// Issue 18836.
func TestEmptyCallStack(t *testing.T) {
	name := fmt.Sprintf("test18836_%d", emptyCallStackTestRun)
	emptyCallStackTestRun++

	t.Parallel()
	var buf strings.Builder
	p := NewProfile(name)

	p.Add("foo", 47674)
	p.WriteTo(&buf, 1)
	p.Remove("foo")
	got := buf.String()
	prefix := name + " profile: total 1\n"
	if !strings.HasPrefix(got, prefix) {