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476 lines
11 KiB
Go
476 lines
11 KiB
Go
// Copyright (c) 2015, Emir Pasic. 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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package arraystack
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import (
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"encoding/json"
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"fmt"
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"strings"
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"testing"
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)
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func TestStackPush(t *testing.T) {
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stack := New()
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if actualValue := stack.Empty(); actualValue != true {
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t.Errorf("Got %v expected %v", actualValue, true)
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}
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stack.Push(1)
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stack.Push(2)
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stack.Push(3)
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if actualValue := stack.Values(); actualValue[0].(int) != 3 || actualValue[1].(int) != 2 || actualValue[2].(int) != 1 {
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t.Errorf("Got %v expected %v", actualValue, "[3,2,1]")
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}
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if actualValue := stack.Empty(); actualValue != false {
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t.Errorf("Got %v expected %v", actualValue, false)
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}
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if actualValue := stack.Size(); actualValue != 3 {
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t.Errorf("Got %v expected %v", actualValue, 3)
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}
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if actualValue, ok := stack.Peek(); actualValue != 3 || !ok {
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t.Errorf("Got %v expected %v", actualValue, 3)
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}
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}
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func TestStackPeek(t *testing.T) {
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stack := New()
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if actualValue, ok := stack.Peek(); actualValue != nil || ok {
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t.Errorf("Got %v expected %v", actualValue, nil)
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}
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stack.Push(1)
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stack.Push(2)
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stack.Push(3)
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if actualValue, ok := stack.Peek(); actualValue != 3 || !ok {
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t.Errorf("Got %v expected %v", actualValue, 3)
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}
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}
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func TestStackPop(t *testing.T) {
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stack := New()
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stack.Push(1)
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stack.Push(2)
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stack.Push(3)
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stack.Pop()
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if actualValue, ok := stack.Peek(); actualValue != 2 || !ok {
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t.Errorf("Got %v expected %v", actualValue, 2)
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}
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if actualValue, ok := stack.Pop(); actualValue != 2 || !ok {
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t.Errorf("Got %v expected %v", actualValue, 2)
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}
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if actualValue, ok := stack.Pop(); actualValue != 1 || !ok {
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t.Errorf("Got %v expected %v", actualValue, 1)
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}
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if actualValue, ok := stack.Pop(); actualValue != nil || ok {
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t.Errorf("Got %v expected %v", actualValue, nil)
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}
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if actualValue := stack.Empty(); actualValue != true {
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t.Errorf("Got %v expected %v", actualValue, true)
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}
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if actualValue := stack.Values(); len(actualValue) != 0 {
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t.Errorf("Got %v expected %v", actualValue, "[]")
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}
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}
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func TestStackIteratorOnEmpty(t *testing.T) {
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stack := New()
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it := stack.Iterator()
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for it.Next() {
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t.Errorf("Shouldn't iterate on empty stack")
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}
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}
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func TestStackIteratorNext(t *testing.T) {
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stack := New()
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stack.Push("a")
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stack.Push("b")
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stack.Push("c")
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it := stack.Iterator()
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count := 0
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for it.Next() {
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count++
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index := it.Index()
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value := it.Value()
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switch index {
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case 0:
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if actualValue, expectedValue := value, "c"; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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case 1:
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if actualValue, expectedValue := value, "b"; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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case 2:
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if actualValue, expectedValue := value, "a"; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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default:
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t.Errorf("Too many")
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}
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if actualValue, expectedValue := index, count-1; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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}
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if actualValue, expectedValue := count, 3; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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}
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func TestStackIteratorPrev(t *testing.T) {
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stack := New()
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stack.Push("a")
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stack.Push("b")
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stack.Push("c")
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it := stack.Iterator()
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for it.Next() {
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}
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count := 0
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for it.Prev() {
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count++
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index := it.Index()
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value := it.Value()
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switch index {
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case 0:
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if actualValue, expectedValue := value, "c"; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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case 1:
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if actualValue, expectedValue := value, "b"; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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case 2:
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if actualValue, expectedValue := value, "a"; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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default:
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t.Errorf("Too many")
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}
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if actualValue, expectedValue := index, 3-count; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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}
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if actualValue, expectedValue := count, 3; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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}
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func TestStackIteratorBegin(t *testing.T) {
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stack := New()
