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388 lines
7.2 KiB
388 lines
7.2 KiB
package clist
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import (
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"fmt"
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mrand "math/rand"
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"runtime"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestPanicOnMaxLength(t *testing.T) {
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maxLength := 1000
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l := newWithMax(maxLength)
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for i := 0; i < maxLength; i++ {
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l.PushBack(1)
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}
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assert.Panics(t, func() {
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l.PushBack(1)
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})
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}
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func TestSmall(t *testing.T) {
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l := New()
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el1 := l.PushBack(1)
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el2 := l.PushBack(2)
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el3 := l.PushBack(3)
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if l.Len() != 3 {
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t.Error("Expected len 3, got ", l.Len())
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}
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// fmt.Printf("%p %v\n", el1, el1)
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// fmt.Printf("%p %v\n", el2, el2)
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// fmt.Printf("%p %v\n", el3, el3)
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r1 := l.Remove(el1)
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// fmt.Printf("%p %v\n", el1, el1)
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// fmt.Printf("%p %v\n", el2, el2)
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// fmt.Printf("%p %v\n", el3, el3)
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r2 := l.Remove(el2)
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// fmt.Printf("%p %v\n", el1, el1)
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// fmt.Printf("%p %v\n", el2, el2)
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// fmt.Printf("%p %v\n", el3, el3)
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r3 := l.Remove(el3)
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if r1 != 1 {
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t.Error("Expected 1, got ", r1)
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}
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if r2 != 2 {
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t.Error("Expected 2, got ", r2)
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}
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if r3 != 3 {
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t.Error("Expected 3, got ", r3)
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}
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if l.Len() != 0 {
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t.Error("Expected len 0, got ", l.Len())
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}
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}
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func TestGCFifo(t *testing.T) {
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const numElements = 10000
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l := New()
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gcCount := 0
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// SetFinalizer doesn't work well with circular structures,
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// so we construct a trivial non-circular structure to
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// track.
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type value struct {
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Int int
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}
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gcCh := make(chan struct{})
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for i := 0; i < numElements; i++ {
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v := new(value)
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v.Int = i
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l.PushBack(v)
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runtime.SetFinalizer(v, func(v *value) {
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gcCh <- struct{}{}
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})
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}
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for el := l.Front(); el != nil; {
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l.Remove(el)
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// oldEl := el
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el = el.Next()
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// oldEl.DetachPrev()
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// oldEl.DetachNext()
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}
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tickerQuitCh := make(chan struct{})
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tickerDoneCh := make(chan struct{})
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go func() {
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defer close(tickerDoneCh)
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ticker := time.NewTicker(250 * time.Millisecond)
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for {
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select {
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case <-ticker.C:
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runtime.GC()
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case <-tickerQuitCh:
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return
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}
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}
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}()
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for i := 0; i < numElements; i++ {
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<-gcCh
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gcCount++
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}
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close(tickerQuitCh)
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<-tickerDoneCh
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if gcCount != numElements {
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t.Errorf("expected gcCount to be %v, got %v", numElements,
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gcCount)
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}
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}
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func TestGCRandom(t *testing.T) {
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const numElements = 10000
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l := New()
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gcCount := 0
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// SetFinalizer doesn't work well with circular structures,
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// so we construct a trivial non-circular structure to
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// track.
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type value struct {
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Int int
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}
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gcCh := make(chan struct{})
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for i := 0; i < numElements; i++ {
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v := new(value)
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v.Int = i
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l.PushBack(v)
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runtime.SetFinalizer(v, func(v *value) {
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gcCh <- struct{}{}
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})
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}
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els := make([]*CElement, 0, numElements)
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for el := l.Front(); el != nil; el = el.Next() {
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els = append(els, el)
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}
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for _, i := range mrand.Perm(numElements) {
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el := els[i]
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l.Remove(el)
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_ = el.Next()
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}
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tickerQuitCh := make(chan struct{})
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tickerDoneCh := make(chan struct{})
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go func() {
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defer close(tickerDoneCh)
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ticker := time.NewTicker(250 * time.Millisecond)
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for {
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select {
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case <-ticker.C:
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runtime.GC()
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case <-tickerQuitCh:
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return
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}
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}
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}()
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for i := 0; i < numElements; i++ {
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<-gcCh
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gcCount++
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}
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close(tickerQuitCh)
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<-tickerDoneCh
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if gcCount != numElements {
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t.Errorf("expected gcCount to be %v, got %v", numElements,
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gcCount)
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}
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}
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func TestScanRightDeleteRandom(t *testing.T) {
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const numElements = 1000
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const numTimes = 100
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const numScanners = 10
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l := New()
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stop := make(chan struct{})
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els := make([]*CElement, numElements)
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for i := 0; i < numElements; i++ {
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el := l.PushBack(i)
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els[i] = el
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}
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// Launch scanner routines that will rapidly iterate over elements.
