Java语言lang.NoClassDefFoundError:组织/机器人分子/内部/阴影提取器

使用

testImplementation 'org.robolectric:shadows-play-services:3.4-rc2'
testImplementation "org.robolectric:robolectric:3.6.1"
testImplementation "com.google.android.gms:play-services-auth:$rootProject.ext.googlePlayServicesVersion" // the robolectric shadow bogusly needs this

我正在尝试:

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;

import org.junit.Before;
import org.junit.runner.RunWith;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.annotation.Config;
import org.robolectric.shadows.gms.Shadows;
import org.robolectric.shadows.gms.common.ShadowGoogleApiAvailability;

@RunWith(RobolectricTestRunner.class)
@Config(manifest = Config.NONE, shadows = {ShadowGoogleApiAvailability.class})
public abstract class BaseTest {
        @Before
        public void setUp() {
                final ShadowGoogleApiAvailability shadowGoogleApiAvailability
                        = Shadows.shadowOf(GoogleApiAvailability.getInstance());
                final int expectedCode = ConnectionResult.SUCCESS;
                shadowGoogleApiAvailability.setIsGooglePlayServicesAvailable(expectedCode);
        }
}

然而,我的测试失败了,出现了一个奇怪的错误:

java.lang.NoClassDefFoundError: org/robolectric/internal/ShadowExtractor
    at org.robolectric.shadows.gms.Shadows.shadowOf(Shadows.java:37)
    at ......BaseTest.setUp(BaseTest.java:19)

我做错了什么,如何修复?