Vendor golang.org/x/sync

vendor/golang.org/x/sync/syncmap/map_test.go

@@ -0,0 +1,172 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package syncmap_test
+
+import (
+	"math/rand"
+	"reflect"
+	"runtime"
+	"sync"
+	"testing"
+	"testing/quick"
+
+	"golang.org/x/sync/syncmap"
+)
+
+type mapOp string
+
+const (
+	opLoad        = mapOp("Load")
+	opStore       = mapOp("Store")
+	opLoadOrStore = mapOp("LoadOrStore")
+	opDelete      = mapOp("Delete")
+)
+
+var mapOps = [...]mapOp{opLoad, opStore, opLoadOrStore, opDelete}
+
+// mapCall is a quick.Generator for calls on mapInterface.
+type mapCall struct {
+	op   mapOp
+	k, v interface{}
+}
+
+func (c mapCall) apply(m mapInterface) (interface{}, bool) {
+	switch c.op {
+	case opLoad:
+		return m.Load(c.k)
+	case opStore:
+		m.Store(c.k, c.v)
+		return nil, false
+	case opLoadOrStore:
+		return m.LoadOrStore(c.k, c.v)
+	case opDelete:
+		m.Delete(c.k)
+		return nil, false
+	default:
+		panic("invalid mapOp")
+	}
+}
+
+type mapResult struct {
+	value interface{}
+	ok    bool
+}
+
+func randValue(r *rand.Rand) interface{} {
+	b := make([]byte, r.Intn(4))
+	for i := range b {
+		b[i] = 'a' + byte(rand.Intn(26))
+	}
+	return string(b)
+}
+
+func (mapCall) Generate(r *rand.Rand, size int) reflect.Value {
+	c := mapCall{op: mapOps[rand.Intn(len(mapOps))], k: randValue(r)}
+	switch c.op {
+	case opStore, opLoadOrStore:
+		c.v = randValue(r)
+	}
+	return reflect.ValueOf(c)
+}
+
+func applyCalls(m mapInterface, calls []mapCall) (results []mapResult, final map[interface{}]interface{}) {
+	for _, c := range calls {
+		v, ok := c.apply(m)
+		results = append(results, mapResult{v, ok})
+	}
+
+	final = make(map[interface{}]interface{})
+	m.Range(func(k, v interface{}) bool {
+		final[k] = v
+		return true
+	})
+
+	return results, final
+}
+
+func applyMap(calls []mapCall) ([]mapResult, map[interface{}]interface{}) {
+	return applyCalls(new(syncmap.Map), calls)
+}
+
+func applyRWMutexMap(calls []mapCall) ([]mapResult, map[interface{}]interface{}) {
+	return applyCalls(new(RWMutexMap), calls)
+}
+
+func applyDeepCopyMap(calls []mapCall) ([]mapResult, map[interface{}]interface{}) {
+	return applyCalls(new(DeepCopyMap), calls)
+}
+
+func TestMapMatchesRWMutex(t *testing.T) {
+	if err := quick.CheckEqual(applyMap, applyRWMutexMap, nil); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestMapMatchesDeepCopy(t *testing.T) {
+	if err := quick.CheckEqual(applyMap, applyDeepCopyMap, nil); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestConcurrentRange(t *testing.T) {
+	const mapSize = 1 << 10
+
+	m := new(syncmap.Map)
+	for n := int64(1); n <= mapSize; n++ {
+		m.Store(n, int64(n))
+	}
+
+	done := make(chan struct{})
+	var wg sync.WaitGroup
+	defer func() {
+		close(done)
+		wg.Wait()
+	}()
+	for g := int64(runtime.GOMAXPROCS(0)); g > 0; g-- {
+		r := rand.New(rand.NewSource(g))
+		wg.Add(1)
+		go func(g int64) {
+			defer wg.Done()
+			for i := int64(0); ; i++ {
+				select {
+				case <-done:
+					return
+				default:
+				}
+				for n := int64(1); n < mapSize; n++ {
+					if r.Int63n(mapSize) == 0 {
+						m.Store(n, n*i*g)
+					} else {
+						m.Load(n)
+					}
+				}
+			}
+		}(g)
+	}
+
+	iters := 1 << 10
+	if testing.Short() {
+		iters = 16
+	}
+	for n := iters; n > 0; n-- {
+		seen := make(map[int64]bool, mapSize)
+
+		m.Range(func(ki, vi interface{}) bool {
+			k, v := ki.(int64), vi.(int64)
+			if v%k != 0 {
+				t.Fatalf("while Storing multiples of %v, Range saw value %v", k, v)
+			}
+			if seen[k] {
+				t.Fatalf("Range visited key %v twice", k)
+			}
+			seen[k] = true
+			return true
+		})
+
+		if len(seen) != mapSize {
+			t.Fatalf("Range visited %v elements of %v-element Map", len(seen), mapSize)
+		}
+	}
+}