infinity money bug :D

This is here to show a small miss with big problems.

- add missing test to
  - TransactionEndpoints
  - TransactionControllerTest
- update Transfer with validation for sender receiver
- add SenderReceiverValidator
- add SenderReceiver

src/test-integration/kotlin/ltd/lulz/TransactionEndpoints.kt

@@ -195,6 +195,25 @@ class TransactionEndpoints {
             result.expectStatus().isEqualTo(CREATED)
         }
 
+        @Test
+        fun `deposit - fail same account`() {
+            // given
+            val request = Transfer.Request(
+                account = UUID.fromString("00000000-0000-7000-0000-000000000001"),
+                receiver = UUID.fromString("00000000-0000-7000-0000-000000000001"),
+                amount = BigDecimal.valueOf(1.00),
+            )
+
+            // when
+            val result = webClient.post()
+                .uri("/transfer")
+                .bodyValue(request)
+                .exchange()
+
+            // then
+            result.expectStatus().isEqualTo(BAD_REQUEST)
+        }
+
         @Test
         fun `deposit - fail amount to small`() {
             // given