Java JMockit 模拟构造函数
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JMockit mock constructor
提问by userx
I am unit testing a class which has a complicated constructor ( with lots of parameters ). Constructor takes three arguments like :
我正在对一个具有复杂构造函数（带有很多参数）的类进行单元测试。构造函数采用三个参数，如：
public BehavioralDischargeCarePlan_Bus(Webform webForm,String dataEntryModel, String obsBatId) {
super(webForm, dataEntryModel, obsBatId);
.....
The constructor then calls a super constructor which gets even more complex. Using JMockit, how can I create an instance of the class and test a method without actually invoking the constructors ? I am new to JMockit, any help will be appreciated.
构造函数然后调用一个超级构造函数，它变得更加复杂。使用 JMockit，如何在不实际调用构造函数的情况下创建类的实例并测试方法？我是 JMockit 的新手，任何帮助将不胜感激。
Thanks !
谢谢 ！
采纳答案by joescii
If I've understood you correctly, you want to test a class with a mocked constructor. This is not a good approach to testing because you aren't testing the production code in its purest form.
如果我对你的理解正确的话，你想用一个模拟的构造函数来测试一个类。这不是一种很好的测试方法，因为您没有以最纯粹的形式测试生产代码。
However, not everything goes according to the rules, does it? :) So if you insist, JMockIt will let you do this. You can mock out just the constructor and test the other methods. Mocking constructors is well-documented at the JMockIt project site.
然而，并非一切都按照规则进行，不是吗？:) 所以如果你坚持，JMockIt 会让你这样做。您可以只模拟构造函数并测试其他方法。Mocking 构造函数在JMockIt 项目站点中有详细记录。
Here is a quick demonstration you can try yourself:
这是您可以自己尝试的快速演示：
Production code:
生产代码：
// src/main/java/pkg/SomeClass.java
public class SomeClass {
public static void main(String[] args) {
new SomeClass("a", 2);
}
public SomeClass(String a, Integer b) {
System.out.println("Production constructor called");
}
}
Mock code:
模拟代码：
// src/test/java/pkg/SomeMock.java
import mockit.Mock;
import mockit.MockUp;
public class SomeMock extends MockUp<SomeClass> {
@Mock
public void $init(String a, Integer b) {
System.out.println("Mock constructor called");
}
}
Test code:
测试代码：
// srce/test/java/pkg/SomeTest.java
import org.junit.Test;
public class SomeTest {
@Test
public void test() {
new SomeMock();
new SomeClass("a", 2);
}
}
Running the production code will print Production constructor called, but running it under test will print Mock constructor called.
运行生产代码将打印Production constructor called，但在测试下运行将打印Mock constructor called。
