Fix: remove unused code according to golangci-lint

adapter/cache/cache_test.go

@@ -23,13 +23,7 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-const (
+const initError = "init err"
-	initError     = "init err"
-	setError      = "set Error"
-	checkError    = "check err"
-	getError      = "get err"
-	getMultiError = "GetMulti Error"
-)
 
 func TestCacheIncr(t *testing.T) {
 	bm, err := NewCache("memory", `{"interval":20}`)

adapter/cache/memcache/memcache_test.go

@@ -26,16 +26,7 @@ import (
 	"github.com/beego/beego/v2/adapter/cache"
 )
 
-const (
-	initError     = "init err"
-	setError      = "set Error"
-	checkError    = "check err"
-	getError      = "get err"
-	getMultiError = "GetMulti Error"
-)
-
 func TestMemcacheCache(t *testing.T) {
-
 	addr := os.Getenv("MEMCACHE_ADDR")
 	if addr == "" {
 		addr = "127.0.0.1:11211"

adapter/cache/redis/redis_test.go

@@ -27,11 +27,8 @@ import (
 )
 
 const (
-	initError     = "init err"
+	initError = "init err"
-	setError      = "set Error"
+	setError  = "set Error"
-	checkError    = "check err"
-	getError      = "get err"
-	getMultiError = "GetMulti Error"
 )
 
 func TestRedisCache(t *testing.T) {
@@ -121,5 +118,4 @@ func TestCacheScan(t *testing.T) {
 	if err = bm.ClearAll(); err != nil {
 		t.Error("clear all err")
 	}
-
 }

adapter/cache/ssdb/ssdb_test.go

@@ -12,14 +12,6 @@ import (
 	"github.com/beego/beego/v2/adapter/cache"
 )
 
-const (
-	initError     = "init err"
-	setError      = "set Error"
-	checkError    = "check err"
-	getError      = "get err"
-	getMultiError = "GetMulti Error"
-)
-
 func TestSsdbcacheCache(t *testing.T) {
 	ssdbAddr := os.Getenv("SSDB_ADDR")
 	if ssdbAddr == "" {