Should Not Create Account when Id is null

src/main/java/hs/fulda/de/ci/exam/project/Account.java

@@ -75,6 +75,21 @@ public class Account {
         accountRepository.addPersonalDetails(person, id);
     }
 
+    public void validateId() {
+        if(this.id.isBlank())
+            throw new RuntimeException(("Id Cannot be null or empty"));
+    }
+
+    public void validatePassword(){
+        if(this.password.isBlank())
+            throw new RuntimeException(("Id Cannot be null or empty"));
+    }
+
+    public void validateAccountStatus(){
+        if(this.status.equals(null))
+            throw new RuntimeException(("Id Cannot be null or empty"));
+    }
+
 }
 class PasswordEncoder{
     String encode(String password){

src/main/java/hs/fulda/de/ci/exam/project/AccountService.java

@@ -1,5 +1,7 @@
 package hs.fulda.de.ci.exam.project;
 
+import java.util.Date;
+
 public class AccountService {
     private final AccountRepository accountRepository;
     private final PasswordEncoder passwordEncoder;
@@ -21,4 +23,23 @@ public class AccountService {
         String encodedPassword = passwordEncoder.encode(password);
         return encodedPassword.equals(account.getPasswordHash());
     }
+    public void validateAccount(Account account){
+        account.validateAccountStatus();
+        account.validateId();
+        account.validatePassword();
+    }
+
+    public void checkIfAccountAlreadyExist(Account account){
+        if(accountRepository.checkIfAccountAlreadyExist(account)){
+            throw new RuntimeException("Account Already Exists");
+        }
+    }
+    public void createAccount(String id, String password, Account.AccountStatus accountStatus){
+        Account account = new Account(id, password, accountStatus);
+        validateAccount(account);
+        checkIfAccountAlreadyExist(account);
+        accountRepository.save(account);
+    }
+
+
 }

src/test/java/hs/fulda/de/ci/exam/project/AccountServiceTest.java

@@ -2,9 +2,13 @@ package hs.fulda.de.ci.exam.project;
 
 import org.junit.Before;
 import org.junit.Test;
+import org.junit.jupiter.api.DisplayName;
 import org.mockito.ArgumentCaptor;
 import org.mockito.InOrder;
 
+import java.util.ArrayList;
+import java.util.Date;
+
 import static org.junit.jupiter.api.Assertions.*;
 import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.*;
@@ -95,4 +99,12 @@ public class AccountServiceTest {
         return mock;
     }
 
+    @Test
+    @DisplayName("Should Not Create Account when Id is null")
+    public void shouldThrowRuntimeExceptionWhenIdIsNull(){
+        assertThrows(RuntimeException.class, () -> {
+            accountService.createAccount(null, "pwd", Account.AccountStatus.ACTIVE);
+        });
+    }
+
 }