EasyMock on Spring jdbcTemplate is always returning null rather mocked object - spring

Question

I'm trying to use EasyMock 3.4 on a Java Spring project. I have successfully mocked all objects and tested the classes except a DAO which is using JDBCTemplate.
#RunWith(EasyMockRunner.class)
public class DummyDAOImplTest extends EasyMockSupport {
#TestSubject
private DummyDAOImpl dummyDAOImpl = new DummyDAOImpl ();
JdbcTemplate jdbcTemplateObject;
#Before
public void setUp(){
jdbcTemplateObject = EasyMock.createNiceMock(JdbcTemplate.class);
dummyDAOImpl.setJdbcTemplate(jdbcTemplateObject);
}
#Test
public void testGetApplicationConfigValueReturnNonNull(){
String query = "SELECT value FROM application_configuration WHERE tag=?";
String tag = "REFRESH_INTERVAL";
EasyMock.expect(jdbcTemplateObject.queryForObject(query,new Object[] {tag}, String.class)).andReturn("12");
EasyMock.replay(jdbcTemplateObject);
Assert.assertEquals(12,dummyDAOImpl.getApplicationConfigValue(tag));
}
}
public class ConfigurationDAOImpl implements ConfigurationDAO {
private JdbcTemplate jdbcTemplateObject;
#Override
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplateObject = jdbcTemplate;
}
#Override
public int getApplicationConfigValue(String tag) {
String query = "SELECT value FROM application_configuration WHERE tag=?";
String refreshTime = jdbcTemplateObject.queryForObject(query,new Object[] {tag}, String.class);
if(refreshTime != null && !"".equals(refreshTime))
return new Integer(refreshTime);
else
return 0;
}
}
Though in method testGetApplicationConfigValueReturnNonNull - I'm trying to mock it to return 12 but it always returns null.
It's the first time I'm using EasyMock. anything that I'm missing as already tried for and not able to crack it!
Best Regards,
Sundar

Answer 1

In fact, your only problem is your expectation line. It should be
EasyMock.expect(jdbcTemplateObject.queryForObject(eq(query), aryEq(new Object[] {tag}), eq(String.class))).andReturn("12");
By default, EasyMock will perform an equals on parameter to match the expectation. The things is that there are no equals defined for an array. So you need to specify a matcher for array (aryEq). And as soon as you have a matcher for an argument, you need to have one for all of them (for technical reasons).
The full code with some simplifications is below.
I assumed it is ConfigurationDAO that you want to test
You can replayAll since you are extending EasyMockSupport
You can use #Mock because of the runner
You do not need a nice mock. In fact, not using it here will have shown a nice exception about the unexpected call that would have been really helpful for you
The mock is now also injected by the EasyMockRunner
I prefer to add a verifyAll at the end of most of my tests. It makes sure that all expectations were used
Static imports because I think it's clearer to read
Code:
import static org.easymock.EasyMock.*;
import static org.junit.Assert.*;
#RunWith(EasyMockRunner.class)
public class DummyDAOImplTest extends EasyMockSupport {
#TestSubject
private ConfigurationDAOImpl dao = new ConfigurationDAOImpl();
#Mock
JdbcTemplate jdbcTemplateObject;
#Test
public void testGetApplicationConfigValueReturnNonNull(){
String query = "SELECT value FROM application_configuration WHERE tag=?";
String tag = "REFRESH_INTERVAL";
expect(jdbcTemplateObject.queryForObject(eq(query), aryEq(new Object[] {tag}), eq(String.class))).andReturn("12");
replayAll();
assertEquals(12, dao.getApplicationConfigValue(tag));
verifyAll();
}
}

Answer 2

Probably you need to load the Spring context
#ContextConfiguration(locations = "classpath:application-context-test.xml")
#RunWith(EasyMockRunner.class) public class DummyDAOImplTest extends EasyMockSupport { ...
Override your appplication-context like this
application-context-test.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context/ http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx/ http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"><import resource="application-context.xml"/><bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="org.hsqldb.jdbcDriver" />
<property name="url" value="jdbc:your-db-conection" />
<property name="username" value="" />
<property name="password" value="" />