1
# --- FakeVMProf specific API ---
# this API is not part of rvmprof, but available only inside tests using
# fakevmprof
@property
def is_sampling_enabled(self):
return self._ignore_signals == 0
def check_status(self):
"""
To be called during test teardown
"""
if self._ignore_signals != 1:
msg = ('Invalid value for fakevmprof._ignore_signals: expected 1, '
'got %d. This probably means that you called '
'{start,stop}_sampling() a wrong number of times')
raise ValueError, msg % self._ignore_signals
@pytest.fixture
def fakevmprof(request, monkeypatch):
fake = FakeVMProf()
monkeypatch.setattr(rvmprof.rvmprof, '_vmprof_instance', fake)
request.addfinalizer(fake.check_status)
return fake
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