Question

我无法控制我想要测试的方法中的变量。在此示例中，正在测试的方法的输入是模拟或可注入的对象，但如果您尝试对其执行任何操作，则会获得Null *异常。

正在测试的类和方法：

public class SomeClass {
    public SomeClass() {}

    public void myMethod(InputClass input) {
        //how do I set this field so that no matter what, I don't get an exeption?
        long someLong = Long.parseLong(input.getSomeLong());

        // how do I prevent the NumberFormatException when Long.parseLong() is called in this situation?
        SomeInnerClass innerClass = SomeInnerClass(Long.parseLong(input.getSomeLong()));
        // how do I prevent the NumberFormatException when Long.parseLong() is called in this situation?
        innerClass.doStuff(Long.parseLong(input.getSomeLong()));

        // ...
    }
}

测试类：

public class TestSomeClass {
    @Tested private SomeClass classBeingTested;
    @Injectable SomeInnerClass innerClass;
    @Injectable InputClass input; // doesn't matter if I use @mocked here

    @Test
    public void shouldTestSomething() {
        new NonStrictExpectations() {{
            // some expectations with innerClass...
        }};     

        classBeingTested.myMethod(input); // at this point I would get an error from Long.parsLong() 

        // ... 
    }
}

我希望能够忽略我正在测试的方法中代码的某些部分的错误。在这种特定情况下，我根本不关心Long.parseLong（）错误。我目前没有尝试测试，但它正在妨碍真正的测试。如何创建一个虚假对象，代替导致问题的对象，以便在测试方法的其他部分时可以忽略它？

Answer 1

请使用以下代码并检查是否有帮助。您需要在项目中添加对mockito的依赖。一个重要的想法是确保在测试类中使用@RunWith(MockitoJUnitRunner.class)。

@RunWith(MockitoJUnitRunner.class)
public class TestSomeClass {
    @Tested private SomeClass classBeingTested;
    @Injectable SomeInnerClass innerClass;
    @Mock
    InputClass input; // doesn't matter if I use @mocked here

    @Test
    public void shouldTestSomething() {
        new NonStrictExpectations() {{
            // some expectations with innerClass...
        }};     
        Mockito.when(input).getSomeLong().thenReturn("11").thenReturn("11");//This will return 11 in place of input.getSomeLong()for 2 times
        classBeingTested.myMethod(input); // In this case yoou will not get an error from Long.parsLong() 

        // ... 
    }
}

=============================================== ======

使用JMockit：

 import org.junit.Test;

import mockit.Injectable;
import mockit.Mocked;
import mockit.NonStrictExpectations;
import mockit.Tested;

public class SomeClassTest {
    @Tested
    private SomeClass classBeingTested;
    @Injectable
    SomeInnerClass innerClass;

    @Mocked
    InputClass input;

    @Test
    public void shouldTestSomething() {
        new NonStrictExpectations() {

            {
                input.getSomeLong();
                returns("11");
            }
        };

        classBeingTested.myMethod(input); 

        // ...
    }
}

Jmockit：无法模仿内场。总是最终为空

1 个答案: