mirror of https://github.com/emirpasic/gods
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
574 lines
14 KiB
Go
574 lines
14 KiB
Go
// Copyright (c) 2015, Emir Pasic. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package priorityqueue
|
|
|
|
import (
|
|
"cmp"
|
|
"encoding/json"
|
|
"fmt"
|
|
"math/rand"
|
|
"strings"
|
|
"testing"
|
|
)
|
|
|
|
type Element struct {
|
|
priority int
|
|
name string
|
|
}
|
|
|
|
func (element Element) String() string {
|
|
return fmt.Sprintf("{%v %v}", element.priority, element.name)
|
|
}
|
|
|
|
// Comparator function (sort by priority value in descending order)
|
|
func byPriority(a, b Element) int {
|
|
return -cmp.Compare(a.priority, b.priority) // Note "-" for descending order
|
|
}
|
|
|
|
func TestBinaryQueueEnqueue(t *testing.T) {
|
|
queue := NewWith[Element](byPriority)
|
|
|
|
if actualValue := queue.Empty(); actualValue != true {
|
|
t.Errorf("Got %v expected %v", actualValue, true)
|
|
}
|
|
|
|
a := Element{name: "a", priority: 1}
|
|
c := Element{name: "c", priority: 3}
|
|
b := Element{name: "b", priority: 2}
|
|
|
|
queue.Enqueue(a)
|
|
queue.Enqueue(c)
|
|
queue.Enqueue(b)
|
|
|
|
it := queue.Iterator()
|
|
count := 0
|
|
for it.Next() {
|
|
count++
|
|
index := it.Index()
|
|
value := it.Value()
|
|
switch index {
|
|
case 0:
|
|
if actualValue, expectedValue := value.name, "c"; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
case 1:
|
|
if actualValue, expectedValue := value.name, "b"; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
case 2:
|
|
if actualValue, expectedValue := value.name, "a"; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
default:
|
|
t.Errorf("Too many")
|
|
}
|
|
if actualValue, expectedValue := index, count-1; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
}
|
|
|
|
if actualValue := queue.Values(); actualValue[0].name != "c" || actualValue[1].name != "b" || actualValue[2].name != "a" {
|
|
t.Errorf("Got %v expected %v", actualValue, `[{3 c} {2 b} {1 a}]`)
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueEnqueueBulk(t *testing.T) {
|
|
queue := New[int]()
|
|
|
|
queue.Enqueue(15)
|
|
queue.Enqueue(20)
|
|
queue.Enqueue(3)
|
|
queue.Enqueue(1)
|
|
queue.Enqueue(2)
|
|
|
|
if actualValue, ok := queue.Dequeue(); actualValue != 1 || !ok {
|
|
t.Errorf("Got %v expected %v", actualValue, 1)
|
|
}
|
|
if actualValue, ok := queue.Dequeue(); actualValue != 2 || !ok {
|
|
t.Errorf("Got %v expected %v", actualValue, 2)
|
|
}
|
|
if actualValue, ok := queue.Dequeue(); actualValue != 3 || !ok {
|
|
t.Errorf("Got %v expected %v", actualValue, 3)
|
|
}
|
|
if actualValue, ok := queue.Dequeue(); actualValue != 15 || !ok {
|
|
t.Errorf("Got %v expected %v", actualValue, 15)
|
|
}
|
|
if actualValue, ok := queue.Dequeue(); actualValue != 20 || !ok {
|
|
t.Errorf("Got %v expected %v", actualValue, 20)
|
|
}
|
|
|
|
queue.Clear()
|
|
if actualValue := queue.Empty(); !actualValue {
|
|
t.Errorf("Got %v expected %v", actualValue, true)
