fixed the tests

adapters/cashpal-persistence/src/main/java/io/reflectoring/cashpal/adapter/persistence/AccountMapper.java

@@ -47,4 +47,14 @@ class AccountMapper {
 		return new ActivityWindow(mappedActivities);
 	}
 
+	ActivityJpaEntity mapToJpaEntity(Activity activity) {
+		return new ActivityJpaEntity(
+				activity.getId() == null ? null : activity.getId().getValue(),
+				activity.getTimestamp(),
+				activity.getOwnerAccountId().getValue(),
+				activity.getSourceAccountId().getValue(),
+				activity.getTargetAccountId().getValue(),
+				activity.getMoney().getAmount().longValue());
+	}
+
 }

adapters/cashpal-persistence/src/main/java/io/reflectoring/cashpal/adapter/persistence/AccountPersistenceAdapter.java

@@ -62,18 +62,9 @@ class AccountPersistenceAdapter implements
 	public void updateActivities(Account account) {
 		for (Activity activity : account.getActivityWindow().getActivities()) {
 			if (activity.getId() == null) {
-				activityRepository.save(mapToJpa(activity));
+				activityRepository.save(accountMapper.mapToJpaEntity(activity));
 			}
 		}
 	}
 
-	private ActivityJpaEntity mapToJpa(Activity activity) {
-		return new ActivityJpaEntity(
-				activity.getId() == null ? null : activity.getId().getValue(),
-				activity.getTimestamp(),
-				activity.getOwnerAccountId().getValue(),
-				activity.getSourceAccountId().getValue(),
-				activity.getTargetAccountId().getValue(),
-				activity.getMoney().getAmount().longValue());
-	}
 }

adapters/cashpal-web/src/main/java/io/reflectoring/cashpal/adapter/web/AccountResource.java

@@ -0,0 +1,4 @@
+package io.reflectoring.cashpal.adapter.web;
+
+class AccountResource {
+}

adapters/cashpal-web/src/main/java/io/reflectoring/cashpal/adapter/web/SendMoneyController.java

@@ -4,12 +4,9 @@ import io.reflectoring.cashpal.application.port.in.SendMoneyUseCase;
 import io.reflectoring.cashpal.application.port.in.SendMoneyUseCase.SendMoneyCommand;
 import io.reflectoring.cashpal.domain.Account.AccountId;
 import io.reflectoring.cashpal.domain.Money;
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.NoArgsConstructor;
 import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
-import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RestController;
 
 @RestController
@@ -18,24 +15,18 @@ public class SendMoneyController {
 
 	private final SendMoneyUseCase sendMoneyUseCase;
 
-	@PostMapping(path = "/sendMoney")
-	void sendMoney(@RequestBody SendMoneyForm form) {
+	@PostMapping(path = "/accounts/sendMoney/{sourceAccountId}/{targetAccountId}/{amount}")
+	void sendMoney(
+			@PathVariable("sourceAccountId") Long sourceAccountId,
+			@PathVariable("targetAccountId") Long targetAccountId,
+			@PathVariable("amount") Long amount) {
 
 		SendMoneyCommand command = new SendMoneyCommand(
-				new AccountId(form.sourceAccountId),
-				new AccountId(form.targetAccountId),
-				Money.of(form.amount));
+				new AccountId(sourceAccountId),
+				new AccountId(targetAccountId),
+				Money.of(amount));
 
 		sendMoneyUseCase.sendMoney(command);
 	}
 
-	@Data
-	@AllArgsConstructor
-	@NoArgsConstructor
-	public static class SendMoneyForm {
-		private Long sourceAccountId;
-		private Long targetAccountId;
-		private Long amount;
-	}
-
 }

adapters/cashpal-web/src/test/java/io/reflectoring/cashpal/adapter/web/SendMoneyControllerTest.java

