Hamcrest:当iterableWithSize失败时，它会给出一条错误消息，例如"got:com.xxx.MyIterClass$1@1970ae0&".

问题描述

在hamcrest(1.3.RC2，没有JUnit依赖项)中，我无法在SpringDataNeo4j库中使用iterableWithSize().

In hamcrest (1.3.RC2, with no JUnit dependencies) I am failing using iterableWithSize() with a SpringDataNeo4j library.

我有一个Iterator(扩展名为)，像这样用Content参数化

I have an (extension of) an Iterator parameterized with Content like this

EndResult<Content> contents = contentRepository.findAllByPropertyValue("title", "*");

其中EndResult是

包org.springframework.data.neo4j.conversion;公共接口EndResult扩展了Iterable {...}

package org.springframework.data.neo4j.conversion; public interface EndResult extends Iterable {...}

和Content是@NodeEntity Pojo.

在马克·彼得斯(Mark Peters)的帮助下，我了解到我应该这样称呼

assertThat(contents, IsIterableWithSize.<Content>iterableWithSize(2));

，因为iterableWithSize是根据Iterable的组件类型键入的，而不是可迭代本身的具体类型.

since iterableWithSize is typed on the component type of your Iterable, not the concrete type of iterable itself.

但是运行测试时，我会得到

But when test is run I get

java.lang.AssertionError: Expected: 
an iterable with size <2> 
got: org.springframework.data.neo4j.conversion.QueryResultBuilder$1@1970ae0

试图找出是1)我做错了什么，还是2)hamcrest或3)Spring Data Neo4j有一个错误，我检查了手边的对象，并且看起来像Iterable一样还好:

Trying to figure out whether either 1) I am doing some thing wrong, or 2) hamcrest or 3) Spring Data Neo4j has an bug, I checked my object at hand, and it seems OK as an Iterable :

 public static int iterSize(Iterator iter){     
    int i=0;                        
    while (iter.hasNext()){ i++;iter.next();}                       
    return i; 
 }
 public static int iterSize(Iterable iter) {return iterSize(iter.iterator());}

 assertEquals("contents contain 2 items", 2, iterSize(contents)); // works OK

因此，我想它可能得出结论，认为它的棘手问题出了问题.有没有人尝试过与IsIterableWithSize类似的事情?

So I guess it possibly concludes that its hamcrest that has a problem. Has anyone tried anything similar with IsIterableWithSize ?

测试代码为 https ://github.com/anodynos/SpringDataNeo4jTrials/blob/master/src/test/java/sdnTests/test/HamcrestIteratorSizeTest.java

推荐答案

由于使用的是JUnit版本的assertThat，因此您看到的帮助不大.如果使用hamcrest随附的assertThat，则可以更好地描述不匹配情况.

You are seeing this less helpful message because you are using JUnit's version of assertThat. If you use the assertThat provided with hamcrest it is able to better describe the mismatch.

替换

import static org.junit.Assert.assertThat;

使用

import static org.hamcrest.MatcherAssert.assertThat;

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