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueDequeue(t *testing.T) {
|
|
queue := New[int]()
|
|
|
|
if actualValue := queue.Empty(); actualValue != true {
|
|
t.Errorf("Got %v expected %v", actualValue, true)
|
|
}
|
|
|
|
queue.Enqueue(3)
|
|
queue.Enqueue(2)
|
|
queue.Enqueue(1)
|
|
queue.Dequeue() // removes 1
|
|
|
|
if actualValue, ok := queue.Dequeue(); actualValue != 2 || !ok {
|
|
t.Errorf("Got %v expected %v", actualValue, 2)
|
|
}
|
|
if actualValue, ok := queue.Dequeue(); actualValue != 3 || !ok {
|
|
t.Errorf("Got %v expected %v", actualValue, 3)
|
|
}
|
|
if actualValue, ok := queue.Dequeue(); actualValue != 0 || ok {
|
|
t.Errorf("Got %v expected %v", actualValue, nil)
|
|
}
|
|
if actualValue := queue.Empty(); actualValue != true {
|
|
t.Errorf("Got %v expected %v", actualValue, true)
|
|
}
|
|
if actualValue := queue.Values(); len(actualValue) != 0 {
|
|
t.Errorf("Got %v expected %v", actualValue, "[]")
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueRandom(t *testing.T) {
|
|
queue := New[int]()
|
|
|
|
rand.Seed(3)
|
|
for i := 0; i < 10000; i++ {
|
|
r := int(rand.Int31n(30))
|
|
queue.Enqueue(r)
|
|
}
|
|
|
|
prev, _ := queue.Dequeue()
|
|
for !queue.Empty() {
|
|
curr, _ := queue.Dequeue()
|
|
if prev > curr {
|
|
t.Errorf("Queue property invalidated. prev: %v current: %v", prev, curr)
|
|
}
|
|
prev = curr
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueIteratorOnEmpty(t *testing.T) {
|
|
queue := New[int]()
|
|
it := queue.Iterator()
|
|
for it.Next() {
|
|
t.Errorf("Shouldn't iterate on empty queue")
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueIteratorNext(t *testing.T) {
|
|
queue := New[int]()
|
|
queue.Enqueue(3)
|
|
queue.Enqueue(2)
|
|
queue.Enqueue(1)
|
|
|
|
it := queue.Iterator()
|
|
count := 0
|
|
for it.Next() {
|
|
count++
|
|
index := it.Index()
|
|
value := it.Value()
|
|
switch index {
|
|
case 0:
|
|
if actualValue, expectedValue := value, 1; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
case 1:
|
|
if actualValue, expectedValue := value, 2; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
case 2:
|
|
if actualValue, expectedValue := value, 3; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
default:
|
|
t.Errorf("Too many")
|
|
}
|
|
if actualValue, expectedValue := index, count-1; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
}
|
|
if actualValue, expectedValue := count, 3; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueIteratorPrev(t *testing.T) {
|
|
queue := New[int]()
|
|
queue.Enqueue(3)
|
|
queue.Enqueue(2)
|
|
queue.Enqueue(1)
|
|
|
|
it := queue.Iterator()
|
|
for it.Next() {
|
|
}
|
|
count := 0
|
|
for it.Prev() {
|
|
count++
|
|
index := it.Index()
|
|
value := it.Value()
|
|
switch index {
|
|
case 0:
|
|
if actualValue, expectedValue := value, 1; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
case 1:
|
|
if actualValue, expectedValue := value, 2; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
case 2:
|
|
