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: kubeconfig_test.go
    path of file: ./repos/kubernetes/staging/src/k8s.io/apiserver/pkg/admission/plugin/webhook/config
    
    the code of the file until where you have to start completion: /*
Copyright 2019 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
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 config

import (
	"bytes"
	"strings"
	"testing"
)

func TestLoadConfig(t *testing.T) {
	testcases := []struct {
		name             string
		input            string
		expectEr
    
func TestLoadConfig(t *testing.T) {
	testcases := []struct {
		name             string
		input            string
		expectErr        string
		expectKubeconfig string
	}{
		{
			name:      "empty",
			input:     "",
			expectErr: `'Kind' is missing in ''`,
		},
		{
			name:      "unknown kind",
			input:     `{"kind":"Unknown","apiVersion":"v1"}`,
			expectErr: `no kind "Unknown" is registered for version "v1"`,
		},
		{
			name: "valid v1alpha1",
			input: `
kind: WebhookAdmission
apiVersion: apiserver.config.k8s.io/v1alpha1
kubeConfigFile: /foo
`,
			expectKubeconfig: "/foo",
		},
		{
			name: "valid v1",
			input: `
kind: WebhookAdmissionConfiguration
apiVersion: apiserver.config.k8s.io/v1
kubeConfigFile: /foo
`,
			expectKubeconfig: "/foo",
		},
	}

	for _, tc := range testcases {
		t.Run(tc.name, func(t *testing.T) {
			kubeconfig, err := LoadConfig(bytes.NewBufferString(tc.input))
			if len(tc.expectErr) > 0 {
				if err == nil {
					t.Fatal("expected err, got none")
				}
				if !strings.Contains(err.Error(), tc.expectErr) {
					t.Fatalf("expected err containing %q, got %v", tc.expectErr, err)
				}
				return
			}
			if err != nil {
				t.Fatal(err)
			}
			if kubeconfig != tc.expectKubeconfig {
				t.Fatalf("expected %q, got %q", tc.expectKubeconfig, kubeconfig)
			}
		})
	}
}