fix go1.10.3 orm test failed

.travis.yml

@@ -2,7 +2,7 @@ language: go
 
 go:
   - "1.9.2"
-  - "1.10.2"
+  - "1.10.3"
 services:
   - redis-server
   - mysql

orm/models_test.go

@@ -433,11 +433,8 @@ var (
 	dDbBaser dbBaser
 )
 
-func init() {
-	Debug, _ = StrTo(DBARGS.Debug).Bool()
-
-	if DBARGS.Driver == "" || DBARGS.Source == "" {
-		fmt.Println(`need driver and source!
+var (
+	helpinfo = `need driver and source!
 
 	Default DB Drivers.
 	
@@ -479,7 +476,14 @@ export ORM_DRIVER=tidb
 	export ORM_SOURCE='memory://test/test'
 	go test -v github.com/astaxie/beego/orm
 	
-`)
+	`
+)
+
+func init() {
+	Debug, _ = StrTo(DBARGS.Debug).Bool()
+
+	if DBARGS.Driver == "" || DBARGS.Source == "" {
+		fmt.Println(helpinfo)
 		os.Exit(2)
 	}