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it := stack.Iterator()
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it.Begin()
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stack.Push("a")
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stack.Push("b")
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stack.Push("c")
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for it.Next() {
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}
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it.Begin()
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it.Next()
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if index, value := it.Index(), it.Value(); index != 0 || value != "c" {
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t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "c")
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}
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}
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func TestStackIteratorEnd(t *testing.T) {
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stack := New()
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it := stack.Iterator()
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if index := it.Index(); index != -1 {
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t.Errorf("Got %v expected %v", index, -1)
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}
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it.End()
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if index := it.Index(); index != 0 {
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t.Errorf("Got %v expected %v", index, 0)
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}
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stack.Push("a")
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stack.Push("b")
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stack.Push("c")
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it.End()
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if index := it.Index(); index != stack.Size() {
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t.Errorf("Got %v expected %v", index, stack.Size())
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}
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it.Prev()
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if index, value := it.Index(), it.Value(); index != stack.Size()-1 || value != "a" {
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t.Errorf("Got %v,%v expected %v,%v", index, value, stack.Size()-1, "a")
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}
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}
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func TestStackIteratorFirst(t *testing.T) {
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stack := New()
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it := stack.Iterator()
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if actualValue, expectedValue := it.First(), false; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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stack.Push("a")
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stack.Push("b")
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stack.Push("c")
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if actualValue, expectedValue := it.First(), true; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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if index, value := it.Index(), it.Value(); index != 0 || value != "c" {
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t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "c")
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}
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}
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func TestStackIteratorLast(t *testing.T) {
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stack := New()
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it := stack.Iterator()
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if actualValue, expectedValue := it.Last(), false; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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stack.Push("a")
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stack.Push("b")
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stack.Push("c")
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if actualValue, expectedValue := it.Last(), true; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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if index, value := it.Index(), it.Value(); index != 2 || value != "a" {
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t.Errorf("Got %v,%v expected %v,%v", index, value, 2, "a")
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}
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}
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func TestStackIteratorNextTo(t *testing.T) {
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// Sample seek function, i.e. string starting with "b"
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seek := func(index int, value interface{}) bool {
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return strings.HasSuffix(value.(string), "b")
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}
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// NextTo (empty)
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{
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stack := New()
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it := stack.Iterator()
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for it.NextTo(seek) {
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t.Errorf("Shouldn't iterate on empty stack")
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}
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}
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// NextTo (not found)
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{
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stack := New()
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stack.Push("xx")
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stack.Push("yy")
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it := stack.Iterator()
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for it.NextTo(seek) {
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t.Errorf("Shouldn't iterate on empty stack")
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}
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}
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// NextTo (found)
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{
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stack := New()
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stack.Push("aa")
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stack.Push("bb")
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stack.Push("cc")
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it := stack.Iterator()
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it.Begin()
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if !it.NextTo(seek) {
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t.Errorf("Shouldn't iterate on empty stack")
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}
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if index, value := it.Index(), it.Value(); index != 1 || value.(string) != "bb" {
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t.Errorf("Got %v,%v expected %v,%v", index, value, 1, "bb")
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}
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if !it.Next() {
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t.Errorf("Should go to first element")
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}
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if index, value := it.Index(), it.Value(); index != 2 || value.(string) != "aa" {
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t.Errorf("Got %v,%v expected %v,%v", index, value, 2, "aa")
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}
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if it.Next() {
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t.Errorf("Should not go past last element")
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}
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}
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}
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func TestStackIteratorPrevTo(t *testing.T) {
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// Sample seek function, i.e. string starting with "b"
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seek := func(index int, value interface{}) bool {
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return strings.HasSuffix(value.(string), "b")
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}
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// PrevTo (empty)
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{
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stack := New()
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it := stack.Iterator()
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it.End()
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for it.PrevTo(seek) {
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t.Errorf("Shouldn't iterate on empty stack")
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}
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}
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// PrevTo (not found)
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{
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stack := New()
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stack.Push("xx")
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stack.Push("yy")
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it := stack.Iterator()
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it.End()
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for it.PrevTo(seek) {
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t.Errorf("Shouldn't iterate on empty stack")
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}
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}
