add miss Pipeline and TxPipeline

Signed-off-by: monkey <golang@88.com>

ring_test.go

@@ -188,13 +188,15 @@ var _ = Describe("Redis Ring", func() {
 		})
 	})
 
-	It("supports Process hook", func() {
+	Describe("Process hook", func() {
+		BeforeEach(func() {
 			//the health check leads to data race for variable "stack []string".
 			//here, the health check time is set to 72 hours to avoid health check
 			opt := redisRingOptions()
 			opt.HeartbeatFrequency = 72 * time.Hour
 			ring = redis.NewRing(opt)
-
+		})
+		It("supports Process hook", func() {
 			err := ring.Ping(ctx).Err()
 			Expect(err).NotTo(HaveOccurred())
 
@@ -343,6 +345,7 @@ var _ = Describe("Redis Ring", func() {
 			}))
 		})
 	})
+})
 
 var _ = Describe("empty Redis Ring", func() {
 	var ring *redis.Ring