add test

Author: smilad

oryxBuildBinary

@@ -61,3 +61,15 @@ var _ = Describe("UniversalClient", func() {
 		Expect(a).ToNot(Panic())
 	})
 })
+
+It("should connect to failover servers on slaves", func() {
+	Skip("Flaky Test")
+	client = redis.NewUniversalClient(&redis.UniversalOptions{
+		MasterName: sentinelName,
+		Addrs:      sentinelAddrs,
+		ReadOnly: true,
+	})
+	Expect(client.Ping(ctx).Err()).NotTo(HaveOccurred())
+	a := func() { client.Do(ctx, "ROLE").Result() }
+    Expect(a).ToNot(Panic())
+})