common/prque: pull in tests and benchmarks from upstream

common/prque/prque_test.go

+// CookieJar - A contestant's algorithm toolbox
+// Copyright (c) 2013 Peter Szilagyi. All rights reserved.
+//
+// CookieJar is dual licensed: use of this source code is governed by a BSD
+// license that can be found in the LICENSE file. 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(nil)
+	for rep := 0; rep < 2; rep++ {
+		// Fill a priority queue with the above data
+		for i := 0; i < size; i++ {
+			queue.Push(data[i], int64(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[int64]int)
+		for i := 0; i < size; i++ {
+			dict[int64(prio[i])] = data[i]
+		}
+		// Pop out the elements in priority order and verify them
+		prevPrio := int64(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(nil)
+	for rep := 0; rep < 2; rep++ {
+		// Fill a priority queue with the above data
+		for i := 0; i < size; i++ {
+			queue.Push(data[i], int64(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[int64]int)
+		for i := 0; i < size; i++ {
+			dict[int64(prio[i])] = data[i]
+		}
+		// Pop out half the elements in priority order and verify them
+		prevPrio := int64(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([]int64, b.N)
+	for i := 0; i < len(data); i++ {
+		data[i] = rand.Int()
+		prio[i] = rand.Int63()
+	}
+	// Execute the benchmark
+	b.ResetTimer()
+	queue := New(nil)
+	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([]int64, b.N)
+	for i := 0; i < len(data); i++ {
+		data[i] = rand.Int()
+		prio[i] = rand.Int63()
+	}
+	queue := New(nil)
+	for i := 0; i < len(data); i++ {
+		queue.Push(data[i], prio[i])
+	}
+	// Execute the benchmark
+	b.ResetTimer()
+	for !queue.Empty() {
+		queue.Pop()
+	}
+}

common/prque/sstack_test.go

+// CookieJar - A contestant's algorithm toolbox
+// Copyright (c) 2013 Peter Szilagyi. All rights reserved.
+//
+// CookieJar is dual licensed: use of this source code is governed by a BSD
+// license that can be found in the LICENSE file. 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"
+	"sort"
+	"testing"
+)
+
+func TestSstack(t *testing.T) {
+	// Create some initial data
+	size := 16 * blockSize
+	data := make([]*item, size)
+	for i := 0; i < size; i++ {
+		data[i] = &item{rand.Int(), rand.Int63()}
+	}
+	stack := newSstack(nil)
+	for rep := 0; rep < 2; rep++ {
+		// Push all the data into the stack, pop out every second
+		secs := []*item{}
+		for i := 0; i < size; i++ {
+			stack.Push(data[i])
+			if i%2 == 0 {
+				secs = append(secs, stack.Pop().(*item))
+			}
+		}
+		rest := []*item{}
+		for stack.Len() > 0 {
+			rest = append(rest, stack.Pop().(*item))
+		}
+		// Make sure the contents of the resulting slices are ok
+		for i := 0; i < size; i++ {
+			if i%2 == 0 && data[i] != secs[i/2] {
+				t.Errorf("push/pop mismatch: have %v, want %v.", secs[i/2], data[i])
+			}
+			if i%2 == 1 && data[i] != rest[len(rest)-i/2-1] {
+				t.Errorf("push/pop mismatch: have %v, want %v.", rest[len(rest)-i/2-1], data[i])
+			}
+		}
+	}
+}
+
+func TestSstackSort(t *testing.T) {
+	// Create some initial data
+	size := 16 * blockSize
+	data := make([]*item, size)
+	for i := 0; i < size; i++ {
+		data[i] = &item{rand.Int(), int64(i)}
+	}
+	// Push all the data into the stack
+	stack := newSstack(nil)
+	for _, val := range data {
+		stack.Push(val)
+	}
+	// Sort and pop the stack contents (should reverse the order)
+	sort.Sort(stack)
+	for _, val := range data {
+		out := stack.Pop()
+		if out != val {
+			t.Errorf("push/pop mismatch after sort: have %v, want %v.", out, val)
+		}
+	}
+}
+
+func TestSstackReset(t *testing.T) {
+	// Create some initial data
+	size := 16 * blockSize
+	data := make([]*item, size)
+	for i := 0; i < size; i++ {
+		data[i] = &item{rand.Int(), rand.Int63()}
+	}
+	stack := newSstack(nil)
+	for rep := 0; rep < 2; rep++ {
+		// Push all the data into the stack, pop out every second
+		secs := []*item{}
+		for i := 0; i < size; i++ {
+			stack.Push(data[i])
+			if i%2 == 0 {
+				secs = append(secs, stack.Pop().(*item))
+			}
+		}
+		// Reset and verify both pulled and stack contents
+		stack.Reset()
+		if stack.Len() != 0 {
+			t.Errorf("stack not empty after reset: %v", stack)
+		}
+		for i := 0; i < size; i++ {
+			if i%2 == 0 && data[i] != secs[i/2] {
+				t.Errorf("push/pop mismatch: have %v, want %v.", secs[i/2], data[i])
+			}
+		}
+	}
+}