1 files changed, 65 insertions, 0 deletions
diff --git a/src/runtime/debug/stack_test.go b/src/runtime/debug/stack_test.go
new file mode 100644
index 0000000..9376e82
--- /dev/null
+++ b/src/runtime/debug/stack_test.go
@@ -0,0 +1,65 @@
+// 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_test
+
+import (
+	. "runtime/debug"
+	"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_test.(*T).ptrmethod")
+	frame("src/runtime/debug/stack_test.go", "runtime/debug_test.T.method")
+	frame("src/runtime/debug/stack_test.go", "runtime/debug_test.TestStack")
+	frame("src/testing/testing.go", "")
+}
+
+func check(t *testing.T, line, has string) {
+	if !strings.Contains(line, has) {
+		t.Errorf("expected %q in %q", has, line)
+	}
+}