account should be valid for valid credentials

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

@@ -1,10 +1,11 @@
 package hs.fulda.de.ci.exam.project;
 
 import org.junit.Before;
+import org.junit.Test;
 
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.anyString;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
+import static org.mockito.Mockito.*;
 
 public class AccountServiceTest {
     private static final String PASSWORD = "password";
@@ -26,6 +27,16 @@ public class AccountServiceTest {
         accountService = new AccountService(accountRepository, passwordEncoder);
     }
 
+    @Test
+    public void shouldBeValidForValidCredentials(){
+        boolean accountIsValid = accountService.isValidAccount(ENABLED_USER.getId(), PASSWORD);
+        assertTrue(accountIsValid);
+
+        verify(accountRepository).findById(ENABLED_USER.getId());
+
+        verify(passwordEncoder).encode(PASSWORD);
+    }
+
     private AccountRepository createAccountRepository() {
         AccountRepository mock = mock(AccountRepository.class);
         when(mock.findById(ENABLED_USER.getId())).thenReturn(ENABLED_USER);