libgo/go/runtime/debug/stack_test.go

   1 // Copyright 2011 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package debug_test
   6
   7 import (
   8         . "runtime/debug"
   9         "strings"
  10         "testing"
  11 )
  12
  13 type T int
  14
  15 func (t *T) ptrmethod() []byte {
  16         return Stack()
  17 }
  18 func (t T) method() []byte {
  19         return t.ptrmethod()
  20 }
  21
  22 /*
  23         The traceback should look something like this, modulo line numbers and hex constants.
  24         Don't worry much about the base levels, but check the ones in our own package.
  25
  26                 goroutine 10 [running]:
  27                 runtime/debug.Stack(0x0, 0x0, 0x0)
  28                         /Users/r/go/src/runtime/debug/stack.go:28 +0x80
  29                 runtime/debug.(*T).ptrmethod(0xc82005ee70, 0x0, 0x0, 0x0)
  30                         /Users/r/go/src/runtime/debug/stack_test.go:15 +0x29
  31                 runtime/debug.T.method(0x0, 0x0, 0x0, 0x0)
  32                         /Users/r/go/src/runtime/debug/stack_test.go:18 +0x32
  33                 runtime/debug.TestStack(0xc8201ce000)
  34                         /Users/r/go/src/runtime/debug/stack_test.go:37 +0x38
  35                 testing.tRunner(0xc8201ce000, 0x664b58)
  36                         /Users/r/go/src/testing/testing.go:456 +0x98
  37                 created by testing.RunTests
  38                         /Users/r/go/src/testing/testing.go:561 +0x86d
  39 */
  40 func TestStack(t *testing.T) {
  41         b := T(0).method()
  42         lines := strings.Split(string(b), "\n")
  43         if len(lines) < 6 {
  44                 t.Fatal("too few lines")
  45         }
  46         n := 0
  47         frame := func(line, code string) {
  48                 check(t, lines[n], code)
  49                 n++
  50                 check(t, lines[n], line)
  51                 n++
  52         }
  53         frame("stack_test.go", "\tmethod.N15_runtime_debug.T: return Stack()")
  54         frame("stack_test.go", "\tmethod.N15_runtime_debug.T: return t.ptrmethod()")
  55         frame("stack_test.go", "\tTestStack: b := T(0).method()")
  56         frame("testing/testing.go", "")
  57 }
  58
  59 func check(t *testing.T, line, has string) {
  60         if !strings.Contains(line, has) {
  61                 t.Errorf("expected %q in %q", has, line)
  62         }
  63 }