Variant Domain 구현

src/main/kotlin/at/voyagers/common/cart/business/AddCartVariant.kt

@@ -27,7 +27,7 @@ class AddCartVariant(
         val product = Product(Random.nextLong(), "Product", "Description",
             Random.nextDouble(), ProductStatus.ACTIVE, Random.nextLong())
 
-        val orderVariant = OrderVariant(variant.id, product.price, request.quantity)
+        val orderVariant = OrderVariant(variant.id!!, product.price, request.quantity)
         cart.addVariant(orderVariant)
 
         return true

src/main/kotlin/at/voyagers/common/variant/domain/Variant.kt

@@ -1,17 +1,16 @@
 package at.voyagers.common.variant.domain
 
-import java.util.*
 import kotlin.random.Random
 
 data class Variant(
-    val id: Long,
     val productId: Long,
     val quantity: Int,
+
+    var id: Long? = null,
 ) {
     companion object {
         fun create(productId: Long, quantity: Int): Variant {
             return Variant(
-                id = Random.nextLong(),
                 productId = productId,
                 quantity = quantity,
             )

src/test/kotlin/at/voyagers/common/variant/domain/VariantTest.kt

@@ -0,0 +1,16 @@
+package at.voyagers.common.variant.domain
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+
+class VariantTest {
+
+    @Test
+    fun create() {
+        Variant.create(productId = 0L, quantity = 10).apply {
+            assertThat(id).isNull()
+            assertThat(productId).isNotNull
+            assertThat(quantity).isGreaterThan(0)
+        }
+    }
+}