Mockito：嘲笑一个将在for循环中循环的arraylist [英] Mockito: mocking an arraylist that will be looped in a for loop

问题描述

我有一个测试方法，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。什么时候我应该指定条件，以便输入for循环？目前我已指定 when（listOfPaths.get（anyInt（）））。thenReturn（tracedPath），但我想它从未使用过。

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;而且你还没有找到那个特定的方法。

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.

我强烈建议您只传递一个真实的列表，而不是模拟列表，其中元素只是您的模拟 TracedPath ，根据你的需要多次。类似

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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