stack_test.go

Documentation: runtime/debug

		 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  	n++
		54  	frame("src/runtime/debug/stack.go", "runtime/debug.Stack")
		55  	frame("src/runtime/debug/stack_test.go", "runtime/debug_test.(*T).ptrmethod")
		56  	frame("src/runtime/debug/stack_test.go", "runtime/debug_test.T.method")
		57  	frame("src/runtime/debug/stack_test.go", "runtime/debug_test.TestStack")
		58  	frame("src/testing/testing.go", "")
		59  }
		60  
		61  func check(t *testing.T, line, has string) {
		62  	if !strings.Contains(line, has) {
		63  		t.Errorf("expected %q in %q", has, line)
		64  	}
		65  }
		66
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