com.google.android.gts.placement.CoreGmsAppsTest#testCoreGmsAppsPreloaded fail

GTS 4.0运行时会报如下错误：

com.google.android.gts.placement.CoreGmsAppsTest#testCoreGmsAppsPreloaded fail junit.framework.AssertionFailedError: Mandatory core GMS packages not found as system apps:

从报错信息看出系统未检测到Hangout导致测试fail.但这是Google要求,将强制预置App Hangout更换为Duo，所以可以去申请waive

具体分析如下:

testCoreGmsAppsPreloaded case test preloaded mandatory core app list,

but Duo app has replaced hangouts app from GMS gms-oem-mnc-6.0.1-signed-r10-20161111 and gms-oem-N-7.0-signed-r4-20161111 version on Telephony devices, so case do not find com.google.android.talk app：

com.google.android.gts.placement.CoreGmsAppsTest#testCoreGmsAppsPreloaded fail: junit.framework.AssertionFailedError: Mandatory core GMS packages not found as system apps:

com.google.android.talk

at junit.framework.Assert.fail(Assert.java:50)

at junit.framework.Assert.assertTrue(Assert.java:20)

at

com.google.android.gts.placement.CoreGmsAppsTest.checkGeneralCoreGmsAppsPreloaded(CoreGmsAppsTest.java:175)

at com.google.android.gts.placement.CoreGmsAppsTest.testCoreGmsAppsPreloaded(CoreGmsAppsTest.java:228)

at java.lang.reflect.Method.invoke(Native Method)

at junit.framework.TestCase.runTest(TestCase.java:168)

at junit.framework.TestCase.runBare(TestCase.java:134)

at junit.framework.TestResult$1.protect(TestResult.java:115)

at android.support.test.internal.runner.junit3.AndroidTestResult.runProtected(AndroidTestResult.java:77)

at junit.framework.TestResult.run(TestResult.java:118)

at android.support.test.internal.runner.junit3.AndroidTestResult.run(AndroidTestResult.java:55)

at junit.framework.TestCase.run(TestCase.java:124)

at android.support.test.internal.runner.junit3.NonLeakyTestSuite$NonLeakyTest.run(NonLeakyTestSuite.java:63)

at android.support.test.internal.runner.junit3.AndroidTestSuite$1.run(AndroidTestSuite.java:97)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)

at java.util.concurrent.FutureTask.run(FutureTask.java:237)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)

at java.lang.Thread.run(Thread.java:761)