feat: 테스트를 위해 임의의 결제 정보를 제공하기 위한 랜덤값 생성 유틸 클래스 추가

tosspay-mock/src/main/kotlin/com/sangdol/tosspaymock/business/domain/RandomValueGenerator.kt

@@ -0,0 +1,45 @@
+package com.sangdol.tosspaymock.business.domain
+
+object RandomCardValueGenerator {
+    fun cardNumber(): String {
+        return "${(10000000..99999999).random()}****${(100..999).random()}*"
+    }
+
+    fun approvalNumber(): String {
+        return "${(0..99999999).random()}".padStart(8, '0')
+    }
+
+    fun installmentPlanMonths(amount: Int): Int {
+        return if (amount < 50_000 || Math.random() < 0.95) {
+            0
+        } else {
+            (1..6).random()
+        }
+    }
+}
+
+object RandomEasypayValueGenerator {
+    fun point(amount: Int): Int =
+        if (amount < 100 || Math.random() < 0.8) {
+            0
+        } else {
+            // 100~amount 까지 100원 단위로 생성
+            ((100..amount).random() / 100) * 100
+        }
+}
+
+object RandomPaymentValueGenerator {
+    fun mId(): String {
+        val words = ('a'..'z')
+        val randomValue = (1..9).map { words.random() }.joinToString("")
+
+        return "tgen_${randomValue}"
+    }
+
+    fun transactionKey(): String {
+        val prefix = "txrd"
+        val characters = ('0'..'9') + ('a'..'z')
+        val randomString = (1..24).map { characters.random() }.joinToString("")
+        return "${prefix}_${randomString}"
+    }
+}