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: parser_test.go
    path of file: ./repos/gonum/graph/formats/dot/internal/parser
    
    the code of the file until where you have to start completion: // This file is dual licensed under CC0 and The Gonum License.
//
// Copyright ©2017 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//
// Copyright ©2017 Robin Eklind.
// This file is made available under a Creative Commons CC0 1.0
// Universal Public Domain Dedication.

package parser_test

import (
	"archive/zip"
	"bytes"
	"os"
	"testing"

	"gonum.org/v1/gonum/graph/formats/dot"
)

func TestParseFile(t *testing.T) {
	golden := []struct {
		in  string
		out string
	}{
		{in: "../testdata/empty.dot"},
		{in: "../testdata/graph.dot"},
		{in: "../testdata/digraph.dot"},
		{in: "../testdata/strict.dot"},
		{in: "../testdata/multi.dot"},
		{in: "../testdata/named_graph.dot"},
		{in: "../testdata/node_stmt.dot"},
		{in: "../testdata/edge_stmt.dot"},
		{in: "../testdata/attr_stmt.dot"},
		{in: "../testdata/attr.dot"},
		{
			in:  "../testdata/subgraph.dot",
			out: "../testdata/subgraph.golden",
		},
		{
			in:  "../testdata/semi.dot",
			out: "../testdata/semi.golden",
		},
		{
			in:  "../testdata/empty_attr.dot",
			out: "../testdata
    
func TestParseFile(t *testing.T) {
	golden := []struct {
		in  string
		out string
	}{
		{in: "../testdata/empty.dot"},
		{in: "../testdata/graph.dot"},
		{in: "../testdata/digraph.dot"},
		{in: "../testdata/strict.dot"},
		{in: "../testdata/multi.dot"},
		{in: "../testdata/named_graph.dot"},
		{in: "../testdata/node_stmt.dot"},
		{in: "../testdata/edge_stmt.dot"},
		{in: "../testdata/attr_stmt.dot"},
		{in: "../testdata/attr.dot"},
		{
			in:  "../testdata/subgraph.dot",
			out: "../testdata/subgraph.golden",
		},
		{
			in:  "../testdata/semi.dot",
			out: "../testdata/semi.golden",
		},
		{
			in:  "../testdata/empty_attr.dot",
			out: "../testdata/empty_attr.golden",
		},
		{
			in:  "../testdata/attr_lists.dot",
			out: "../testdata/attr_lists.golden",
		},
		{
			in:  "../testdata/attr_sep.dot",
			out: "../testdata/attr_sep.golden",
		},
		{in: "../testdata/subgraph_vertex.dot"},
		{in: "../testdata/port.dot"},
		{in: "../testdata/quoted_id.dot"},
		{
			in:  "../testdata/backslash_newline_id.dot",
			out: "../testdata/backslash_newline_id.golden",
		},
	}
	for _, g := range golden {
		file, err := dot.ParseFile(g.in)
		if err != nil {
			t.Errorf("%q: unable to parse file; %v", g.in, err)
			continue
		}
		// If no output path is specified, the input is already golden.
		out := g.in
		if len(g.out) > 0 {
			out = g.out
		}
		buf, err := os.ReadFile(out)
		if err != nil {
			t.Errorf("%q: unable to read file; %v", g.in, err)
			continue
		}
		got := file.String()
		// Remove trailing newline.
		want := string(bytes.TrimSpace(buf))
		if got != want {
			t.Errorf("%q: graph mismatch; expected `%s`, got `%s`", g.in, want, got)
		}
	}
}