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// PrevTo (found)
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{
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stack := New()
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stack.Push("aa")
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stack.Push("bb")
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stack.Push("cc")
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it := stack.Iterator()
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it.End()
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if !it.PrevTo(seek) {
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t.Errorf("Shouldn't iterate on empty stack")
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}
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if index, value := it.Index(), it.Value(); index != 1 || value.(string) != "bb" {
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t.Errorf("Got %v,%v expected %v,%v", index, value, 1, "bb")
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}
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if !it.Prev() {
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t.Errorf("Should go to first element")
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}
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if index, value := it.Index(), it.Value(); index != 0 || value.(string) != "cc" {
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t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "cc")
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}
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if it.Prev() {
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t.Errorf("Should not go before first element")
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}
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}
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}
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func TestStackSerialization(t *testing.T) {
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stack := New()
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stack.Push("a")
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stack.Push("b")
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stack.Push("c")
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var err error
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assert := func() {
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if actualValue, expectedValue := fmt.Sprintf("%s%s%s", stack.Values()...), "cba"; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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if actualValue, expectedValue := stack.Size(), 3; actualValue != expectedValue {
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t.Errorf("Got %v expected %v", actualValue, expectedValue)
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}
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if err != nil {
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t.Errorf("Got error %v", err)
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}
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}
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assert()
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bytes, err := stack.ToJSON()
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assert()
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err = stack.FromJSON(bytes)
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assert()
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bytes, err = json.Marshal([]interface{}{"a", "b", "c", stack})
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if err != nil {
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t.Errorf("Got error %v", err)
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}
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}
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func benchmarkPush(b *testing.B, stack *Stack, size int) {
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for i := 0; i < b.N; i++ {
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for n := 0; n < size; n++ {
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stack.Push(n)
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}
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}
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}
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func benchmarkPop(b *testing.B, stack *Stack, size int) {
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for i := 0; i < b.N; i++ {
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for n := 0; n < size; n++ {
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stack.Pop()
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}
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}
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}
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func BenchmarkArrayStackPop100(b *testing.B) {
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b.StopTimer()
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size := 100
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stack := New()
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for n := 0; n < size; n++ {
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stack.Push(n)
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}
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b.StartTimer()
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benchmarkPop(b, stack, size)
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}
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func BenchmarkArrayStackPop1000(b *testing.B) {
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b.StopTimer()
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size := 1000
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stack := New()
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for n := 0; n < size; n++ {
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stack.Push(n)
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}
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b.StartTimer()
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benchmarkPop(b, stack, size)
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}
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func BenchmarkArrayStackPop10000(b *testing.B) {
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b.StopTimer()
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size := 10000
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stack := New()
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for n := 0; n < size; n++ {
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stack.Push(n)
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}
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b.StartTimer()
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benchmarkPop(b, stack, size)
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}
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func BenchmarkArrayStackPop100000(b *testing.B) {
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b.StopTimer()
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size := 100000
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stack := New()
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for n := 0; n < size; n++ {
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stack.Push(n)
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}
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b.StartTimer()
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benchmarkPop(b, stack, size)
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}
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func BenchmarkArrayStackPush100(b *testing.B) {
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b.StopTimer()
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size := 100
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stack := New()
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b.StartTimer()
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benchmarkPush(b, stack, size)
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}
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func BenchmarkArrayStackPush1000(b *testing.B) {
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b.StopTimer()
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size := 1000
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stack := New()
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for n := 0; n < size; n++ {
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stack.Push(n)
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}
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b.StartTimer()
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benchmarkPush(b, stack, size)
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}
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func BenchmarkArrayStackPush10000(b *testing.B) {
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b.StopTimer()
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size := 10000
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stack := New()
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for n := 0; n < size; n++ {
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stack.Push(n)
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}
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b.StartTimer()
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benchmarkPush(b, stack, size)
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}
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func BenchmarkArrayStackPush100000(b *testing.B) {
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b.StopTimer()
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size := 100000
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stack := New()
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for n := 0; n < size; n++ {
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stack.Push(n)
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}
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b.StartTimer()
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benchmarkPush(b, stack, size)
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}
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