268 lines
5.6 KiB
Go
268 lines
5.6 KiB
Go
// 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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package sort
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import (
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"fmt"
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"rand"
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"strconv"
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"testing"
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)
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var ints = [...]int{74, 59, 238, -784, 9845, 959, 905, 0, 0, 42, 7586, -5467984, 7586}
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var floats = [...]float{74.3, 59.0, 238.2, -784.0, 2.3, 9845.768, -959.7485, 905, 7.8, 7.8}
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var strings = [...]string{"", "Hello", "foo", "bar", "foo", "f00", "%*&^*&^&", "***"}
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func TestSortIntArray(t *testing.T) {
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data := ints
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a := IntArray(data[0:])
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Sort(a)
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if !IsSorted(a) {
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t.Errorf("sorted %v", ints)
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t.Errorf(" got %v", data)
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}
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}
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func TestSortFloatArray(t *testing.T) {
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data := floats
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a := FloatArray(data[0:])
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Sort(a)
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if !IsSorted(a) {
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t.Errorf("sorted %v", floats)
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t.Errorf(" got %v", data)
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}
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}
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func TestSortStringArray(t *testing.T) {
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data := strings
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a := StringArray(data[0:])
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Sort(a)
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if !IsSorted(a) {
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t.Errorf("sorted %v", strings)
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t.Errorf(" got %v", data)
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}
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}
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func TestSortInts(t *testing.T) {
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data := ints
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SortInts(data[0:])
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if !IntsAreSorted(data[0:]) {
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t.Errorf("sorted %v", ints)
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t.Errorf(" got %v", data)
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}
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}
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func TestSortFloats(t *testing.T) {
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data := floats
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SortFloats(data[0:])
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if !FloatsAreSorted(data[0:]) {
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t.Errorf("sorted %v", floats)
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t.Errorf(" got %v", data)
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}
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}
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func TestSortStrings(t *testing.T) {
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data := strings
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SortStrings(data[0:])
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if !StringsAreSorted(data[0:]) {
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t.Errorf("sorted %v", strings)
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t.Errorf(" got %v", data)
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}
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}
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func TestSortLarge_Random(t *testing.T) {
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data := make([]int, 1000000)
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for i := 0; i < len(data); i++ {
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data[i] = rand.Intn(100)
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}
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if IntsAreSorted(data) {
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t.Fatalf("terrible rand.rand")
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}
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SortInts(data)
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if !IntsAreSorted(data) {
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t.Errorf("sort didn't sort - 1M ints")
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}
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}
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func BenchmarkSortString1K(b *testing.B) {
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b.StopTimer()
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for i := 0; i < b.N; i++ {
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data := make([]string, 1<<10)
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for i := 0; i < len(data); i++ {
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data[i] = strconv.Itoa(i ^ 0x2cc)
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}
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b.StartTimer()
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SortStrings(data)
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b.StopTimer()
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}
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}
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func BenchmarkSortInt1K(b *testing.B) {
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b.StopTimer()
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for i := 0; i < b.N; i++ {
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data := make([]int, 1<<10)
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for i := 0; i < len(data); i++ {
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data[i] = i ^ 0x2cc
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}
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b.StartTimer()
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SortInts(data)
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b.StopTimer()
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}
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}
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func BenchmarkSortInt64K(b *testing.B) {
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b.StopTimer()
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for i := 0; i < b.N; i++ {
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data := make([]int, 1<<16)
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for i := 0; i < len(data); i++ {
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data[i] = i ^ 0xcccc
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}
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b.StartTimer()
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SortInts(data)
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b.StopTimer()
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}
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}
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const (
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_Sawtooth = iota
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_Rand
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_Stagger
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_Plateau
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_Shuffle
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_NDist
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)
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const (
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_Copy = iota
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_Reverse
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_ReverseFirstHalf
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_ReverseSecondHalf
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_Sorted
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_Dither
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_NMode
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)
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type testingData struct {
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desc string
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t *testing.T
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data []int
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maxswap int // number of swaps allowed
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nswap int
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}
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func (d *testingData) Len() int { return len(d.data) }
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func (d *testingData) Less(i, j int) bool { return d.data[i] < d.data[j] }
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func (d *testingData) Swap(i, j int) {
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if d.nswap >= d.maxswap {
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d.t.Errorf("%s: used %d swaps sorting array of %d", d.desc, d.nswap, len(d.data))
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d.t.FailNow()
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}
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d.nswap++
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d.data[i], d.data[j] = d.data[j], d.data[i]
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}
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func lg(n int) int {
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i := 0
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for 1<<uint(i) < n {
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i++
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}
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return i
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}
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func TestBentleyMcIlroy(t *testing.T) {
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sizes := []int{100, 1023, 1024, 1025}
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dists := []string{"sawtooth", "rand", "stagger", "plateau", "shuffle"}
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modes := []string{"copy", "reverse", "reverse1", "reverse2", "sort", "dither"}
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var tmp1, tmp2 [1025]int
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for ni := 0; ni < len(sizes); ni++ {
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n := sizes[ni]
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for m := 1; m < 2*n; m *= 2 {
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for dist := 0; dist < _NDist; dist++ {
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j := 0
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k := 1
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data := tmp1[0:n]
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for i := 0; i < n; i++ {
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switch dist {
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case _Sawtooth:
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data[i] = i % m
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case _Rand:
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data[i] = rand.Intn(m)
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case _Stagger:
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data[i] = (i*m + i) % n
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case _Plateau:
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data[i] = min(i, m)
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case _Shuffle:
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if rand.Intn(m) != 0 {
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j += 2
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data[i] = j
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} else {
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k += 2
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data[i] = k
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}
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}
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}
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mdata := tmp2[0:n]
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for mode := 0; mode < _NMode; mode++ {
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switch mode {
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case _Copy:
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for i := 0; i < n; i++ {
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mdata[i] = data[i]
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}
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case _Reverse:
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for i := 0; i < n; i++ {
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mdata[i] = data[n-i-1]
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}
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case _ReverseFirstHalf:
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for i := 0; i < n/2; i++ {
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mdata[i] = data[n/2-i-1]
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}
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for i := n / 2; i < n; i++ {
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mdata[i] = data[i]
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}
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case _ReverseSecondHalf:
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for i := 0; i < n/2; i++ {
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mdata[i] = data[i]
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}
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for i := n / 2; i < n; i++ {
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mdata[i] = data[n-(i-n/2)-1]
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}
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case _Sorted:
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for i := 0; i < n; i++ {
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mdata[i] = data[i]
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}
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// SortInts is known to be correct
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// because mode Sort runs after mode _Copy.
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SortInts(mdata)
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case _Dither:
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for i := 0; i < n; i++ {
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mdata[i] = data[i] + i%5
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}
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}
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desc := fmt.Sprintf("n=%d m=%d dist=%s mode=%s", n, m, dists[dist], modes[mode])
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d := &testingData{desc, t, mdata[0:n], n * lg(n) * 12 / 10, 0}
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Sort(d)
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// If we were testing C qsort, we'd have to make a copy
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// of the array and sort it ourselves and then compare
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// x against it, to ensure that qsort was only permuting
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// the data, not (for example) overwriting it with zeros.
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//
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// In go, we don't have to be so paranoid: since the only
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// mutating method Sort can call is TestingData.swap,
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// it suffices here just to check that the final array is sorted.
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if !IntsAreSorted(mdata) {
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t.Errorf("%s: ints not sorted", desc)
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t.Errorf("\t%v", mdata)
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t.FailNow()
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}
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}
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}
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}
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}
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}
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