if actualValue, expectedValue := value, 3; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
default:
|
|
t.Errorf("Too many")
|
|
}
|
|
if actualValue, expectedValue := index, 3-count; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
}
|
|
if actualValue, expectedValue := count, 3; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueIteratorBegin(t *testing.T) {
|
|
queue := New[int]()
|
|
it := queue.Iterator()
|
|
it.Begin()
|
|
queue.Enqueue(2)
|
|
queue.Enqueue(3)
|
|
queue.Enqueue(1)
|
|
for it.Next() {
|
|
}
|
|
it.Begin()
|
|
it.Next()
|
|
if index, value := it.Index(), it.Value(); index != 0 || value != 1 {
|
|
t.Errorf("Got %v,%v expected %v,%v", index, value, 0, 1)
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueIteratorEnd(t *testing.T) {
|
|
queue := New[int]()
|
|
it := queue.Iterator()
|
|
|
|
if index := it.Index(); index != -1 {
|
|
t.Errorf("Got %v expected %v", index, -1)
|
|
}
|
|
|
|
it.End()
|
|
if index := it.Index(); index != 0 {
|
|
t.Errorf("Got %v expected %v", index, 0)
|
|
}
|
|
|
|
queue.Enqueue(3)
|
|
queue.Enqueue(2)
|
|
queue.Enqueue(1)
|
|
it.End()
|
|
if index := it.Index(); index != queue.Size() {
|
|
t.Errorf("Got %v expected %v", index, queue.Size())
|
|
}
|
|
|
|
it.Prev()
|
|
if index, value := it.Index(), it.Value(); index != queue.Size()-1 || value != 3 {
|
|
t.Errorf("Got %v,%v expected %v,%v", index, value, queue.Size()-1, 3)
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueIteratorFirst(t *testing.T) {
|
|
queue := New[int]()
|
|
it := queue.Iterator()
|
|
if actualValue, expectedValue := it.First(), false; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
queue.Enqueue(3) // [3]
|
|
queue.Enqueue(2) // [2,3]
|
|
queue.Enqueue(1) // [1,3,2](2 swapped with 1, hence last)
|
|
if actualValue, expectedValue := it.First(), true; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
if index, value := it.Index(), it.Value(); index != 0 || value != 1 {
|
|
t.Errorf("Got %v,%v expected %v,%v", index, value, 0, 1)
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueIteratorLast(t *testing.T) {
|
|
tree := New[int]()
|
|
it := tree.Iterator()
|
|
if actualValue, expectedValue := it.Last(), false; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
tree.Enqueue(2)
|
|
tree.Enqueue(3)
|
|
tree.Enqueue(1)
|
|
if actualValue, expectedValue := it.Last(), true; actualValue != expectedValue {
|
|
t.Errorf("Got %v expected %v", actualValue, expectedValue)
|
|
}
|
|
if index, value := it.Index(), it.Value(); index != 2 || value != 3 {
|
|
t.Errorf("Got %v,%v expected %v,%v", index, value, 2, 3)
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueIteratorNextTo(t *testing.T) {
|
|
// Sample seek function, i.e. string starting with "b"
|
|
seek := func(index int, value string) bool {
|
|
return strings.HasSuffix(value, "b")
|
|
}
|
|
|
|
// NextTo (empty)
|
|
{
|
|
tree := New[string]()
|
|
it := tree.Iterator()
|
|
for it.NextTo(seek) {
|
|
t.Errorf("Shouldn't iterate on empty list")
|
|
}
|
|
}
|
|
