feat:add scalable_rand test (polarismesh#207)

* feat:add scalable_rand test

* Add empty line

Author: liu-song

Diff for: common/srand/scalable_rand_test.go

@@ -0,0 +1,59 @@
+/**
+ * Tencent is pleased to support the open source community by making polaris-go available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed
+ * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package srand
+
+import (
+	"math/rand"
+	"testing"
+)
+
+func BenchmarkSingleCore(b *testing.B) {
+
+	b.Run("scalable_rand-Intn()", func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			_ = Intn(1000)
+		}
+	})
+
+	b.Run("math/rand-Intn()", func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			_ = rand.Intn(1000)
+		}
+	})
+
+}
+
+func BenchmarkMultipleCore(b *testing.B) {
+
+	b.Run("scalable_rand-Intn()", func(b *testing.B) {
+		b.RunParallel(func(pb *testing.PB) {
+			for pb.Next() {
+				_ = Intn(1000)
+			}
+		})
+	})
+
+	b.Run("math/rand-Intn()", func(b *testing.B) {
+		b.RunParallel(func(pb *testing.PB) {
+			for pb.Next() {
+				_ = rand.Intn(1000)
+			}
+		})
+	})
+
+}