var errBuf bytes.Buffer

	for i, c := range cases {
		t.Run(fmt.Sprintf("case %d %s", i, c.version), func(t *testing.T) {
			k8sClient := kube.NewFakeClient()
			k8sClient.Kube().Discovery().(*fakediscovery.FakeDiscovery).FakedServerVersion = c.version

			logger := clog.NewConsoleLogger(&outBuf, &errBuf, nil)
			IsK8VersionSupported(k8sClient, logger)

			errMsgTrim := strings.TrimSpace(c.logMsg)

- kubeadm: JoinConfiguration now houses the discovery options in a nested Discovery structure, which in turn has a couple of other nested structures to house more specific options (BootstrapTokenDiscovery and FileDiscovery) ([#67763](https://github.com/kubernetes/kubernetes/pull/67763), [@rosti](https://github.com/rosti))