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: errors_test.go
    path of file: ./repos/v8go
    
    the code of the file until where you have to start completion: // Copyright 2019 Roger Chapman and the v8go contributors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package v8go_test

import (
	"fmt"
	"testing"

	v8 "rogchap.com/v8go"
)

func TestJSErrorFormat(t *testing.T) {
	t.Parallel()
	tests := [...]struct {
		name            string
		err             error
		defaultVerb     string
		defaultVerbFlag string
		stringVerb      string
		quoteVerb       string
	}{
		{"W
    
func TestJSErrorFormat_forSyntaxError(t *testing.T) {
	t.Parallel()
	iso := v8.NewIsolate()
	defer iso.Dispose()
	ctx := v8.NewContext(iso)
	defer ctx.Close()

	script := `
		let x = 1;
		let y = x + ;
		let z = x + z;
	`
	_, err := ctx.RunScript(script, "xyz.js")
	jsErr := err.(*v8.JSError)
	if jsErr.StackTrace != jsErr.Message {
		t.Errorf("unexpected StackTrace %q not equal to Message %q", jsErr.StackTrace, jsErr.Message)
	}
	if jsErr.Location == "" {
		t.Errorf("missing Location")
	}

	msg := fmt.Sprintf("%+v", err)
	if msg != "SyntaxError: Unexpected token ';' (at xyz.js:3:15)" {
		t.Errorf("unexpected verbose error message: %q", msg)
	}
}