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// CookieJar - A contestant's algorithm toolbox
// Copyright (c) 2013 Peter Szilagyi. All rights reserved.
//
// CookieJar is dual licensed: you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// The toolbox is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// Alternatively, the CookieJar toolbox may be used in accordance with the terms
// and conditions contained in a signed written agreement between you and the
// author(s).
package prque
import (
"math/rand"
"testing"
)
func TestPrque(t *testing.T) {
// Generate a batch of random data and a specific priority order
size := 16 * blockSize
prio := rand.Perm(size)
data := make([]int, size)
for i := 0; i < size; i++ {
data[i] = rand.Int()
}
queue := New()
for rep := 0; rep < 2; rep++ {
// Fill a priority queue with the above data
for i := 0; i < size; i++ {
queue.Push(data[i], float32(prio[i]))
if queue.Size() != i+1 {
t.Errorf("queue size mismatch: have %v, want %v.", queue.Size(), i+1)
}
}
// Create a map the values to the priorities for easier verification
dict := make(map[float32]int)
for i := 0; i < size; i++ {
dict[float32(prio[i])] = data[i]
}
// Pop out the elements in priority order and verify them
prevPrio := float32(size + 1)
for !queue.Empty() {
val, prio := queue.Pop()
if prio > prevPrio {
t.Errorf("invalid priority order: %v after %v.", prio, prevPrio)
}
prevPrio = prio
if val != dict[prio] {
t.Errorf("push/pop mismatch: have %v, want %v.", val, dict[prio])
}
delete(dict, prio)
}
}
}
func TestReset(t *testing.T) {
// Generate a batch of random data and a specific priority order
size := 16 * blockSize
prio := rand.Perm(size)
data := make([]int, size)
for i := 0; i < size; i++ {
data[i] = rand.Int()
}
queue := New()
for rep := 0; rep < 2; rep++ {
// Fill a priority queue with the above data
for i := 0; i < size; i++ {
queue.Push(data[i], float32(prio[i]))
if queue.Size() != i+1 {
t.Errorf("queue size mismatch: have %v, want %v.", queue.Size(), i+1)
}
}
// Create a map the values to the priorities for easier verification
dict := make(map[float32]int)
for i := 0; i < size; i++ {
dict[float32(prio[i])] = data[i]
}
// Pop out half the elements in priority order and verify them
prevPrio := float32(size + 1)
for i := 0; i < size/2; i++ {
val, prio := queue.Pop()
if prio > prevPrio {
t.Errorf("invalid priority order: %v after %v.", prio, prevPrio)
}
prevPrio = prio
if val != dict[prio] {
t.Errorf("push/pop mismatch: have %v, want %v.", val, dict[prio])
}
delete(dict, prio)
}
// Reset and ensure it's empty
queue.Reset()
if !queue.Empty() {
t.Errorf("priority queue not empty after reset: %v", queue)
}
}
}
func BenchmarkPush(b *testing.B) {
// Create some initial data
data := make([]int, b.N)
prio := make([]float32, b.N)
for i := 0; i < len(data); i++ {
data[i] = rand.Int()
prio[i] = rand.Float32()
}
// Execute the benchmark
b.ResetTimer()
queue := New()
for i := 0; i < len(data); i++ {
queue.Push(data[i], prio[i])
}
}
func BenchmarkPop(b *testing.B) {
// Create some initial data
data := make([]int, b.N)
prio := make([]float32, b.N)
for i := 0; i < len(data); i++ {
data[i] = rand.Int()
prio[i] = rand.Float32()
}
queue := New()
for i := 0; i < len(data); i++ {
queue.Push(data[i], prio[i])
}
// Execute the benchmark
b.ResetTimer()
for !queue.Empty() {
queue.Pop()
}
}
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