Always do a strong assertion against the returned state from a unit. Avoid assertion like the collection size shall be greater than zero. A better assertion could be checking the size of the collection and content of the collection.

Complete source code can be found here.

package com.ourownjava.unit.under.test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import com.ourownjava.model.Apple;
/**
*
* @author Sanju Thomas
*
*/
public class AppleServiceTest {
private AppleService appleService;
@Before
public void setUp(){
appleService = new AppleService();
}
@Test
public void shouldGet100ApplesBadAssertion(){
final List apples = appleService.getApple(100);
assertNotNull(apples);
}
@Test
public void shouldGet100ApplesBadAssertion1(){
final List apples = appleService.getApple(100);
assertTrue(apples.size() > 0);
}
@Test
public void shouldGet100ApplesGoodAssertion(){
final List apples = appleService.getApple(100);
assertEquals(100, apples.size());
}
}
package com.ourownjava.unit.under.test;
import java.util.ArrayList;
import java.util.List;
import com.ourownjava.model.Apple;
/**
*
* @author Sanju Thomas
*
*/
public class AppleService {
public List getApple(final Integer numberOfApples){
final List apples = new ArrayList();
for(int i = 0; i < numberOfApples; i++){
final Apple apple = new Apple();
apples.add(apple);
}
return apples;
}
}
package com.ourownjava.model;
/**
*
* @author Sanju Thomas
*
*/
public class Apple {}

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