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: checkptr_test.go
    path of file: ./repos/gccrs/libgo/go/runtime
    
    the code of the file until where you have to start completion: // Copyright 2020 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 runtime_test

import (
	"internal/testenv"
	"os/exec"
	"runtime"
	"strings"
	"testing"
)

func TestCheckPtr(t *testing.T) {
	if runtime.Compiler == "gccgo" {
		t.Skip("gccgo does not have -d=checkptr")
	}

	// This test requires rebuilding packages with -d=checkptr=1,
	// so it's somewhat slow.
	if testing.Short() {
		t.Skip("skipping test in -short mode")
	}

	t.Parallel()
	testenv.MustHaveGoRun(t)

	exe, err := buildTestProg(t, "testprog", "-gcflags=all=-d=checkptr=1")
	if err != nil {
		t.Fatal(err)
	}

	testCases := []struct {
		cmd  string
		want string
	}{
		{"CheckPtrAlignmentPtr", "fatal error: checkptr: misaligned pointer conversion\n"},
		{"CheckPtrAlign
    
func TestCheckPtr2(t *testing.T) {
	// This test requires rebuilding packages with -d=checkptr=2,
	// so it's somewhat slow.
	if testing.Short() {
		t.Skip("skipping test in -short mode")
	}

	t.Parallel()
	testenv.MustHaveGoRun(t)

	exe, err := buildTestProg(t, "testprog", "-gcflags=all=-d=checkptr=2")
	if err != nil {
		t.Fatal(err)
	}

	testCases := []struct {
		cmd  string
		want string
	}{
		{"CheckPtrAlignmentNested", "fatal error: checkptr: converted pointer straddles multiple allocations\n"},
	}

	for _, tc := range testCases {
		tc := tc
		t.Run(tc.cmd, func(t *testing.T) {
			t.Parallel()
			got, err := testenv.CleanCmdEnv(exec.Command(exe, tc.cmd)).CombinedOutput()
			if err != nil {
				t.Log(err)
			}
			if tc.want == "" {
				if len(got) > 0 {
					t.Errorf("output:\n%s\nwant no output", got)
				}
				return
			}
			if !strings.HasPrefix(string(got), tc.want) {
				t.Errorf("output:\n%s\n\nwant output starting with: %s", got, tc.want)
			}
		})
	}
}