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: testgodefs_test.go
    path of file: ./repos/gccrs/libgo/misc/cgo/testgodefs
    
    the code of the file until where you have to start completion: // Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package testgodefs

import (
	"bytes"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
)

// We are testing cgo -godefs, which translates Go files that use
// import "C" into Go files with Go definitions of types defined in the
// import "C" block.  Add more tests here.
var filePrefixes = []string{
	"anonunion",
	"bitfields",
	"issue8478",
	"fieldtypedef",
	"issue37479",
	"issue37621",
	"issue38649",
	"issue39534",
	"issue48396",
}

func TestGoDefs(t *testing.T) {
	testdata, err := filepath.Abs("testdata")
	if err != nil {
		t.Fatal(err)
	}

	gopath, err := os.MkdirTemp("", "testgodefs-gopath")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(gopath)

	dir := filepath.Join(gopath, "src", "testgodefs")
	if err := os.MkdirAll(dir, 0755); err != nil {
		t.Fatal(err)
	}

	for _,
    
func TestGoDefs(t *testing.T) {
	testdata, err := filepath.Abs("testdata")
	if err != nil {
		t.Fatal(err)
	}

	gopath, err := os.MkdirTemp("", "testgodefs-gopath")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(gopath)

	dir := filepath.Join(gopath, "src", "testgodefs")
	if err := os.MkdirAll(dir, 0755); err != nil {
		t.Fatal(err)
	}

	for _, fp := range filePrefixes {
		cmd := exec.Command("go", "tool", "cgo",
			"-godefs",
			"-srcdir", testdata,
			"-objdir", dir,
			fp+".go")
		cmd.Stderr = new(bytes.Buffer)

		out, err := cmd.Output()
		if err != nil {
			t.Fatalf("%s: %v\n%s", strings.Join(cmd.Args, " "), err, cmd.Stderr)
		}

		if err := os.WriteFile(filepath.Join(dir, fp+"_defs.go"), out, 0644); err != nil {
			t.Fatal(err)
		}
	}

	main, err := os.ReadFile(filepath.Join("testdata", "main.go"))
	if err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(dir, "main.go"), main, 0644); err != nil {
		t.Fatal(err)
	}

	if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte("module testgodefs\ngo 1.14\n"), 0644); err != nil {
		t.Fatal(err)
	}

	// Use 'go run' to build and run the resulting binary in a single step,
	// instead of invoking 'go build' and the resulting binary separately, so that
	// this test can pass on mobile builders, which do not copy artifacts back
	// from remote invocations.
	cmd := exec.Command("go", "run", ".")
	cmd.Env = append(os.Environ(), "GOPATH="+gopath)
	cmd.Dir = dir
	if out, err := cmd.CombinedOutput(); err != nil {
		t.Fatalf("%s [%s]: %v\n%s", strings.Join(cmd.Args, " "), dir, err, out)
	}
}