CTS测试 com.android.cts.appsecurity.AppSecurityTests -- testPermissionDiffCert

Compatibility Test Package: android.tests.appsecurity ABI: armeabi-v7a 
Test Result Details 
com.android.cts.appsecurity.AppSecurityTests 
-- testPermissionDiffCert fail java.lang.AssertionError: on-device tests failed: com.android.cts.usespermissiondiffcertapp.ModifyInstallerPackageTest#testSetInstallPackage: 问题1：为啥device-logcat 没有运行testSetInstallPackage 这个方法啊？
问题2： 这项测试的是什么啊？
问题3：这项fail掉是因为有个客户定制的apk，移除后就可以通过，但这个apk不能移除，有什么其他方法吗？
问题4： 安卓系统源码里，cts 包内的代码能修改吗？
com.android.cts.usespermissiondiffcertapp.ModifyInstallerPackageTest#testSetInstallPackageConflictingInstaller:
junit.framework.ComparisonFailure: expected:<null> but was:<com.aptoide.partners.qmobile_store>
at junit.framework.Assert.assertEquals(Assert.java:85)
at junit.framework.Assert.assertEquals(Assert.java:91)
at com.android.cts.usespermissiondiffcertapp.ModifyInstallerPackageTest.testSetInstallPackageConflictingInstaller(ModifyInstallerPackageTest.java:181)
at java.lang.reflect.Method.invoke(Native Method)
at junit.framework.TestCase.runTest(TestCase.java:185)
at junit.framework.TestCase.runBare(TestCase.java:151)
at junit.framework.TestResult$1.protect(TestResult.java:115)
at android.support.test.internal.runner.junit3.AndroidTestResult.runProtected(AndroidTestResult.java:77)
at junit.framework.TestResult.run(TestResult.java:118)
at android.support.test.internal.runner.junit3.AndroidTestResult.run(AndroidTestResult.java:55)
at junit.framework.TestCase.run(TestCase.java:126)
at android.support.test.internal.runner.junit3.NonLeakyTestSuite$NonLeakyTest.run(NonLeakyTestSuite.java:63)
at junit.framework.TestSuite.runTest(TestSuite.java:243)
at junit.framework.TestSuite.run(TestSuite.java:238)
at android.support.test.internal.runner.junit3.DelegatingTestSuite.run(DelegatingTestSuite.java:103)
at android.support.test.internal.runner.junit3.AndroidTestSuite.run(AndroidTestSuite.java:69)
at android.support.test.internal.runner.junit3.JUnit38ClassRunner.run(JUnit38ClassRunner.java:90)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:24)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at org.junit.runner.JUnitCore.run(JUnitCore.java:136)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:54)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:228)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1882)
com.android.cts.usespermissiondiffcertapp.ModifyInstallerPackageTest#testSetInstallPackageWrongCertificate:
junit.framework.ComparisonFailure: expected:<null> but was:<com.aptoide.partners.qmobile_store>
at junit.framework.Assert.assertEquals(Assert.java:85)
at junit.framework.Assert.assertEquals(Assert.java:91)
at com.android.cts.usespermissiondiffcertapp.ModifyInstallerPackageTest.testSetInstallPackageWrongCertificate(ModifyInstallerPackageTest.java:163)
at java.lang.reflect.Method.invoke(Native Method)
at junit.framework.TestCase.runTest(TestCase.java:185)
at junit.framework.TestCase.runBare(TestCase.java:151)
at junit.framework.TestResult$1.protect(TestResult.java:115)
at android.support.test.internal.runner.junit3.AndroidTestResult.runProtected(AndroidTestResult.java:77)
at junit.framework.TestResult.run(TestResult.java:118)
at android.support.test.internal.runner.junit3.AndroidTestResult.run(AndroidTestResult.java:55)
at junit.framework.TestCase.run(TestCase.java:126)
at android.support.test.internal.runner.junit3.NonLeakyTestSuite$NonLeakyTest.run(NonLeakyTestSuite.java:63)
at junit.framework.TestSuite.runTest(TestSuite.java:243)
at junit.framework.TestSuite.run(TestSuite.java:238)
at android.support.test.internal.runner.junit3.DelegatingTestSuite.run(DelegatingTestSuite.java:103)
at android.support.test.internal.runner.junit3.AndroidTestSuite.run(AndroidTestSuite.java:69)
at android.support.test.internal.runner.junit3.JUnit38ClassRunner.run(JUnit38ClassRunner.java:90)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:24)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at org.junit.runner.JUnitCore.run(JUnitCore.java:136)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:54)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:228)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1882) at com.android.cts.appsecurity.Utils.runDeviceTests(Utils.java:100)
at com.android.cts.appsecurity.Utils.runDeviceTests(Utils.java:38)
at com.android.cts.appsecurity.AppSecurityTests.runDeviceTests(AppSecurityTests.java:291)
at com.android.cts.appsecurity.AppSecurityTests.testPermissionDiffCert(AppSecurityTests.java:282)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
at com.android.tradefed.testtype.DeviceTestResult$1.protect(DeviceTestResult.java:81)
at com.android.tradefed.testtype.DeviceTestResult.runProtected(DeviceTestResult.java:56)
at com.android.tradefed.testtype.DeviceTestResult.run(DeviceTestResult.java:85)
at junit.framework.TestCase.run(TestCase.java:124)
at com.android.tradefed.testtype.DeviceTestCase.run(DeviceTestCase.java:117)
at com.android.cts.tradefed.testtype.JarHostTest$TestRunnable.run(JarHostTest.java:248)
at com.android.tradefed.util.RunUtil$RunnableNotifier.run(RunUtil.java:378)10-20 12:25:56 W/BatteryFetcher: IOException getting battery level for device 56810110923659: Unrecognized response to battery level queries
10-20 12:25:56 D/RunUtil: run interrupt allowed: false