Spock 可以模拟 Java 构造函数吗 [英] Can Spock Mock a Java constructor

问题描述

试图扩大 Spock 在工作中的吸引力并遇到了这个问题.实际上试图为 Groovy 类编写单元测试，但需要调用 Java.静态方法调用私有构造函数.代码如下:

Trying to broaden the appeal of Spock at work and run into this issue. Actually trying to write Unit Tests for a Groovy class, but one that calls out to Java. A static method calls a private constructor. The code looks like:

private MyConfigurator(String zkConnectionString){
    solrZkClient = new SolrZkClient(zkConnectionString, 30000, 30000,
            new OnReconnect() {
                @Override
                public void command() { . . . }
            });
}

SolrZkClient"来自第三方 (Apache) Java 库.由于它尝试连接到 ZooKeeper，我想为此单元测试模拟它(而不是在内部运行一个作为单元测试的一部分).

"SolrZkClient" is from third party (Apache) Java library. Since it tries to connect to ZooKeeper, I would like to mock that out for this Unit Test (rather than running one internally as part of the unit test).

我的测试毫无困难地到达构造函数，但我无法通过那个构造函数:

My test gets to the constructor without difficulty, but I can't get past that ctor:

def 'my test'() {
    when:
        MyConfigurator.staticMethodName('hostName:2181')
    then:
        // assertions
}

有没有办法做到这一点?

Is there anyway to do this?

推荐答案

由于被测类是用 Groovy 编写的，您应该能够通过全局 Groovy Mock/Stub/Spy 来模拟构造函数调用(请参阅 <Spock 参考文档).但是，更好的解决方案是将 MyConfigurator 类的实现解耦，以使其更易于测试.例如，您可以添加第二个构造函数和/或静态方法，以允许传递 SolrZkClient 的实例(或基本接口，如果有的话).然后你可以很容易地传入一个模拟.

Since the class under test is written in Groovy, you should be able to mock the constructor call by way of a global Groovy Mock/Stub/Spy (see Mocking Constructors in the Spock Reference Documentation). However, a better solution is to decouple the implementation of the MyConfigurator class, in order to make it more testable. For example, you could add a second constructor and/or static method that allows to pass an instance of SolrZkClient (or a base interface, if there is one). Then you can easily pass in a mock.

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