feat: update specs and add auth service test

src/test/java/com/mzh/library/service/AuthServiceCheck.java

@@ -10,6 +10,8 @@ import com.mzh.library.service.impl.AuthServiceImpl;
 import com.mzh.library.util.PasswordHasher;
 
 import java.util.Optional;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 public final class AuthServiceCheck {
     private static final String REQUIRED_MESSAGE = "Username and password are required.";
@@ -21,6 +23,8 @@ public final class AuthServiceCheck {
     }
 
     public static void main(String[] args) {
+        Logger.getLogger(AuthServiceImpl.class.getName()).setLevel(Level.OFF);
+
         User admin = user(1L, "admin", "System Administrator", Role.ADMINISTRATOR, "correct-password");
         AuthService authService = new AuthServiceImpl(username -> "admin".equals(username)
             ? Optional.of(admin)