EXPECT_PID_REACHES_STATES
#define EXPECT_PID_ALIVE(pid) EXPECT_PID_REACHES_STATES(pid, 'R', 'S')
#define EXPECT_PID_DEAD(pid) EXPECT_PID_REACHES_STATES(pid, 'Z', '\0')
#define EXPECT_PID_ZOMBIE(pid) EXPECT_PID_REACHES_STATES(pid, 'Z', 'Z');
#define EXPECT_PID_GONE(pid) EXPECT_PID_REACHES_STATES(pid, '\0', '\0');