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: internal_test.go
    path of file: ./repos/rclone/fs/config/configstruct
    
    the code of the file until where you have to start completion: package configstruct

import (
	"fmt"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestCamelToSnake(t *testing.T) {
	for _, test := range []struct {
		in   string
		want string
	}{
		{"", ""},
		{"Type", "type"},
		{"AuthVersion", "auth_version"},
		{"AccessKeyID", "acces
    
func TestStringToInterface(t *testing.T) {
	item := struct{ A int }{2}
	for _, test := range []struct {
		in   string
		def  interface{}
		want interface{}
		err  string
	}{
		{"", string(""), "", ""},
		{"   string   ", string(""), "   string   ", ""},
		{"123", int(0), int(123), ""},
		{"0x123", int(0), int(0x123), ""},
		{"   0x123   ", int(0), int(0x123), ""},
		{"-123", int(0), int(-123), ""},
		{"0", false, false, ""},
		{"1", false, true, ""},
		{"FALSE", false, false, ""},
		{"true", false, true, ""},
		{"123", uint(0), uint(123), ""},
		{"123", int64(0), int64(123), ""},
		{"123x", int64(0), nil, "parsing \"123x\" as int64 failed: expected newline"},
		{"truth", false, nil, "parsing \"truth\" as bool failed: syntax error scanning boolean"},
		{"struct", item, nil, "parsing \"struct\" as struct { A int } failed: can't scan type: *struct { A int }"},
	} {
		what := fmt.Sprintf("parse %q as %T", test.in, test.def)
		got, err := StringToInterface(test.def, test.in)
		if test.err == "" {
			require.NoError(t, err, what)
			assert.Equal(t, test.want, got, what)
		} else {
			assert.Nil(t, got)
			assert.EqualError(t, err, test.err, what)
		}
	}
}