/**
* failtest_hook - whether a certain call should fail or not.
* @history: the ordered history of all failtest calls.
* @num: the number of elements in @history (greater than 0)
*
* The default value of this hook is failtest_default_hook(), which returns
/**
* failtest_hook - whether a certain call should fail or not.
* @history: the ordered history of all failtest calls.
* @num: the number of elements in @history (greater than 0)
*
* The default value of this hook is failtest_default_hook(), which returns