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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// For debugging - keep around.
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for p := r; i < n; p = p.next {
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fmt.Printf("%4d: %p = {<- %p | %p ->}\n", i, p, p.prev, p.next)
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func verify(t *testing.T, r *Ring, N int, sum int) {
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t.Errorf("r.Len() == %d; expected %d", n, N)
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r.Do(func(p interface{}) {
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t.Errorf("number of forward iterations == %d; expected %d", n, N)
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if sum >= 0 && s != sum {
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t.Errorf("forward ring sum = %d; expected %d", s, sum)
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var p *Ring // previous element
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for q := r; p == nil || q != r; q = q.next {
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if p != nil && p != q.prev {
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t.Errorf("prev = %p, expected q.prev = %p\n", p, q.prev)
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t.Errorf("prev = %p, expected r.prev = %p\n", p, r.prev)
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if r.Next() != r.next {
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t.Errorf("r.Next() != r.next")
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if r.Prev() != r.prev {
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t.Errorf("r.Prev() != r.prev")
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t.Errorf("r.Move(0) != r")
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t.Errorf("r.Move(%d) != r", N)
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t.Errorf("r.Move(%d) != r", -N)
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for i := 0; i < 10; i++ {
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if r.Move(ni) != r.Move(mi) {
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t.Errorf("r.Move(%d) != r.Move(%d)", ni, mi)
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if r.Move(-ni) != r.Move(-mi) {
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t.Errorf("r.Move(%d) != r.Move(%d)", -ni, -mi)
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func TestCornerCases(t *testing.T) {
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func makeN(n int) *Ring {
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for i := 1; i <= n; i++ {
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func sumN(n int) int { return (n*n + n) / 2 }
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func TestNew(t *testing.T) {
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for i := 0; i < 10; i++ {
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for i := 0; i < 10; i++ {
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verify(t, r, i, sumN(i))
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func TestLink1(t *testing.T) {
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r2a := r1a.Link(&r1b)
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t.Errorf("a) 2-element link failed")
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r2b := r2a.Link(r2a.Next())
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if r2b != r2a.Next() {
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t.Errorf("b) 2-element link failed")
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func TestLink2(t *testing.T) {
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r1a := &Ring{Value: 42}
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r1b := &Ring{Value: 77}
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verify(t, r1a, 1, 42)
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verify(t, r1a, 2, 42+77)
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verify(t, r10, 10, sumN(10))
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verify(t, r10, 12, sumN(10)+42+77)
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func TestLink3(t *testing.T) {
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for i := 1; i < 100; i++ {
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verify(t, r.Link(New(i)), n, -1)
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func TestUnlink(t *testing.T) {
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verify(t, r10, 10, sum10)
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verify(t, s10, 10, sum10)
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verify(t, r10, 9, sum10-2)
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verify(t, r9, 9, sum10-2)
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verify(t, r10, 9, sum10-2)
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func TestLinkUnlink(t *testing.T) {
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for i := 1; i < 4; i++ {
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for j := 0; j < i; j++ {
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verify(t, ri, i-j, -1)