java - 测试服务和 DAO 类 JUnit 时出现 NullPointerException
问题描述
我正在使用 JUnit 测试一个 DAO 类,我得到一个 nullpointerexception,我不知道为什么在我启动服务类时。以下是测试类:
public class RegisterTest {
private UserDaoImpl userservice = new UserDaoImpl();
@Mock
JdbcTemplate jdbcTemplate;
User user;
@Before
public void setUp() {
user = new User();
}
@Test
public void testSetAddress() {
user.setAddress("A");
assertEquals(user.getAddress(), "A");
}
@Test
public void testSetEmail() {
user.setEmail("B");
assertEquals(user.getEmail(), "B");
}
@Test
public void testSetFirstname() {
user.setFirstname("C");
assertEquals(user.getFirstname(), "C");
}
@Test
public void testSetLastname() {
user.setLastname("D");
assertEquals(user.getLastname(), "D");
}
@Test
public void testSetPassword() {
user.setPassword("E");
assertEquals(user.getPassword(), "E");
}
@Test
public void testSetUsername() {
user.setUsername("F");
assertEquals(user.getUsername(), "F");
}
@Test
public void testRegister() {
userservice.register(user);
String username = user.getUsername();
assertEquals(userservice.findByUsername(username), 1);
}
}
以下是UserDaoImpl
public class UserDaoImpl implements UserDao {
@Autowired
PasswordEncoder passwordEncoder;
@Autowired
DataSource datasource;
@Autowired
JdbcTemplate jdbcTemplate;
public List<User> findByUsername(String username) {
String sql = "select * from users where username='" + username +
"'";
List<User> users = jdbcTemplate.query(sql, new UserMapper());
return users;
}
public int register(User user) {
// If username is unique
String uniqueusername = "select * from users where username='" +
user.getUsername() + "'";
List<User> users = jdbcTemplate.query(uniqueusername, new
UserMapper());
if(users.size() == 0) {
// encode password
String encryptedPassword =
passwordEncoder.encode(user.getPassword());
// Updating database with new user
String sql = "insert into users values(?,?,?,?,?,?)";
return jdbcTemplate.update(sql, new Object[] {
user.getUsername(),
encryptedPassword,
user.getFirstname(),
user.getLastname(),
user.getEmail(),
user.getAddress() });
}
else {
return 0;
}
}
如何在测试类中注入类?我猜 nullpointerxeception 的原因是因为在测试类中没有正确注入 dao 类
解决方案
你应该用足够的跑步者来运行你的测试
RunWith(MockitoJunitRunner.class)
public class RegisterTest {
然后你需要在 DAO 中注入你的模拟
@InjectMocks
private UserDaoImpl userservice = new UserDaoImpl();
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