optimize unit test & add document

tools/goctl/model/sql/example/config/config.go

@@ -0,0 +1,22 @@
+package config
+
+import (
+	"github.com/tal-tech/go-zero/core/logx"
+	"github.com/tal-tech/go-zero/core/stores/cache"
+	"github.com/tal-tech/go-zero/core/stores/redis"
+)
+
+type (
+	Config struct {
+		logx.LogConf
+		Mysql struct {
+			DataSource string
+			Table      struct {
+				User   string
+				Course string
+			}
+		}
+		CacheRedis cache.CacheConf
+		Redis      redis.RedisConf
+	}
+)