Java 如何初始化模拟对象?
假设我有以下代码:Java 如何初始化模拟对象?,java,unit-testing,junit,mocking,easymock,Java,Unit Testing,Junit,Mocking,Easymock,假设我有以下代码: 模拟对象类 public class SomeClass { private Foo someField; public SomeClass { someField = new Foo(); } public Foo getSomeField { return someField; } public void getSomething() {} public boolean doSomething(Object
模拟对象类
public class SomeClass {
private Foo someField;
public SomeClass {
someField = new Foo();
}
public Foo getSomeField { return someField; }
public void getSomething() {}
public boolean doSomething(Object object) {}
}
接下来我有测试套件
public class TestSuite {
private ClassToTest classToTest;
private SomeClass mock;
@Before
public void setUp() {
classToTest = new ClassToTest();
mock = EasyMock.createMock(SomeClass.class);
}
@Test
public void testMethod() throws Exception {
mock.getSomething();
EasyMock.replay(mock);
classToTest.methodToTest(mock); //Where methodToTest accepts SomeClass and int
EasyMock.verify(mock);
}
}
和正在测试的方法
public void methodToTest(SomeClass a) {
//Logic here
Foo b = a.getSomeField();
b.do(); // <--- null pointer exception here because someField isn't initialized
a.getSomething(); // <--- thing I want to test if it is being called, but can't due to exception prior to this line
//Logic after
}
public void methodToTest(a类){
//这里的逻辑
Foo b=a.getSomeField();
b、 do();//您的方法测试调用a.getSomeField()
,但测试的设置部分不希望调用该调用。您需要类似以下内容:
Foo foo = new Foo();
EasyMock.expect(mock.getSomeField()).andReturn(foo);
或要取消呼叫:
Foo foo = new Foo();
EasyMock.expect(mock.getSomeField()).andStubReturn(foo);
(在调用mock.getSomething()
之前)
查看andReturn
和andStubReturn
之间的区别,你是对的,我也忘了测试它。但事实并非如此。问题是,你可以看到我的构造函数初始化someField
,当我进行模拟时,someField
为空,因此整个methodToTest
中断。这意味着构造函数没有被调用?@su234fk234hawuhsafklsfjs:你的正常实现所做的是无关的。你在模拟那个类,所以它的行为无关紧要。只要你模拟你正在进行的调用,以便getSomeField()
返回一个非空引用,这很好。但问题是getSomeField();
确实返回空引用,因为SomeClass
初始化someField
没有其他设置程序。如果b.do()抛出NPE,我不明白如何通过测试
@su234fk234hawuhsafklsfjs:如果您告诉EasyMock返回不同的内容,它不会返回null。这就是我回答中代码的重点。您尝试过这个解决方案吗?啊,现在我明白了,谢谢。我会尝试,明天通知您