|
|
// NextTo (not found)
|
|
{
|
|
tree := New[string]()
|
|
tree.Enqueue("xx")
|
|
tree.Enqueue("yy")
|
|
it := tree.Iterator()
|
|
for it.NextTo(seek) {
|
|
t.Errorf("Shouldn't iterate on empty list")
|
|
}
|
|
}
|
|
|
|
// NextTo (found)
|
|
{
|
|
tree := New[string]()
|
|
tree.Enqueue("aa")
|
|
tree.Enqueue("bb")
|
|
tree.Enqueue("cc")
|
|
it := tree.Iterator()
|
|
it.Begin()
|
|
if !it.NextTo(seek) {
|
|
t.Errorf("Shouldn't iterate on empty list")
|
|
}
|
|
if index, value := it.Index(), it.Value(); index != 1 || value != "bb" {
|
|
t.Errorf("Got %v,%v expected %v,%v", index, value, 1, "bb")
|
|
}
|
|
if !it.Next() {
|
|
t.Errorf("Should go to first element")
|
|
}
|
|
if index, value := it.Index(), it.Value(); index != 2 || value != "cc" {
|
|
t.Errorf("Got %v,%v expected %v,%v", index, value, 2, "cc")
|
|
}
|
|
if it.Next() {
|
|
t.Errorf("Should not go past last element")
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueIteratorPrevTo(t *testing.T) {
|
|
// Sample seek function, i.e. string starting with "b"
|
|
seek := func(index int, value string) bool {
|
|
return strings.HasSuffix(value, "b")
|
|
}
|
|
|
|
// PrevTo (empty)
|
|
{
|
|
tree := New[string]()
|
|
it := tree.Iterator()
|
|
it.End()
|
|
for it.PrevTo(seek) {
|
|
t.Errorf("Shouldn't iterate on empty list")
|
|
}
|
|
}
|
|
|
|
// PrevTo (not found)
|
|
{
|
|
tree := New[string]()
|
|
tree.Enqueue("xx")
|
|
tree.Enqueue("yy")
|
|
it := tree.Iterator()
|
|
it.End()
|
|
for it.PrevTo(seek) {
|
|
t.Errorf("Shouldn't iterate on empty list")
|
|
}
|
|
}
|
|
|
|
// PrevTo (found)
|
|
{
|
|
tree := New[string]()
|
|
tree.Enqueue("aa")
|
|
tree.Enqueue("bb")
|
|
tree.Enqueue("cc")
|
|
it := tree.Iterator()
|
|
it.End()
|
|
if !it.PrevTo(seek) {
|
|
t.Errorf("Shouldn't iterate on empty list")
|
|
}
|
|
if index, value := it.Index(), it.Value(); index != 1 || value != "bb" {
|
|
t.Errorf("Got %v,%v expected %v,%v", index, value, 1, "bb")
|
|
}
|
|
if !it.Prev() {
|
|
t.Errorf("Should go to first element")
|
|
}
|
|
if index, value := it.Index(), it.Value(); index != 0 || value != "aa" {
|
|
t.Errorf("Got %v,%v expected %v,%v", index, value, 0, "aa")
|
|
}
|
|
if it.Prev() {
|
|
t.Errorf("Should not go before first element")
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestBinaryQueueSerialization(t *testing.T) {
|
|
queue := New[string]()
|
|
|
|
queue.Enqueue("c")
|
|
queue.Enqueue("b")
|
|
queue.Enqueue("a")
|
|
|
|
var err error
|
|
assert := func() {
|
|
if actualValue := queue.Values(); actualValue[0] != "a" || actualValue[1] != "b" || actualValue[2] != "c" {
|
|
t.Errorf("Got %v expected %v", actualValue, "[1,3,2]")
|
|
}
|
|
if actualValue := queue.Size(); actualValue != 3 {
|
|
t.Errorf("Got %v expected %v", actualValue, 3)
|
|
}
|
|
if actualValue, ok := queue.Peek(); actualValue != "a" || !ok {
|
|
t.Errorf("Got %v expected %v", actualValue, "a")
|
|
}
|
|
if err != nil {
|
|
t.Errorf("Got error %v", err)
|
|
}
|
|
}
|
|
|
|
assert()
|
|
|
|
