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: flag_test.go
    path of file: ./repos/vault/helper/flag-kv
    
    the code of the file until where you have to start completion: // Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

package kvFlag

import (
	"flag"
	"reflect"
	"testing"
)

func TestFlag_impl(t *testing.T) {
	var _ flag.Value = new(Flag)
}

func TestFlag(t *testing.T) {
	cases := []struct {
		Input  string
		Output map[string]string
		Error  bool
	}{
		{
			"key=value",
			map[string]string{"key": "value"},
			false,
		},

		{
			"key=",
			map[string]string{"key": ""},
			false,
		},

		{
			"key=foo=bar",
			map[string]string{"key": "foo=bar"},
			false,
		},

		{
			"key",
			nil,
			true,
		},
	}

	for _, tc := range cases {
		f := n
    
func TestFlag(t *testing.T) {
	cases := []struct {
		Input  string
		Output map[string]string
		Error  bool
	}{
		{
			"key=value",
			map[string]string{"key": "value"},
			false,
		},

		{
			"key=",
			map[string]string{"key": ""},
			false,
		},

		{
			"key=foo=bar",
			map[string]string{"key": "foo=bar"},
			false,
		},

		{
			"key",
			nil,
			true,
		},
	}

	for _, tc := range cases {
		f := new(Flag)
		err := f.Set(tc.Input)
		if (err != nil) != tc.Error {
			t.Fatalf("bad error. Input: %#v", tc.Input)
		}

		actual := map[string]string(*f)
		if !reflect.DeepEqual(actual, tc.Output) {
			t.Fatalf("bad: %#v", actual)
		}
	}
}