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: gccgoinstallation_test.go
    path of file: ./repos/lgo/vendor/go/internal/gccgoimporter
    
    the code of the file until where you have to start completion: // Copyright 2013 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 gccgoimporter

import (
	"go/types"
	"testing"
)

// importablePackages is a list of packages that
    
func TestInstallationImporter(t *testing.T) {
	// This test relies on gccgo being around.
	gpath := gccgoPath()
	if gpath == "" {
		t.Skip("This test needs gccgo")
	}

	var inst GccgoInstallation
	err := inst.InitFromDriver(gpath)
	if err != nil {
		t.Fatal(err)
	}
	imp := inst.GetImporter(nil, nil)

	// Ensure we don't regress the number of packages we can parse. First import
	// all packages into the same map and then each individually.
	pkgMap := make(map[string]*types.Package)
	for _, pkg := range importablePackages {
		_, err = imp(pkgMap, pkg, ".", nil)
		if err != nil {
			t.Error(err)
		}
	}

	for _, pkg := range importablePackages {
		_, err = imp(make(map[string]*types.Package), pkg, ".", nil)
		if err != nil {
			t.Error(err)
		}
	}

	// Test for certain specific entities in the imported data.
	for _, test := range [...]importerTest{
		{pkgpath: "io", name: "Reader", want: "type Reader interface{Read(p []byte) (n int, err error)}"},
		{pkgpath: "io", name: "ReadWriter", want: "type ReadWriter interface{Reader; Writer}"},
		{pkgpath: "math", name: "Pi", want: "const Pi untyped float"},
		{pkgpath: "math", name: "Sin", want: "func Sin(x float64) float64"},
		{pkgpath: "sort", name: "Ints", want: "func Ints(a []int)"},
		{pkgpath: "unsafe", name: "Pointer", want: "type Pointer"},
	} {
		runImporterTest(t, imp, nil, &test)
	}
}