def test_context_manager(self, cache):
""" ensure the context manager reverts changes """
context = corr._Context(cache, 'default')
old_default = cache['default']
new_val = corr.numpy_normxcorr
with context(new_val):
assert cache['default'] == new_val
assert old_default
def set_xcorr(self, cache):
return corr._Context(cache, 'default')