func runKubeadmInit(t testing.TB, args ...string) (string, string, int, error) {
	t.Helper()
	t.Setenv("KUBEADM_INIT_DRYRUN_DIR", os.TempDir())
	kubeadmPath := getKubeadmPath()
	kubeadmArgs := []string{"init", "--dry-run", "--ignore-preflight-errors=all"}
	kubeadmArgs = append(kubeadmArgs, args...)
	return RunCmd(kubeadmPath, kubeadmArgs...)
}

func getKubeadmVersion() *version.Version {
	kubeadmPath := getKubeadmPath()

* `max_age` - Sets a maximum time in seconds for browsers to cache CORS responses. Defaults to `600`.

The middleware responds to two particular types of HTTP request...

### CORS preflight requests

These are any `OPTIONS` request with `Origin` and `Access-Control-Request-Method` headers.

		if err := migrateCoreDNSCorefile(client, coreDNSConfigMap, corefile, currentInstalledCoreDNSVersion); err != nil {
			// Errors in Corefile Migration is verified during preflight checks. This part will be executed when a user has chosen
			// to ignore preflight check errors.
			canMigrateCorefile = false
			klog.Warningf("the CoreDNS Configuration was not migrated: %v. The existing CoreDNS Corefile configuration has been retained.", err)

		Use:   "diff [version]",
		Short: "Show what differences would be applied to existing static pod manifests. See also: kubeadm upgrade apply --dry-run",
		RunE: func(cmd *cobra.Command, args []string) error {
			// Run preflight checks for diff to check that the manifests already exist.
			if err := validateManifestsPath(
				flags.apiServerManifestPath,
				flags.controllerManagerManifestPath,
				flags.schedulerManifestPath); err != nil {

		{[]string{"--foo=bar"}, true},
		{[]string{"--config=hello"}, true},
		{[]string{"--config=hello", "--ignore-preflight-errors=all"}, true},
		// Expected to succeed, --config is mixed with skip-* flags only or no other flags
		{[]string{"--config=hello", "--skip-token-print=true"}, true},
		{[]string{"--config=hello", "--ignore-preflight-errors=baz", "--skip-token-print"}, true},
		// Expected to fail, --config is mixed with the --foo flag

	return d.client
}

// PatchesDir returns the folder where patches for components are stored
func (d *nodeData) PatchesDir() string {
	return d.patchesDir
}

// IgnorePreflightErrors returns the list of preflight errors to ignore.
func (d *nodeData) IgnorePreflightErrors() sets.Set[string] {
	return d.ignorePreflightErrors
}

// KubeConfigPath returns the path to the user kubeconfig file.

	return r.forceReset
}

// InputReader returns the io.reader used to read messages.
func (r *resetData) InputReader() io.Reader {
	return r.inputReader
}

// IgnorePreflightErrors returns the list of preflight errors to ignore.
func (r *resetData) IgnorePreflightErrors() sets.Set[string] {
	return r.ignorePreflightErrors
}

// CRISocketPath returns the criSocketPath.
func (r *resetData) CRISocketPath() string {

		}
	}

	return allErrs
}

// ValidateIgnorePreflightErrors validates duplicates in:
// - ignore-preflight-errors flag and
// - ignorePreflightErrors field in {Init,Join}Configuration files.
func ValidateIgnorePreflightErrors(ignorePreflightErrorsFromCLI, ignorePreflightErrorsFromConfigFile []string) (sets.Set[string], error) {

- Kubeadm: during the preflight check "CreateJob" of "kubeadm upgrade", check if there are no nodes where a Pod can schedule. If there are none, show a warning and skip this preflight check. This can happen in single node clusters where the only node was drained. ([#124503](https://github.com/kubernetes/kubernetes/pull/124503), [@neolit123](https://gi...

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package preflight

import (
	"bytes"
	"fmt"
	"net"
	"net/http"
	"os"
	"runtime"
	"strings"
	"testing"

	utiltesting "k8s.io/client-go/util/testing"

	"github.com/google/go-cmp/cmp"