### Question:
UserDatabaseModelJpa implements UserDatabaseModel, Serializable { public User getUserByEmail(String email) { UserEntity userEntity = userEntityDao.findByEmail(email); if (userEntity == null) { return null; } return userEntity.toUser(); }  @Transactional boolean addPasswordResetToken(PasswordResetToken token); @Transactional int addUser(User newUser); @Transactional boolean cancelAllPasswordResetTokens(int userId); @Transactional boolean confirmUserRegistration(String email); @Transactional boolean deleteUser(int userId); @Transactional int getRegisteredUserCount(Date since); PasswordResetToken getNewestPasswordResetToken(String email); User getUserByEmail(String email); User getUserByName(String name); User getUserBySocialAccount(SocialAccountDetails details); int getUserIdByEmail(String email); UserPassword getUserPassword(int userId); boolean isEmailRegistered(String email); boolean isUserNameRegistered(String name); @Transactional boolean makeLogInRecord(int userId, boolean logInSuccessfull, String usersIp); @Transactional int saveUserWithSocialAccount(User user, SocialAccountDetails details); @Transactional boolean setUserPassword(int userId, UserPassword password);  }### Answer:
@Test public void testGetUserByEmail() throws DatabaseUnitException, SQLException, Exception { fillDatabase("userDatabaseModelHbnTest/userList.xml"); User result = databaseModel.getUserByEmail("non-existing@test.com"); assertEquals(null, result); result = databaseModel.getUserByEmail("allan@test.com"); assertEquals(null, result); result = databaseModel.getUserByEmail("john@test.com"); assertNotNull(result); assertEquals(1, result.getId()); }