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"""
This module contains some assorted functions used in tests
"""
import os
import libxml2
from scrapy.selector.document import Libxml2Document
def libxml2debug(testfunction):
"""Decorator for debugging libxml2 memory leaks inside a function.
We've found libxml2 memory leaks are something very weird, and can happen
sometimes depending on the order where tests are run. So this decorator
enables libxml2 memory leaks debugging only when the environment variable
LIBXML2_DEBUGLEAKS is set.
"""
def newfunc(*args, **kwargs):
libxml2.debugMemory(1)
testfunction(*args, **kwargs)
libxml2.cleanupParser()
leaked_bytes = libxml2.debugMemory(0)
assert leaked_bytes == 0, "libxml2 memory leak detected: %d bytes" % leaked_bytes
if 'LIBXML2_DEBUGLEAKS' in os.environ:
return newfunc
else:
return testfunction
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