使用PowerMock和Robolectric-IncompatibleClassChangeError

Question

我正在尝试使用PowerMockito来模拟Android Robolectric测试中的一些静态方法。我使用的是JUnit 4.8.2、Robolectric2.2、Mockito 1.9.5和PowerMock 1.9.5。由于我必须使用RoboElectricTestRunner，所以我尝试使用PowerMockRule来引导PowerMock。然而，当使用PowerMock运行测试时，不幸的是我得到了java.lang.IncompatibleClassChangeError。

@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());
    }
}

Answer 1

因此，如果您使用的是maven，那么应该声明这些依赖项：

<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>

那么您必须这样设置您的测试类：

@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());
    }
}