The problem is FooServiceImp.peocess() calls FooBarService.process() method which I don't want to test with this peticular Unit test.
So how do I test just FooServiceImp.process() method without testing FooBarService. EasyMock is to rescue. Before the testing I can replace the reference of FooBarService to a EasyMock object and add certain expected behavior to the Mock.
Behaviors I like to add to mock:
1. The return value of the Mock service.
2. Capture the parameters passed to the Mock
Service.
3. Add a Exception to test Exception scenario
Here are the codes. Happy Unit Testing:
FooServiceTest.java
import static org.junit.Assert.*;
import java.util.List;
import org.easymock.Capture;
import org.easymock.EasyMock;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@ContextConfiguration(locations = { "classpath:Foo.xml" })
@RunWith(SpringJUnit4ClassRunner.class)
public class FooServiceTest
{
//Get a reference of FooServiceImp from Spring contexts
@Autowired
FooServiceImp fooService;
@Before
public void setUp()
throws Exception
{
//Replace with EasyMock object
fooService.fooBarService = EasyMock.createNiceMock(FooBarService.class);
}
/*
* Test the regular scenario
*/
@Test
public void testFooService() throws Exception{
//Creating a input value of String array
String[] values = {"value1","value2", "value3"};
//Create Easymock Capture type to capture the
Capture<List<String>> captureValues = new Capture<List<String>>();
//Setting behavior for the Mock service.
EasyMock.expect(fooService.fooBarService.process( EasyMock.capture(captureValues))).andReturn("value1");
EasyMock.replay(fooService.fooBarService);
//Test the return value
assertEquals(fooService.process(values),"value1");
EasyMock.verify(fooService.fooBarService);
//Check the parameters on Mock service call
assertEquals(captureValues.getValue().get(0),"value1");
}
/*
* Test the Exception scenario
*/
@Test(expected = Exception.class)
public void testFooServiceException() throws Exception{
EasyMock.reset(fooService.fooBarService);
String[] values = {"value1","value2", "value3"};
Capture<List<String>> captureValues = new Capture<List<String>>();
//Setting the expected Exception on the Mock service
EasyMock.expect(fooService.fooBarService.process( EasyMock.capture(captureValues))).andThrow(new Exception());
EasyMock.replay(fooService.fooBarService);
//Should get an exception to pass the test
fooService.process(values);
}
}
FooService.java
public interface FooService
{
public String process(String[] values) throws Exception;
}
FooServiceImp.java
import java.util.Arrays;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
public class FooServiceImp
implements FooService
{
@Autowired
FooBarService fooBarService;
@Override
public String process(String[] values) throws Exception
{
List<string> arrayList = Arrays.asList(values);
System.out.println(arrayList);
return fooBarService.process((List<string>)Arrays.asList(values));
}
}
FooBarService.java
import java.util.List;
public interface FooBarService
{
public String process(List<String> values) throws Exception;
}
FooBarServiceImp.java:
import java.util.List;
public class FooBarServiceImp
implements FooBarService
{
@Override
public String process(List<String> values) throws Exception
{
System.out.println("In FooBar" + values.get(0));
return values.get(0);
}
}
Foo.xml - Spring conf file
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:jms="http://www.springframework.org/schema/jms" xmlns:amq="http://activemq.apache.org/schema/core" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms.xsd http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd"> <bean id="fooService" primary="true" class="com.icrossing.service.FooServiceImp"> </bean> <bean id="fooBarService" primary="true" class="com.icrossing.service.FooBarServiceImp"> </bean> </beans>
