Spock可以模拟一个Java构造函数 [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解决这个问题。实际上试图为Groovy类编写单元测试，但是需要调用Java。一个静态方法调用一个私有构造函数。代码如下所示：

pre $ private私人MyConfigurator ，
new OnReconnect（）{
@Override
public void command（）{。。。}
}）;




$ b $SolrZkClient来自第三方（Apache）Java库。由于它试图连接到ZooKeeper，我想嘲笑这个单元测试（而不是在内部作为单元测试的一部分运行）。

我的测试毫无困难地到达了构造函数，但是我无法超越那个ctor：

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


有没有办法做到这一点？

rel =nofollow> Mocking Constructors 在 Spock参考文档）。然而，更好的解决方案是分离 MyConfigurator 类的实现，以使其更具可测性。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 （或基础接口，如果有的话）的实例。然后你可以轻松地通过模拟。

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" 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).

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
}

Is there anyway to do this?

解决方案

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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