Function reservePort

command/ca/health_test.go:26–39

reservePort "reserves" a TCP port by opening a listener on a random port and immediately closing it. The port can then be assumed to be available for running a server on.

(t *testing.T)

// port and immediately closing it. The port can then be assumed to be
// available for running a server on.
func reservePort(t *testing.T) (host, port string) {
	t.Helper()
	l, err := net.Listen("tcp", ":0")
	require.NoError(t, err)

	address := l.Addr().String()
	err = l.Close()
	require.NoError(t, err)

	host, port, err = net.SplitHostPort(address)
	require.NoError(t, err)

	return
}

func Test_healthAction(t *testing.T) {
	dir := t.TempDir()