Assert that the stderr output of the last test subprocess
serrpattern. See g_test_trap_subprocess().
This is sometimes used to test situations that are formally
considered to be undefined behaviour, like code that hits a
g_assert() or g_error(). In these situations you should skip the
entire test, including the call to g_test_trap_subprocess(), unless
TRUE to indicate that undefined
behaviour may be tested.
Available since: 2.16
This function is not directly available to language bindings.