You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: operation_certificaterotation_test.go
    path of file: ./repos/rancher/tests/v2prov/tests/custom
    
    the code of the file until where you have to start completion: package custom

import (
	"github.com/rancher/rancher/tests/v2prov/operations"
	"testing"

	provisioningv1 "github.com/rancher/rancher/pkg/apis/provisioning.cattle.io/v1"
	"github.com/rancher/rancher/tests/v2prov/clients"
	"github.com/rancher/rancher/tests/v2prov/cluster"
	"github.com/rancher/rancher/tests/v2prov/systemdnode"
	"github.com/stretchr/testify/assert"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

func Test_Operation_SetA_Custom_CertificateRotation(t *testing.T) {
	clients, err := clients.New()
	if err != nil {
		t.Fatal(err)
	}
	defer clients.Close()

	c, err := cluster.New(clients, &provisioningv1.Cluster{
		ObjectMeta: metav1.ObjectMeta{
			Name: "test-custom-certificate-rotation-operations",
		},
		Spec: provisioningv1.ClusterSpec{
			RKEConfig: &provisioningv1.RKEConfig{},
		},
	})
	if err != nil {
		t.Fatal(err)
	}

	command, err := cluster.CustomCo
    
func Test_Operation_SetA_Custom_CertificateRotation(t *testing.T) {
	clients, err := clients.New()
	if err != nil {
		t.Fatal(err)
	}
	defer clients.Close()

	c, err := cluster.New(clients, &provisioningv1.Cluster{
		ObjectMeta: metav1.ObjectMeta{
			Name: "test-custom-certificate-rotation-operations",
		},
		Spec: provisioningv1.ClusterSpec{
			RKEConfig: &provisioningv1.RKEConfig{},
		},
	})
	if err != nil {
		t.Fatal(err)
	}

	command, err := cluster.CustomCommand(clients, c)
	if err != nil {
		t.Fatal(err)
	}

	assert.NotEmpty(t, command)

	_, err = systemdnode.New(clients, c.Namespace, "#!/usr/bin/env sh\n"+command+" --controlplane", map[string]string{"custom-cluster-name": c.Name}, nil)
	if err != nil {
		t.Fatal(err)
	}

	_, err = systemdnode.New(clients, c.Namespace, "#!/usr/bin/env sh\n"+command+" --etcd", map[string]string{"custom-cluster-name": c.Name}, nil)
	if err != nil {
		t.Fatal(err)
	}

	_, err = systemdnode.New(clients, c.Namespace, "#!/usr/bin/env sh\n"+command+" --worker", map[string]string{"custom-cluster-name": c.Name}, nil)
	if err != nil {
		t.Fatal(err)
	}

	_, err = cluster.WaitForCreate(clients, c)
	if err != nil {
		t.Fatal(err)
	}

	operations.RunCertificateRotationTest(t, clients, c)

	err = cluster.EnsureMinimalConflictsWithThreshold(clients, c, cluster.SaneConflictMessageThreshold)
	assert.NoError(t, err)
}