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"""
Small utilities for testing.
"""
import os
import gc
import sys
from joblib._multiprocessing_helpers import mp
from joblib.testing import SkipTest, skipif
try:
import lz4
except ImportError:
lz4 = None
IS_PYPY = hasattr(sys, "pypy_version_info")
# A decorator to run tests only when numpy is available
try:
import numpy as np
def with_numpy(func):
"""A decorator to skip tests requiring numpy."""
return func
except ImportError:
def with_numpy(func):
"""A decorator to skip tests requiring numpy."""
def my_func():
raise SkipTest('Test requires numpy')
return my_func
np = None
# TODO: Turn this back on after refactoring yield based tests in test_hashing
# with_numpy = skipif(not np, reason='Test requires numpy.')
# we use memory_profiler library for memory consumption checks
try:
from memory_profiler import memory_usage
def with_memory_profiler(func):
"""A decorator to skip tests requiring memory_profiler."""
return func
def memory_used(func, *args, **kwargs):
"""Compute memory usage when executing func."""
gc.collect()
mem_use = memory_usage((func, args, kwargs), interval=.001)
return max(mem_use) - min(mem_use)
except ImportError:
def with_memory_profiler(func):
"""A decorator to skip tests requiring memory_profiler."""
def dummy_func():
raise SkipTest('Test requires memory_profiler.')
return dummy_func
memory_usage = memory_used = None
def force_gc_pypy():
# The gc in pypy can be delayed. Force it to test the behavior when it
# will eventually be collected.
if IS_PYPY:
# Run gc.collect() twice to make sure the weakref is collected, as
# mentionned in the pypy doc:
# https://doc.pypy.org/en/latest/config/objspace.usemodules._weakref.html
import gc
gc.collect()
gc.collect()
with_multiprocessing = skipif(
mp is None, reason='Needs multiprocessing to run.')
with_dev_shm = skipif(
not os.path.exists('/dev/shm'),
reason='This test requires a large /dev/shm shared memory fs.')
with_lz4 = skipif(lz4 is None, reason='Needs lz4 compression to run')
without_lz4 = skipif(
lz4 is not None, reason='Needs lz4 not being installed to run')
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