如何初始化模擬對象？

Question

可以說我有以下代碼：
嘲笑對象類

public class SomeClass { 
    private Foo someField; 
    public SomeClass { 
     someField = new Foo(); 
    } 
    public Foo getSomeField { return someField; } 
    public void getSomething() {} 
    public boolean doSomething(Object object) {} 
} 

接着我有測試套件

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); 
    } 
} 

和被測試方法

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 
} 

我卡住了..所以基本上SomeClass是不是像我想要的初始化。有什麼解決方法嗎？或者可能有其他的框架可以做到這一點？

Answer 1

您的methodToTest調用a.getSomeField()，但您的測試的設置部分不期望該調用。你想要的東西，如：

Foo foo = new Foo(); 
EasyMock.expect(mock.getSomeField()).andReturn(foo); 

或者存根電話：

Foo foo = new Foo(); 
EasyMock.expect(mock.getSomeField()).andStubReturn(foo); 

（你的電話之前，mock.getSomething()）。

有關andReturn和andStubReturn之間的差異，請參閱this question。