@@ -1,7 +1,5 @@
 package io.reflectoring.cashpal.adapter.web;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-import io.reflectoring.cashpal.adapter.web.SendMoneyController.SendMoneyForm;
 import io.reflectoring.cashpal.application.port.in.SendMoneyUseCase;
 import io.reflectoring.cashpal.application.port.in.SendMoneyUseCase.SendMoneyCommand;
 import org.junit.jupiter.api.Test;
@@ -22,20 +20,11 @@ class SendMoneyControllerTest {
 	@MockBean
 	private SendMoneyUseCase sendMoneyUseCase;
 
-	private ObjectMapper jsonMapper = new ObjectMapper();
-
 	@Test
 	void testSendMoney() throws Exception {
 
-		SendMoneyForm form = new SendMoneyForm(
-				41L,
-				42L,
-				500L
-		);
-
-		mockMvc.perform(post("/sendMoney")
-				.header("Content-Type", "application/json")
-				.content(jsonMapper.writeValueAsString(form)))
+		mockMvc.perform(post("/accounts/sendMoney/{sourceAccountId}/{targetAccountId}/{amount}", 41L, 42L, 500)
+				.header("Content-Type", "application/json"))
 				.andExpect(status().isOk());
 
 		then(sendMoneyUseCase).should().sendMoney(any(SendMoneyCommand.class));

cashpal-application/src/main/java/io/reflectoring/cashpal/application/port/in/SendMoneyUseCase.java

@@ -17,15 +17,18 @@ public interface SendMoneyUseCase {
 	class SendMoneyCommand extends SelfValidating<SendMoneyCommand> {
 
 		@NotNull
-		private Account.AccountId sourceAccountId;
+		private final Account.AccountId sourceAccountId;
 
 		@NotNull
-		private Account.AccountId targetAccountId;
+		private final Account.AccountId targetAccountId;
 
 		@NotNull
-		private Money money;
+		private final Money money;
 
-		public SendMoneyCommand(Account.AccountId sourceAccountId, Account.AccountId targetAccountId, Money money) {
+		public SendMoneyCommand(
+				Account.AccountId sourceAccountId,
+				Account.AccountId targetAccountId,
+				Money money) {
 			this.sourceAccountId = sourceAccountId;
 			this.targetAccountId = targetAccountId;
 			this.money = money;

cashpal-application/src/main/java/io/reflectoring/cashpal/domain/Account.java

@@ -53,7 +53,9 @@ public class Account {
 	 * Calculates the total balance of the account by adding the activity values to the baseline balance.
 	 */
 	public Money calculateBalance() {
-		return Money.add(this.activityWindow.calculateBalance(this.id), this.baselineBalance);
+		return Money.add(
+				this.baselineBalance,
+				this.activityWindow.calculateBalance(this.id));
 	}
 
 	/**
@@ -63,22 +65,39 @@ public class Account {
 	 */
 	public boolean withdraw(Money money, AccountId targetAccountId) {
 
-		if(Money.add(this.calculateBalance(), money.negate()).isNegative()){
+		if (!mayWithdraw(money)) {
 			return false;
 		}
 
-		Activity withdrawal = new Activity(null, this.id, this.id, targetAccountId, LocalDateTime.now(), money);
+		Activity withdrawal = new Activity(
+				this.id,
+				this.id,
+				targetAccountId,
+				LocalDateTime.now(),
+				money);
 		this.activityWindow.addActivity(withdrawal);
 		return true;
 	}
 
+	private boolean mayWithdraw(Money money) {
+		return Money.add(
+				this.calculateBalance(),
+				money.negate())
+				.isPositiveOrZero();
+	}
+
 	/**
 	 * Tries to deposit a certain amount of money to this account.
 	 * If sucessful, creates a new activity with a positive value.
 	 * @return true if the deposit was successful, false if not.
 	 */
 	public boolean deposit(Money money, AccountId sourceAccountId) {
-		Activity deposit = new Activity(null, this.id, sourceAccountId, this.id, LocalDateTime.now(), money);
+		Activity deposit = new Activity(
+				this.id,
+				sourceAccountId,
+				this.id,
+				LocalDateTime.now(),
+				money);
 		this.activityWindow.addActivity(deposit);
 		return true;
 	}

cashpal-application/src/main/java/io/reflectoring/cashpal/domain/Activity.java

@@ -4,16 +4,18 @@ import java.time.LocalDateTime;
 
 import lombok.Getter;
 import lombok.NonNull;
+import lombok.RequiredArgsConstructor;
 import lombok.Value;
 
