diff --git a/test/relation_test.go b/test/relation_test.go
new file mode 100644
index 0000000..56e5404
--- /dev/null
+++ b/test/relation_test.go
@@ -0,0 +1 @@
+package test
diff --git a/test/typedef_test.go b/test/typedef_test.go
new file mode 100644
index 0000000..6a77401
--- /dev/null
+++ b/test/typedef_test.go
@@ -0,0 +1,85 @@
+/*
+사용 가능한 annotations
+
+Primary Key
+`gorm:"primary_key"`
+
+Auto Increase
+`gorm:"AUTO_INCREMENT"`
+
+Index
+`gorm:"index"`
+
+Unique Index
+`gorm:"unique_index"`
+
+Set SQL type
+`gorm:"type:varchar(100)’
+
+Not null and Unique
+`gorm:"not null;unique"`
+
+Set Column name
+`gorm:"column:loafler_id"`
+
+Many to Many
+`gorm:"many2many:user_languages;"`  //  'user_languages' is join table
+
+Ignore
+`gorm:"-"`
+*/
+
+package test
+
+import (
+	"database/sql"
+	"github.com/jinzhu/gorm"
+	"time"
+)
+
+type User struct {
+	gorm.Model
+
+	Birthday time.Time
+	Age      int
+	Name     string `gorm:"size:255"` // Default size for string is 255, reset it with this tag
+	Num      int    `gorm:"AUTO_INCREMENT"`
+
+	CreditCard CreditCard // One-To-One relationship (has one - use CreditCard's UserID as foreign key)
+	Emails     []Email    // One-To-Many relationship (has many - use Email's UserID as foreign key)
+
+	BillingAddress   Address // One-To-One relationship (belongs to - use BillingAddressID as foreign key)
+	BillingAddressID sql.NullInt64
+
+	ShippingAddress   Address // One-To-One relationship (belongs to - use ShippingAddressID as foreign key)
+	ShippingAddressID int
+
+	IgnoreMe  int        `gorm:"-"`                         // Ignore this field
+	Languages []Language `gorm:"many2many:user_languages;"` // Many-To-Many relationship, 'user_languages' is join table
+}
+
+type Email struct {
+	ID         int
+	UserID     int    `gorm:"index"`                          // Foreign key (belongs to), tag `index` will create index for this column
+	Email      string `gorm:"type:varchar(100);unique_index"` // `type` set sql type, `unique_index` will create unique index for this column
+	Subscribed bool
+}
+
+type Address struct {
+	ID       int
+	Address1 string         `gorm:"not null;unique"` // Set field as not nullable and unique
+	Address2 string         `gorm:"type:varchar(100);unique"`
+	Post     sql.NullString `gorm:"not null"`
+}
+
+type Language struct {
+	ID   int
+	Name string `gorm:"index:idx_name_code"` // Create index with name, and will create combined index if find other fields defined same name
+	Code string `gorm:"index:idx_name_code"` // `unique_index` also works
+}
+
+type CreditCard struct {
+	gorm.Model
+	UserID uint
+	Number string
+}