Mockito 中的可选存根

发布于 2024-12-05 19:30:52 字数 1150 浏览 1 评论 0原文

我想在测试类的超类中创建一个方法，该方法在测试类中存根一些常用的方法，但其中一些方法可能不存在。

例如，我有一个像这样的类层次结构：

abstract class A {
    void search(); // implemented by subclass

    String getFoo() { return "REAL FOO"; }
}

class B extends A {
    void search() {
        getFoo();
    }   
}

class C extends A {
    void search() {
        getFoo();
        getBar();
    }   

    String getBar() { return "REAL BAR"; }
}

A 有大量的子类（生成骨架的工具），因此我想创建一个超类以方便我测试：

abstract class AbstractSearchTest {
    A underTest;

    @Test void test() {
        doReturn( "FOO" ).when( underTest ).getFoo();
        doReturn( "BAR" ).when( underTest, "getBar" ); // THE PROBLEM!

        underTest.search();
    }
}

class BSearchTest extends AbstractSearchTest {
    BSearchTest() {
        underTest = new B();
    }
}

class CSearchTest extends AbstractSearchTest {
    CSearchTest() {
        underTest = new C();
    }
}

这基本上是说，“在调用 search()，存根 getFoo() 哦，如果子类碰巧有 getBar()，也存根它。” 但我不能这样做，因为它会抛出org.powermock.reflect.exceptions.MethodNotFoundException。如何做到这一点？

原文

I want to create a method in superclass of test-class that stubs some commonly used methods in under-test-classes but some of those methods might not exist.

For example, I have a class hierarchy like this:

abstract class A {
    void search(); // implemented by subclass

    String getFoo() { return "REAL FOO"; }
}

class B extends A {
    void search() {
        getFoo();
    }   
}

class C extends A {
    void search() {
        getFoo();
        getBar();
    }   

    String getBar() { return "REAL BAR"; }
}

There are tons of subclasses of A (a tool generated the skeleton) thus I want to create a superclass to make it easier for me to test:

abstract class AbstractSearchTest {
    A underTest;

    @Test void test() {
        doReturn( "FOO" ).when( underTest ).getFoo();
        doReturn( "BAR" ).when( underTest, "getBar" ); // THE PROBLEM!

        underTest.search();
    }
}

class BSearchTest extends AbstractSearchTest {
    BSearchTest() {
        underTest = new B();
    }
}

class CSearchTest extends AbstractSearchTest {
    CSearchTest() {
        underTest = new C();
    }
}

Which basically says, "Before invoking search(), stub getFoo(). Oh, if the subclass happen to have getBar(), stub it too."
But I can't do that since it'll throw org.powermock.reflect.exceptions.MethodNotFoundException. How to do this?

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白馒头 2024-12-12 19:30:52

使用反射来确定该类是否已实现。

try{
    Method m = underTest.getClass().getMethod("getBar");
    // no exception means the method is implememented
    // Do your mocking here
    doReturn( "BAR" ).when( underTest, "getBar" );
}catch(NoSuchMethodException e){}

Use reflection to determine if the class is implemented.

try{
    Method m = underTest.getClass().getMethod("getBar");
    // no exception means the method is implememented
    // Do your mocking here
    doReturn( "BAR" ).when( underTest, "getBar" );
}catch(NoSuchMethodException e){}

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