api10：connectedAndroidTest + espresso：未找到测试

Question

我想通过命令行自动使用espresso。我已经编写了一些从android studio运行良好的测试，他们也可以使用模拟器api 16级和23级。在api 10级我收到此错误信息（仅通过gradle connectedAndroidTest运行）：

com.android.builder.testing.ConnectedDevice > No tests found.
[Nexus_4_API_10(AVD) - 2.3.7] [31mFAILED [0m
No tests found.
This usually means that your test classes are not in the form that your test runner expects
(e.g. don't inherit from TestCase or lack @Test annotations).
:app:connectedSourceDebugAndroidTest FAILED

（Source = flavor，Debug = build type）

我遵循了这个指南： https://developer.android.com/training/testing/ui-testing/espresso-testing.html

@RunWith(AndroidJUnit4.class)
public class LocaleTest{

@Rule
public ActivityTestRule<MainActivity> activityTestRule =
        new ActivityTestRule<>(MainActivity.class);

@Test
public void testSomethings(){
    //some code
}
}

我的build.gradle个依赖关系：

dependencies {
compile ('com.android.support:support-annotations:23.0.1')
androidTestCompile ('com.android.support.test:runner:0.5'){
    exclude group: 'com.android.support', module: 'support-annotations'
}
androidTestCompile ('com.android.support.test:rules:0.5'){
    exclude group: 'com.android.support', module: 'support-annotations'
}
androidTestCompile ('com.android.support.test.espresso:espresso-core:2.2.2'){
    exclude group: 'com.android.support', module: 'support-annotations'
}
compile 'com.android.support:appcompat-v7:23.0.1'
}

默认配置我添加了

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

先谢谢，我的想法已经不多了。

编辑（2016年6月27日）： LogCat输出

06-27 13:02:30.768 4485-4485/? D/dalvikvm: DexOpt: 'Ljunit/extensions/ActiveTestSuite$1;' has an earlier definition; blocking out
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