执行Robolectric JUnit 4测试用例时出现初始化错误

我在执行Robolectric JUnit 4测试用例时面临初始化错误。
开发IDE：Eclipse Indigo 3.7.2

java.lang.NoClassDefFoundError: org/robolectric/annotation/Config

请在下面找到我的测试用例的源代码：

@RunWith(RobolectricTestRunner.class)
public class MainActivityTest {

    @Test
    public void clickingSplashVideo_shouldStartCategoryActivity() throws Exception {

        MainActivity activity = Robolectric.setupActivity(MainActivity.class);
        activity.findViewById(R.id.myvideoview).performClick();

        String hello = activity.getString(R.string.app_name);
        assertThat(hello, CoreMatchers.equalTo("Hello world!"));

        Intent expectedIntent = new Intent(activity, CategoryActivity.class);
        assertThat(Shadows.shadowOf(activity).getNextStartedActivity(), CoreMatchers.equalTo(expectedIntent));
    }
}