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for i := 0; i < numScanners; i++ {
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go func(scannerID int) {
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var el *CElement
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restartCounter := 0
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counter := 0
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FOR_LOOP:
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for {
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select {
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case <-stop:
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fmt.Println("stopped")
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break FOR_LOOP
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default:
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}
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if el == nil {
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el = l.FrontWait()
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restartCounter++
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}
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el = el.Next()
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counter++
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}
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fmt.Printf("Scanner %v restartCounter: %v counter: %v\n", scannerID, restartCounter, counter)
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}(i)
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}
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// Remove an element, push back an element.
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for i := 0; i < numTimes; i++ {
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// Pick an element to remove
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rmElIdx := mrand.Intn(len(els))
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rmEl := els[rmElIdx]
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// Remove it
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l.Remove(rmEl)
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// fmt.Print(".")
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// Insert a new element
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newEl := l.PushBack(-1*i - 1)
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els[rmElIdx] = newEl
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if i%100000 == 0 {
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fmt.Printf("Pushed %vK elements so far...\n", i/1000)
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}
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}
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// Stop scanners
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close(stop)
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// time.Sleep(time.Second * 1)
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// And remove all the elements.
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for el := l.Front(); el != nil; el = el.Next() {
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l.Remove(el)
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}
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if l.Len() != 0 {
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t.Fatal("Failed to remove all elements from CList")
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}
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}
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func TestWaitChan(t *testing.T) {
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l := New()
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ch := l.WaitChan()
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// 1) add one element to an empty list
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go l.PushBack(1)
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<-ch
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// 2) and remove it
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el := l.Front()
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v := l.Remove(el)
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if v != 1 {
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t.Fatal("where is 1 coming from?")
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}
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// 3) test iterating forward and waiting for Next (NextWaitChan and Next)
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el = l.PushBack(0)
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done := make(chan struct{})
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pushed := 0
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go func() {
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defer close(done)
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for i := 1; i < 100; i++ {
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l.PushBack(i)
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pushed++
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time.Sleep(time.Duration(mrand.Intn(20)) * time.Millisecond)
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}
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// apply a deterministic pause so the counter has time to catch up
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time.Sleep(20 * time.Millisecond)
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}()
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next := el
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seen := 0
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FOR_LOOP:
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for {
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select {
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case <-next.NextWaitChan():
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next = next.Next()
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seen++
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if next == nil {
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t.Fatal("Next should not be nil when waiting on NextWaitChan")
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}
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case <-done:
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break FOR_LOOP
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case <-time.After(2 * time.Second):
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t.Fatal("max execution time")
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}
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}
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if pushed != seen {
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t.Fatalf("number of pushed items (%d) not equal to number of seen items (%d)", pushed, seen)
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}
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// 4) test iterating backwards (PrevWaitChan and Prev)
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prev := next
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seen = 0
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FOR_LOOP2:
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for {
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select {
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case <-prev.PrevWaitChan():
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prev = prev.Prev()
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seen++
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if prev == nil {
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t.Fatal("expected PrevWaitChan to block forever on nil when reached first elem")
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}
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if pushed == seen {
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break FOR_LOOP2
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}
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case <-time.After(250 * time.Millisecond):
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break FOR_LOOP2
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}
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}
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if pushed != seen {
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t.Fatalf("number of pushed items (%d) not equal to number of seen items (%d)", pushed, seen)
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}
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}
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func TestRemoved(t *testing.T) {
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l := New()
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el1 := l.PushBack(1)
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el2 := l.PushBack(2)
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l.Remove(el1)
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require.True(t, el1.Removed())
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require.False(t, el2.Removed())
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}
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func TestNextWaitChan(t *testing.T) {
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l := New()
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el1 := l.PushBack(1)
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t.Run("tail element should not have a closed nextWaitChan", func(t *testing.T) {
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select {
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case <-el1.NextWaitChan():
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t.Fatal("nextWaitChan should not have been closed")
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default:
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}
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})
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el2 := l.PushBack(2)
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t.Run("adding element should close tail nextWaitChan", func(t *testing.T) {
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select {
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case <-el1.NextWaitChan():
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require.NotNil(t, el1.Next())
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default:
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t.Fatal("nextWaitChan should have been closed")
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}
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select {
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case <-el2.NextWaitChan():
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t.Fatal("nextWaitChan should not have been closed")
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default:
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}
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})
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t.Run("removing element should close its nextWaitChan", func(t *testing.T) {
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l.Remove(el2)
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select {
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case <-el2.NextWaitChan():
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require.Nil(t, el2.Next())
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default:
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t.Fatal("nextWaitChan should have been closed")
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}
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})
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}
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