我想测试一个使用Mockito对其进行增强的
java方法.问题是当我不知道如何设定增强工作的期望.以下代码从
an unanswered question in the mockito google group获得：
import static org.mockito.Mockito.when;
import static org.testng.Assert.assertTrue;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.mockito.Mockito;
import org.testng.annotations.Test;
public class ListTest
{
@Test
public void test()
{
List<String> mockList = Mockito.mock(List.class);
Iterator<String> mockIterator = Mockito.mock(Iterator.class);
when(mockList.iterator()).thenReturn(mockIter);
when(mockIter.hasNext()).thenReturn(true).thenReturn(false);
when(mockIter.next()).thenReturn("A");
boolean flag = false;
for(String s : mockList) {
flag = true;
}
assertTrue(flag);
}
}
for循环中的代码不会被执行.设置迭代器的期望不起作用,因为java enhanced for不在内部使用list iterator.设置List.get()方法的期望不是因为增强的实现似乎也不调用列表的get()方法.
任何帮助将不胜感激.
解决方法
模拟迭代器为我工作.见下面的代码示例：
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import java.util.Collection;
import java.util.Iterator;
import org.junit.Before;
import org.junit.Test;
public class TestMockedIterator {
private Collection<String> fruits;
private Iterator<String> fruitIterator;
@SuppressWarnings("unchecked")
@Before
public void setUp() {
fruitIterator = mock(Iterator.class);
when(fruitIterator.hasNext()).thenReturn(true,true,false);
when(fruitIterator.next()).thenReturn("Apple")
.thenReturn("Banana").thenReturn("Pear");
fruits = mock(Collection.class);
when(fruits.iterator()).thenReturn(fruitIterator);
}
@Test
public void test() {
int iterations = 0;
for (String fruit : fruits) {
iterations++;
}
assertEquals(3,iterations);
}
}