require.Equal(t, strings.Repeat("a", 80)+"\na\n> ", out.String())
require.NoError(t, unix.IoctlSetWinsize(fd, unix.TIOCSWINSZ, &unix.Winsize{Col: 40}))
require.Equal(t, 40, terminalColumns(&out))
require.Equal(t, strings.Repeat("a", 80)+"\na\n> ", out.String())
require.NoError(t, unix.IoctlSetWinsize(fd, unix.TIOCSWINSZ, &unix.Winsize{Col: 40}))
require.Equal(t, 40, terminalColumns(&out))