Modified test for creating a new account to check id (pass)

src/main/kotlin/camilyed/github/io/currencyexchangeapi/application/AccountService.kt

@@ -1,11 +1,18 @@
 package camilyed.github.io.currencyexchangeapi.application
 
 import camilyed.github.io.currencyexchangeapi.domain.Account
-import java.util.*
+import camilyed.github.io.currencyexchangeapi.domain.AccountRepository
 
-class AccountService {
+class AccountService(
+    private val repository: AccountRepository
+) {
 
     fun create(command: CreateAccountCommand): Account {
-        return Account(id = UUID.randomUUID(), owner = command.owner, balancePln = command.initialBalance)
+        val id = repository.nextAccountId()
+        return Account(
+            id = id,
+            owner = command.owner,
+            balancePln = command.initialBalance
+        )
     }
 }

src/main/kotlin/camilyed/github/io/currencyexchangeapi/domain/AccountRepository.kt

@@ -0,0 +1,8 @@
+package camilyed.github.io.currencyexchangeapi.domain
+
+import java.util.UUID
+
+interface AccountRepository {
+
+    fun nextAccountId(): UUID
+}

src/test/kotlin/camilyed/github/io/currencyexchangeapi/application/AccountServiceTest.kt

@@ -1,6 +1,8 @@
 package camilyed.github.io.currencyexchangeapi.application
 
 import camilyed.github.io.currencyexchangeapi.domain.Account
+import camilyed.github.io.currencyexchangeapi.testing.ability.SetNextAccountIdAbility
+import camilyed.github.io.currencyexchangeapi.testing.ability.SetNextAccountIdAbility.Companion.accountRepository
 import camilyed.github.io.currencyexchangeapi.testing.assertions.hasId
 import camilyed.github.io.currencyexchangeapi.testing.assertions.hasInitialBalance
 import camilyed.github.io.currencyexchangeapi.testing.assertions.hasOwner
@@ -12,13 +14,16 @@ import org.junit.jupiter.api.assertThrows
 import strikt.api.expectThat
 import java.math.BigDecimal
 
-class AccountServiceTest {
+class AccountServiceTest: SetNextAccountIdAbility {
 
-    private val accountService = AccountService()
+    private val accountService = AccountService(accountRepository)
 
     @Test
     fun `should create a new account with valid details`() {
         // given
+        theNextAccountIdWillBe("db59d3ba-5044-4ea9-85e2-aa1e67ec713c")
+
+        // and
         val command = anAccount()
             .withOwner("Jan Kowalski")
             .withInitialBalance(BigDecimal(1000.0))

src/test/kotlin/camilyed/github/io/currencyexchangeapi/testing/ability/SetNextAccountIdAbility.kt

@@ -0,0 +1,15 @@
+package camilyed.github.io.currencyexchangeapi.testing.ability
+
+import camilyed.github.io.currencyexchangeapi.testing.fakes.TestingAccountRepository
+import java.util.*
+
+interface SetNextAccountIdAbility {
+
+    fun theNextAccountIdWillBe(id: String) {
+        accountRepository.setNextId(UUID.fromString(id))
+    }
+
+    companion object {
+        val accountRepository = TestingAccountRepository()
+    }
+}

src/test/kotlin/camilyed/github/io/currencyexchangeapi/testing/fakes/TestingAccountRepository.kt

@@ -0,0 +1,17 @@
+package camilyed.github.io.currencyexchangeapi.testing.fakes
+
+import camilyed.github.io.currencyexchangeapi.domain.AccountRepository
+import java.util.*
+
+class TestingAccountRepository : AccountRepository {
+
+    private var nextID: UUID? = null
+
+    override fun nextAccountId(): UUID {
+        return nextID ?: UUID.randomUUID()
+    }
+
+    fun setNextId(id: UUID) {
+        this.nextID = id
+    }
+}