APIServer: kubeadmapiv1.APIServer{
					CertSANs: test.in,
				},
			}

			LowercaseSANs(cfg.APIServer.CertSANs)

			if len(cfg.APIServer.CertSANs) != len(test.out) {
				t.Fatalf("expected %d elements, got %d", len(test.out), len(cfg.APIServer.CertSANs))
			}

			for i, expected := range test.out {
				if cfg.APIServer.CertSANs[i] != expected {

	if err := Convert_v1beta3_ControlPlaneComponent_To_kubeadm_ControlPlaneComponent(&in.ControlPlaneComponent, &out.ControlPlaneComponent, s); err != nil {
		return err
	}
	out.CertSANs = *(*[]string)(unsafe.Pointer(&in.CertSANs))
	out.TimeoutForControlPlane = (*v1.Duration)(unsafe.Pointer(in.TimeoutForControlPlane))
	return nil
}

func (in *APIServer) DeepCopyInto(out *APIServer) {
	*out = *in
	in.ControlPlaneComponent.DeepCopyInto(&out.ControlPlaneComponent)
	if in.CertSANs != nil {
		in, out := &in.CertSANs, &out.CertSANs
		*out = make([]string, len(*in))
		copy(*out, *in)
	}
	if in.TimeoutForControlPlane != nil {
		in, out := &in.TimeoutForControlPlane, &out.TimeoutForControlPlane
		*out = new(v1.Duration)

}

// APIServer holds settings necessary for API server deployments in the cluster
type APIServer struct {
	ControlPlaneComponent `json:",inline"`

	// CertSANs sets extra Subject Alternative Names for the API Server signing cert.
	// +optional
	CertSANs []string `json:"certSANs,omitempty"`

	// TimeoutForControlPlane controls the timeout that we use for API server to appear
	// +optional

func (in *APIServer) DeepCopyInto(out *APIServer) {
	*out = *in
	in.ControlPlaneComponent.DeepCopyInto(&out.ControlPlaneComponent)
	if in.CertSANs != nil {
		in, out := &in.CertSANs, &out.CertSANs
		*out = make([]string, len(*in))
		copy(*out, *in)
	}
	return
}

// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new APIServer.

}

// APIServer holds settings necessary for API server deployments in the cluster
type APIServer struct {
	ControlPlaneComponent `json:",inline"`

	// CertSANs sets extra Subject Alternative Names for the API Server signing cert.
	// +optional
	CertSANs []string `json:"certSANs,omitempty"`
}

// DNS defines the DNS addon that should be used in the cluster
type DNS struct {

					ControlPlaneEndpoint: "api.k8s.io:6443",
					Networking:           kubeadmapi.Networking{ServiceSubnet: "10.96.0.0/12", DNSDomain: "cluster.local"},
					APIServer: kubeadmapi.APIServer{
						CertSANs: []string{"10.1.245.94", "10.1.245.95", "1.2.3.L", "invalid,commas,in,DNS"},
					},
				},
				NodeRegistration: kubeadmapi.NodeRegistrationOptions{Name: "valid-hostname"},
			},

	if err := Convert_v1beta4_ControlPlaneComponent_To_kubeadm_ControlPlaneComponent(&in.ControlPlaneComponent, &out.ControlPlaneComponent, s); err != nil {
		return err
	}
	out.CertSANs = *(*[]string)(unsafe.Pointer(&in.CertSANs))
	return nil
}

// Convert_v1beta4_APIServer_To_kubeadm_APIServer is an autogenerated conversion function.

	flagSet.StringVar(
		&cfg.CertificatesDir, options.CertificatesDir, cfg.CertificatesDir,
		`The path where to save and store the certificates.`,
	)
	flagSet.StringSliceVar(
		&cfg.APIServer.CertSANs, options.APIServerCertSANs, cfg.APIServer.CertSANs,
		`Optional extra Subject Alternative Names (SANs) to use for the API Server serving certificate. Can be both IP addresses and DNS names.`,
	)

	ExtraEnvs []EnvVar
}

// APIServer holds settings necessary for API server deployments in the cluster
type APIServer struct {
	ControlPlaneComponent

	// CertSANs sets extra Subject Alternative Names for the API Server signing cert.
	CertSANs []string

	// TimeoutForControlPlane controls the timeout that we use for API server to appear
	TimeoutForControlPlane *metav1.Duration
}