基于参数属性的模拟返回值

2022-01-14 00:00:00 mockito java

通常在使用 mockito 时，我会做类似的事情

Normally when using mockito I will do something like

Mockito.when(myObject.myFunction(myParameter)).thenReturn(myResult);

有没有可能做一些类似的事情

Is it possible to do something along the lines of

myParameter.setProperty("value");
Mockito.when(myObject.myFunction(myParameter)).thenReturn("myResult");

myParameter.setProperty("otherValue");
Mockito.when(myObject.myFunction(myParameter)).thenReturn("otherResult");

所以而不是仅仅使用参数来确定结果.它使用参数内的属性值来确定结果.

So rather than when just using the parameter to determine the result. It is using a value of a property inside the parameter to determine the result.

所以当代码执行时，它的行为是这样的

so when the code is executed it behaves like so

public void myTestMethod(MyParameter myParameter,MyObject myObject){
    myParameter.setProperty("value");
    System.out.println(myObject.myFunction(myParameter));// outputs myResult

    myParameter.setProperty("otherValue");
    System.out.println(myObject.myFunction(myParameter));// outputs otherResult
}

<小时>

目前的解决方案，希望可以提出更好的建议.

current solution, hopefully something better can be suggested.

private class MyObjectMatcher extends ArgumentMatcher<MyObject> {

    private final String compareValue;

    public ApplicationContextMatcher(String compareValue) {
        this.compareValue= compareValue;
    }

    @Override
    public boolean matches(Object argument) {
        MyObject item= (MyObject) argument;
        if(compareValue!= null){
            if (item != null) {
                return compareValue.equals(item.getMyParameter());
            }
        }else {
            return item == null || item.getMyParameter() == null;
        }
        return false;
    }
}

public void initMock(MyObject myObject){
    MyObjectMatcher valueMatcher = new MyObjectMatcher("value");
    MyObjectMatcher otherValueMatcher = new MyObjectMatcher("otherValue");
    Mockito.when(myObject.myFunction(Matchers.argThat(valueMatcher))).thenReturn("myResult");
    Mockito.when(myObject.myFunction(Matchers.argThat(otherValueMatcher))).thenReturn("otherResult");
}

推荐答案

这是一种方法.这使用 Answer 对象来检查属性的值.

Here's one way of doing it. This uses an Answer object to check the value of the property.

@RunWith(MockitoJUnitRunner.class)
public class MyTestClass {
    private String theProperty;
    @Mock private MyClass mockObject;

    @Before
    public void setUp() {
        when(mockObject.myMethod(anyString())).thenAnswer(
            new Answer<String>(){
            @Override
            public String answer(InvocationOnMock invocation){
                if ("value".equals(theProperty)){
                    return "result";
                }
                else if("otherValue".equals(theProperty)) {
                    return "otherResult";
                }
                return theProperty;
            }});
    }
}

还有一种我更喜欢的替代语法，它可以实现完全相同的效果.由你选择其中的哪一个.这只是 setUp 方法 - 测试类的其余部分应该与上面相同.

There's an alternative syntax, which I actually prefer, which will achieve exactly the same thing. Over to you which one of these you choose. This is just the setUp method - the rest of the test class should be the same as above.

@Before
public void setUp() {
    doAnswer(new Answer<String>(){
        @Override
        public String answer(InvocationOnMock invocation){
            if ("value".equals(theProperty)){
                return "result";
            }
            else if("otherValue".equals(theProperty)) {
                return "otherResult";
            }
            return theProperty;
        }}).when(mockObject).myMethod(anyString());
}

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