使用 PowerMock 和 Robolectric - 不兼容的类更改错误

2022-09-03 02:42:34

我试图使用PowerMockito来模拟Android Robolectric测试中的一些静态方法。我正在使用JUnit 4.8.2,Robolectric 2.2,Mockito 1.9.5和PowerMock 1.9.5,如这里所示。由于我必须使用RoboElectricTestRunner,我正在尝试使用PowerMockRule来引导PowerMock。然而,当PowerMock的测试运行时,我遇到了一个不幸的问题。java.lang.IncompatibleClassChangeError

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:323) at sun.instrument.InstrumentationImpl.loadClassAndCallAgentmain(InstrumentationImpl.java:348)

Caused by: java.lang.incompatibleClassChangeError: Implementing class at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

如果我把放在库之后,我得到:org.ow2.asmorg.powermock

java.lang.IncompatibleClassChangeError: class org.objectweb.asm.tree.ClassNode has interface org.objectweb.asm.ClassVisitor as super class at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) atjava.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method)

在每个单元测试中。

根据Maven depency的说法:tree Robolectric和PowerMock不共享任何依赖项。显然 org.powermock:powermock-module-javaagent 打包了一些 org/objectweb/asm 类,而 Robolectric 依赖于 org.ow2.asm:asm:jar:4.1 导致冲突。


@RunWith(RobolectricTestRunner.class)
@PrepareForTest(Helper.class)
@PowerMockIgnore({"com.sun.jmx.*", "javax.management.*"})
public class HelpFragTest {

    @Rule
    public PowerMockRule rule = new PowerMockRule();

    static {
        PowerMockAgent.initializeIfNeeded();
    }

    FragmentActivity fragmentActivity;
    FragmentManager fragmentManager;
    ActionBarManager actionBarManager;

    @Before
    public void setup(){
        actionBarManager = mock(ActionBarManager.class);
        LowesApplication.instance().setActionBarManager(actionBarManager);
        fragmentActivity = Robolectric.buildActivity(FragmentActivity.class).create().start().resume().get();
        fragmentManager = fragmentActivity.getSupportFragmentManager();
    }

    @Test
    public void testShow(){
        mockStatic(Helper.class);

        HelpFrag helpFrag = HelpFrag.newInstance();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        fragmentTransaction.add(helpFrag, null);
        fragmentTransaction.commit();

        assertTrue(helpFrag.isVisible());
    }
}

答案 1

我找到了一种将PowerMock与Robolectric结合使用的方法。

除了标准的PowerMock jars之外,还需要PowerMock Junit Rule。这里描述了如何抓住它。我使用了类加载版本,因为那个版本非常错误。这是与PowerMock 1.5.5和Robolectric 2.3一起使用的,我不能谈论旧版本。另请注意,不应包含Java代理,因为根据我的经验,它会导致问题。xstreamobjenesis

因此,如果您使用的是 maven,则应声明以下依赖项:

<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-junit4</artifactId>
    <version>${powermock.version}</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-junit4-rule</artifactId>
    <version>${powermock.version}</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-api-mockito</artifactId>
    <version>${powermock.version}</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-classloading-xstream</artifactId>
    <version>${powermock.version}</version>
    <scope>test</scope>
</dependency>

然后,您必须像这样设置测试类:

@RunWith(RobolectricTestRunner.class)
@PowerMockIgnore({ "org.mockito.*", "org.robolectric.*", "android.*" })
@PrepareForTest(Static.class)
public class MyTest {

    @Rule
    public PowerMockRule rule = new PowerMockRule();

    private MyActivity activity;

    @Before
    public void setup() {
        activity = Robolectric.buildActivity(MyActivity.class).create().get();
    }

    @Test
    public void test() throws Exception {
        PowerMockito.mockStatic(Static.class);
        Mockito.when(Static.getCurrentTime()).thenReturn(1);

        Assert.assertEquals(1, activity.getId());
    }
}

答案 2

推荐