// Copyright 2011 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 debug import (	"strings"	"testing") type T int func (t *T) ptrmethod() []byte {	return Stack()}func (t T) method() []byte {	return t.ptrmethod()} /*	The traceback should look something like this, modulo line numbers and hex constants.	Don't worry much about the base levels, but check the ones in our own package. 		goroutine 10 [running]:		runtime/debug.Stack(0x0, 0x0, 0x0)			/Users/r/go/src/runtime/debug/stack.go:28 +0x80		runtime/debug.(*T).ptrmethod(0xc82005ee70, 0x0, 0x0, 0x0)			/Users/r/go/src/runtime/debug/stack_test.go:15 +0x29		runtime/debug.T.method(0x0, 0x0, 0x0, 0x0)			/Users/r/go/src/runtime/debug/stack_test.go:18 +0x32		runtime/debug.TestStack(0xc8201ce000)			/Users/r/go/src/runtime/debug/stack_test.go:37 +0x38		testing.tRunner(0xc8201ce000, 0x664b58)			/Users/r/go/src/testing/testing.go:456 +0x98		created by testing.RunTests			/Users/r/go/src/testing/testing.go:561 +0x86d*/func TestStack(t *testing.T) {	b := T(0).method()	lines := strings.Split(string(b), "\n")	if len(lines) < 6 {		t.Fatal("too few lines")	}	n := 0	frame := func(line, code string) {		check(t, lines[n], code)		n++		check(t, lines[n], line)		n++	}	n++	frame("src/runtime/debug/stack.go", "runtime/debug.Stack")	frame("src/runtime/debug/stack_test.go", "runtime/debug.(*T).ptrmethod")	frame("src/runtime/debug/stack_test.go", "runtime/debug.T.method")	frame("src/runtime/debug/stack_test.go", "runtime/debug.TestStack")	frame("src/testing/testing.go", "")} func check(t *testing.T, line, has string) {	if strings.Index(line, has) < 0 {		t.Errorf("expected %q in %q", has, line)	}}