Mockito:模拟将在 for 循环中循环的数组列表

问题描述

我有一个正在测试的方法，其中包含以下代码段:

I have a method under test that contains the following snippet:

private void buildChainCode(List<TracedPath> lines){
    for(TracedPath path : lines){
        /.../
    }
}

我的单元测试代码如下所示:

My unit test code looks like this:

public class ChainCodeUnitTest extends TestCase {

    private @Mock List<TracedPath> listOfPaths;
    private @Mock TracedPath tracedPath;

    protected void setUp() throws Exception {
        super.setUp();
        MockitoAnnotations.initMocks(this);
    }

    public void testGetCode() {
        when(listOfPaths.get(anyInt())).thenReturn(tracedPath);

        ChainCode cc = new ChainCode();
        cc.getCode(listOfPaths);

        /.../
    }
}

问题是，在运行测试时，测试代码永远不会进入 for 循环.我应该在什么情况下指定条件，以便进入 for 循环?目前我已经指定了 when(listOfPaths.get(anyInt())).thenReturn(tracedPath)，但我猜它从未使用过.

The problem is, that while running the test, the test code never enters the for loop. What when conditions should I specify, so that the for loop would be entered? Currently I have specified when(listOfPaths.get(anyInt())).thenReturn(tracedPath), but I guess it is never used.

推荐答案

你的问题是当你在for-each循环中使用一个集合时，它的iterator()方法被调用了；而且您还没有使用该特定方法.

Your problem is that when you use a collection in a for-each loop, its iterator() method gets called; and you haven't stubbed that particular method.

我强烈建议您不要模拟列表，而是传递一个真实的列表，其中的元素只是您模拟的 TracedPath，任意多次.像

Instead of mocking the list, I strongly recommend you just pass a real list, where the elements are just your mocked TracedPath, as many times as you want it. Something like

listOfPaths = Arrays.asList(mockTracedPath, mockTracedPath, mockTracedPath);

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