如何在Firebase测试实验室中执行指定的测试套件类

我有一个像这样的浓缩咖啡测试套件课程

package instrumentedtest;

import org.junit.ClassRule;
import org.junit.rules.ExternalResource;
import org.junit.runner.RunWith;
import org.junit.runners.Suite;

@RunWith(Suite.class)
@Suite.SuiteClasses({
        Test1.class,
        Test2.class,
        Test3.class
})

public class POSRuleSuite {
    @ClassRule
    public static ExternalResource testRule = new ExternalResource() {
        @Override
        protected void before() throws Throwable {
            System.out.println("Testing starts.........");
        }

        @Override
        protected void after() {
            System.out.println("Testing ends.........");
        }
    };
}

我在Android Studio中使用这个套件类设置了Firebase测试。我从Android Studio启动了这个firebase测试,它确实有效。

但是当我用Gcloud命令从命令行启动它时,我没有执行测试。

gcloud firebase test android run ^
    --type instrumentation ^
    --app POS.apk ^
    --test POS-debug-androidTest.apk ^
    --test-runner-class=org.junit.runners.Suite ^
    --test-targets=instrumentedtest.POSRuleSuite ^
    --device model=Nexus10,version=22,locale=en,orientation=landscape ^
    --timeout 300s

Uploading [POS.apk] to Firebase Test Lab...
Uploading [POS-debug-androidTest.apk] to Firebase Test Lab...
Raw results will be stored in your GCS bucket at [https://console.developers.google.com/storage/browser/test-lab-j9zwyqscmy0rw-k53tazzivjxvu/2017-10-19_14:25:20.055000_jPmA/]

ERROR: (gcloud.firebase.test.android.run) Http error while creating test matrix: ResponseError 400: Invalid test target for instrumentation test: instrumentedtest.POSRuleSuite

C:\git\POS>

有人知道如何让它工作吗?

感谢您的帮助。