// 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. /Users/r/go/src/pkg/runtime/debug/stack_test.go:15 (0x13878) (*T).ptrmethod: return Stack() /Users/r/go/src/pkg/runtime/debug/stack_test.go:18 (0x138dd) T.method: return t.ptrmethod() /Users/r/go/src/pkg/runtime/debug/stack_test.go:23 (0x13920) TestStack: b := T(0).method() /Users/r/go/src/pkg/testing/testing.go:132 (0x14a7a) tRunner: test.F(t) /Users/r/go/src/pkg/runtime/proc.c:145 (0xc970) ???: runtimeĀ·unlock(&runtimeĀ·sched); */ 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], line) n++ // The source might not be available while running the test. if strings.HasPrefix(lines[n], "\t") { check(t, lines[n], code) n++ } } frame("src/pkg/runtime/debug/stack_test.go", "\t(*T).ptrmethod: return Stack()") frame("src/pkg/runtime/debug/stack_test.go", "\tT.method: return t.ptrmethod()") frame("src/pkg/runtime/debug/stack_test.go", "\tTestStack: b := T(0).method()") frame("src/pkg/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) } }