 /**
  * A money transfer activity between {@link Account}s.
  */
 @Value
+@RequiredArgsConstructor
 public class Activity {
 
 	@Getter
-	private final ActivityId id;
+	private ActivityId id;
 
 	/**
 	 * The account that owns this activity.
@@ -50,6 +52,20 @@ public class Activity {
 	@NonNull
 	private final Money money;
 
+	public Activity(
+			@NonNull Account.AccountId ownerAccountId,
+			@NonNull Account.AccountId sourceAccountId,
+			@NonNull Account.AccountId targetAccountId,
+			@NonNull LocalDateTime timestamp,
+			@NonNull Money money) {
+		this.id = null;
+		this.ownerAccountId = ownerAccountId;
+		this.sourceAccountId = sourceAccountId;
+		this.targetAccountId = targetAccountId;
+		this.timestamp = timestamp;
+		this.money = money;
+	}
+
 	@Value
 	public static class ActivityId {
 		private final Long value;

cashpal-application/src/main/java/io/reflectoring/cashpal/domain/Money.java

@@ -37,6 +37,14 @@ public class Money {
 		return new Money(a.amount.add(b.amount));
 	}
 
+	public Money minus(Money money){
+		return new Money(this.amount.subtract(money.amount));
+	}
+
+	public Money plus(Money money){
+		return new Money(this.amount.add(money.amount));
+	}
+
 	public static Money subtract(Money a, Money b) {
 		return new Money(a.amount.subtract(b.amount));
 	}

cashpal-application/src/test/java/io/reflectoring/cashpal/application/service/SendMoneyServiceTest.java

@@ -60,11 +60,8 @@ class SendMoneyServiceTest {
 	@Test
 	void transactionSucceeds() {
 
-		AccountId sourceAccountId = new AccountId(41L);
-		Account sourceAccount = givenAnAccountWithId(sourceAccountId);
-
-		AccountId targetAccountId = new AccountId(42L);
-		Account targetAccount = givenAnAccountWithId(targetAccountId);
+		Account sourceAccount = givenSourceAccount();
+		Account targetAccount = givenTargetAccount();
 
 		givenWithdrawalWillSucceed(sourceAccount);
 		givenDepositWillSucceed(targetAccount);
@@ -72,14 +69,17 @@ class SendMoneyServiceTest {
 		Money money = Money.of(500L);
 
 		SendMoneyCommand command = new SendMoneyCommand(
-				sourceAccountId,
-				targetAccountId,
+				sourceAccount.getId(),
+				targetAccount.getId(),
 				money);
 
 		boolean success = sendMoneyService.sendMoney(command);
 
 		assertThat(success).isTrue();
 
+		AccountId sourceAccountId = sourceAccount.getId();
+		AccountId targetAccountId = targetAccount.getId();
+
 		then(accountLock).should().lockAccount(eq(sourceAccountId));
 		then(sourceAccount).should().withdraw(eq(money), eq(targetAccountId));
 		then(accountLock).should().releaseAccount(eq(sourceAccountId));
@@ -121,6 +121,14 @@ class SendMoneyServiceTest {
 				.willReturn(true);
 	}
 
+	private Account givenTargetAccount(){
+		return givenAnAccountWithId(new AccountId(42L));
+	}
+
+	private Account givenSourceAccount(){
+		return givenAnAccountWithId(new AccountId(41L));
+	}
+
 	private Account givenAnAccountWithId(AccountId id) {
 		Account account = Mockito.mock(Account.class);
 		given(account.getId())