if cert.CAName != "" && certMap[cert.CAName] == nil {
					t.Errorf("Certificate %q references nonexistent CA %q", cert.Name, cert.CAName)
				}
			}
		})
	}
}

func TestMakeCertTree(t *testing.T) {
	rootCert := &KubeadmCert{
		Name: "root",
	}
	leaf0 := &KubeadmCert{
		Name:   "leaf0",
		CAName: "root",
	}
	leaf1 := &KubeadmCert{
		Name:   "leaf1",
		CAName: "root",