bytes, err := queue.ToJSON()
|
|
assert()
|
|
|
|
err = queue.FromJSON(bytes)
|
|
assert()
|
|
|
|
bytes, err = json.Marshal([]interface{}{"a", "b", "c", queue})
|
|
if err != nil {
|
|
t.Errorf("Got error %v", err)
|
|
}
|
|
|
|
err = json.Unmarshal([]byte(`["a","b","c"]`), &queue)
|
|
if err != nil {
|
|
t.Errorf("Got error %v", err)
|
|
}
|
|
assert()
|
|
}
|
|
|
|
func TestBTreeString(t *testing.T) {
|
|
c := New[int]()
|
|
c.Enqueue(1)
|
|
if !strings.HasPrefix(c.String(), "PriorityQueue") {
|
|
t.Errorf("String should start with container name")
|
|
}
|
|
}
|
|
|
|
func benchmarkEnqueue(b *testing.B, queue *Queue[Element], size int) {
|
|
for i := 0; i < b.N; i++ {
|
|
for n := 0; n < size; n++ {
|
|
queue.Enqueue(Element{})
|
|
}
|
|
}
|
|
}
|
|
|
|
func benchmarkDequeue(b *testing.B, queue *Queue[Element], size int) {
|
|
for i := 0; i < b.N; i++ {
|
|
for n := 0; n < size; n++ {
|
|
queue.Dequeue()
|
|
}
|
|
}
|
|
}
|
|
|
|
func BenchmarkBinaryQueueDequeue100(b *testing.B) {
|
|
b.StopTimer()
|
|
size := 100
|
|
queue := NewWith[Element](byPriority)
|
|
for n := 0; n < size; n++ {
|
|
queue.Enqueue(Element{})
|
|
}
|
|
b.StartTimer()
|
|
benchmarkDequeue(b, queue, size)
|
|
}
|
|
|
|
func BenchmarkBinaryQueueDequeue1000(b *testing.B) {
|
|
b.StopTimer()
|
|
size := 1000
|
|
queue := NewWith[Element](byPriority)
|
|
for n := 0; n < size; n++ {
|
|
queue.Enqueue(Element{})
|
|
}
|
|
b.StartTimer()
|
|
benchmarkDequeue(b, queue, size)
|
|
}
|
|
|
|
func BenchmarkBinaryQueueDequeue10000(b *testing.B) {
|
|
b.StopTimer()
|
|
size := 10000
|
|
queue := NewWith[Element](byPriority)
|
|
for n := 0; n < size; n++ {
|
|
queue.Enqueue(Element{})
|
|
}
|
|
b.StartTimer()
|
|
benchmarkDequeue(b, queue, size)
|
|
}
|
|
|
|
func BenchmarkBinaryQueueDequeue100000(b *testing.B) {
|
|
b.StopTimer()
|
|
size := 100000
|
|
queue := NewWith[Element](byPriority)
|
|
for n := 0; n < size; n++ {
|
|
queue.Enqueue(Element{})
|
|
}
|
|
b.StartTimer()
|
|
benchmarkDequeue(b, queue, size)
|
|
}
|
|
|
|
func BenchmarkBinaryQueueEnqueue100(b *testing.B) {
|
|
b.StopTimer()
|
|
size := 100
|
|
queue := NewWith(byPriority)
|
|
b.StartTimer()
|
|
benchmarkEnqueue(b, queue, size)
|
|
}
|
|
|
|
func BenchmarkBinaryQueueEnqueue1000(b *testing.B) {
|
|
b.StopTimer()
|
|
size := 1000
|
|
queue := NewWith[Element](byPriority)
|
|
for n := 0; n < size; n++ {
|
|
queue.Enqueue(Element{})
|
|
}
|
|
b.StartTimer()
|
|
benchmarkEnqueue(b, queue, size)
|
|
}
|
|
|
|
func BenchmarkBinaryQueueEnqueue10000(b *testing.B) {
|
|
b.StopTimer()
|
|
size := 10000
|
|
queue := NewWith[Element](byPriority)
|
|
for n := 0; n < size; n++ {
|
|
queue.Enqueue(Element{})
|
|
}
|
|
b.StartTimer()
|
|
benchmarkEnqueue(b, queue, size)
|
|
}
|
|
|
|
func BenchmarkBinaryQueueEnqueue100000(b *testing.B) {
|
|
b.StopTimer()
|
|
size := 100000
|
|
queue := NewWith[Element](byPriority)
|
|
for n := 0; n < size; n++ {
|
|
queue.Enqueue(Element{})
|
|
}
|
|
b.StartTimer()
|
|
benchmarkEnqueue(b, queue, size)
|
|
}
|