clearenv
int clearenv(void);
ATF_CHECK(clearenv() == 0);
ATF_CHECK(clearenv() == 0);
ATF_CHECK(clearenv() == 0);
ATF_CHECK(clearenv() == 0);
ATF_CHECK(clearenv() == 0);
ATF_CHECK(clearenv() == 0);
ATF_CHECK(clearenv() == 0);
ATF_CHECK(clearenv() == 0);
ATF_CHECK(clearenv() == 0);