Hook up a new test case at
testpath, similar to g_test_add_func().
A fixture data structure with setup and teardown functions may be provided,
similar to g_test_create_case().
g_test_add() is implemented as a macro, so that the fsetup(),
fteardown() callbacks can expect a
Fixture pointer as their first argument
in a type safe manner. They otherwise have type
|This function is not directly available to language bindings|