EasyMock to test exceptions - dao

Question

I am trying to test with EasyMock the service layer by mocking the DAO.
One of the methods in my DAO class is shown below.
public BrickStreamUserVO getUserDetails(String userName, String password)
{
BrickStreamUserVO usrObj = null;
try
{
String sqlStr = "SELECT * FROM USER_T WHERE USER_NAME LIKE '" + userName + "'
AND PASSWORD = '" + password + "'";
usrObj = getJdbcTemplate().queryForObject(sqlStr, new BrickStreamUserMapper());
logger.info("Getting user details....");
if(usrObj==null)
throw new UserException("Invalid Login parameters");
}
catch (Exception e)
{
logger.error(e);
throw new UserException("Invalid Login parameters");
}
return usrObj;
}
And here is my test code
public class BrickStreamServiceImplTest
{
private BrickStreamServiceImpl serviceImpl;
#Before
public void buildService()
{
serviceImpl = new BrickStreamServiceImpl();
}
#Test
public void testGetUserDetails()
{
BrickStreamDaoImpl daoImplMock = createMock(BrickStreamDaoImpl.class);
expect(daoImplMock.getUserDetails("user", "pwd")).
andReturn(new BrickStreamUserVO());
replay(daoImplMock);
serviceImpl.setBrickStreamDao(daoImplMock);
serviceImpl.getUserDetails("user", "pwd");
verify(daoImplMock);
}
}
How can I test the method to throw the UserException, you can see that if the usrObj object is null it throws a UserException.

Answer 1

If you mock the getUserDetails method, you won't be able to test its behavior.
You may want to extract a method where you do the user query, and mock it.
public BrickStreamUserVO queryForUser(String userName, String password) {
String sqlStr = "SELECT * FROM USER_T WHERE USER_NAME LIKE '" + userName + "'
AND PASSWORD = '" + password + "'";
return getJdbcTemplate().queryForObject(sqlStr, new BrickStreamUserMapper());
}
public BrickStreamUserVO getUserDetails(String userName, String password)
{
BrickStreamUserVO usrObj = null;
try
{
usrObj = queryForUser(userName, password);
logger.info("Getting user details....");
if(usrObj==null) {
throw new UserException("Invalid Login parameters");
}
} catch (Exception e) {
logger.error(e);
throw new UserException("Invalid Login parameters");
}
return usrObj;
}
In your test class :
#Test(expected = UserException.class)
public void testGetUserDetails()
{
BrickStreamDaoImpl daoImplMock = createMockBuilder(BrickStreamDaoImpl.class).addMockedMethod("queryForUser").createMock();
expect(daoImplMock.queryForUser("user", "pwd")).andReturn(null);
replay(daoImplMock);
serviceImpl.setBrickStreamDao(daoImplMock);
serviceImpl.getUserDetails("user", "pwd");
}