Fix incorrect key in concurrent benchmarks

Fixes #111

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2012-2017 Patrick Mylund Nielsen and the go-cache contributors
+Copyright (c) 2012-2019 Patrick Mylund Nielsen and the go-cache contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

cache_test.go

@@ -1555,7 +1555,7 @@ func benchmarkCacheGetManyConcurrent(b *testing.B, exp time.Duration) {
 	tc := New(exp, 0)
 	keys := make([]string, n)
 	for i := 0; i < n; i++ {
-		k := "foo" + strconv.Itoa(n)
+		k := "foo" + strconv.Itoa(i)
 		keys[i] = k
 		tc.Set(k, "bar", DefaultExpiration)
 	}
@@ -1563,12 +1563,12 @@ func benchmarkCacheGetManyConcurrent(b *testing.B, exp time.Duration) {
 	wg := new(sync.WaitGroup)
 	wg.Add(n)
 	for _, v := range keys {
-		go func() {
+		go func(k string) {
 			for j := 0; j < each; j++ {
-				tc.Get(v)
+				tc.Get(k)
 			}
 			wg.Done()
-		}()
+		}(v)
 	}
 	b.StartTimer()
 	wg.Wait()

sharded_test.go

@@ -65,7 +65,7 @@ func benchmarkShardedCacheGetManyConcurrent(b *testing.B, exp time.Duration) {
 	tsc := unexportedNewSharded(exp, 0, 20)
 	keys := make([]string, n)
 	for i := 0; i < n; i++ {
-		k := "foo" + strconv.Itoa(n)
+		k := "foo" + strconv.Itoa(i)
 		keys[i] = k
 		tsc.Set(k, "bar", DefaultExpiration)
 	}
@@ -73,12 +73,12 @@ func benchmarkShardedCacheGetManyConcurrent(b *testing.B, exp time.Duration) {
 	wg := new(sync.WaitGroup)
 	wg.Add(n)
 	for _, v := range keys {
-		go func() {
+		go func(k string) {
 			for j := 0; j < each; j++ {
-				tsc.Get(v)
+				tsc.Get(k)
 			}
 			wg.Done()
-		}()
+		}(v)
 	}
 	b.StartTimer()
 	wg.Wait()