版权声明：本文为博主原创文章，转载请务必注明作者与原文链接。 https://blog.csdn.net/jingerppp/article/details/81565909
来源：
https://blog.csdn.net/shift_wwx/article/details/81565909
GTS 在测试case armeabi-v7a GtsAppBlacklistDeviceTestCases 的时候出现下面异常，本文总结一下。
com.google.android.appblacklist.gts.GtsAppBlacklistDeviceTest#testForBlacklistedApps
测试的host log 如下：
junit.framework.AssertionFailedError: Packages with a blacklisted signature:
com.android.providers.telephony
com.android.providers.media
com.android.wallpapercropper
com.android.documentsui
...
...
com.android.certinstaller
android
com.android.contacts
...
...
com.android.phone
at junit.framework.Assert.fail(Assert.java:50)
at junit.framework.Assert.assertTrue(Assert.java:20)
at com.google.android.appblacklist.gts.GtsAppBlacklistDeviceTest.checkContainsBlacklistedCerts(GtsAppBlacklistDeviceTest.java:153)
at com.google.android.appblacklist.gts.GtsAppBlacklistDeviceTest.testForBlacklistedApps(GtsAppBlacklistDeviceTest.java:212)
at java.lang.reflect.Method.invoke(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:220)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:205)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:115)
at android.support.test.internal.runner.junit3.AndroidTestResult.runProtected(AndroidTestResult.java:73)
at junit.framework.TestResult.run(TestResult.java:118)
at android.support.test.internal.runner.junit3.AndroidTestResult.run(AndroidTestResult.java:51)
at junit.framework.TestCase.run(TestCase.java:124)
at android.support.test.internal.runner.junit3.NonLeakyTestSuite$NonLeakyTest.run(NonLeakyTestSuite.java:62)
at android.support.test.internal.runner.junit3.AndroidTestSuite$2.run(AndroidTestSuite.java:101)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:457)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)会列出很多的包不满足要求，从log 看应该是这些包都属于黑名单中的一员。
来看下GTS 的source code：
public void testForBlacklistedApps() throws IOException, XmlPullParserException, NameNotFoundException {
List<PackageInfo> packageInfos = getAllPackages();
DynamicConfigDeviceSide dcds = new DynamicConfigDeviceSide(MODULE_NAME);
checkContainsBlacklistedCerts(packageInfos, dcds.getValues("cert_digests"));
checkContainsBlacklistedPackageNames(packageInfos, dcds.getValues("package_names"));
checkContainsBlacklistedAppDigests(packageInfos, dcds.getValues("app_digests"));
}本文不去详细解释code，大概梳理一下：
1、DynamicConfigDeviceSide 为了解析GTS 中一些配置文件，一般都是以dynamic 结尾的文件，例如：
<dynamicConfig>
<entry key="package_names">
<value>com.android.tools.callassistant</value>
<value>com.android.tools.hfmsrv</value>
<value>com.android.tools.srv</value>
</entry>
<entry key="app_digests">
<value>28f04c37f5c8f91e015328cf55dec5a3be053ca41f1dd98f4cb3a857bebd172f</value>
</entry>
<entry key="cert_digests">
<value>c891f9eb64179e0c8919dd79f230770a5c2dc1dbcada4747f7b82c54b842a9ec</value>
</entry>
</dynamicConfig>2、从log看，这里应该是checkContainsBlacklistedCerts() 出了fail
private void checkContainsBlacklistedCerts(List<PackageInfo> packageInfos, List<String> blacklistedCerts) throws IOException, XmlPullParserException, NameNotFoundException {
if (!blacklistedCerts.isEmpty()) {
List<String> blacklistedInstalledPackages = new ArrayList();
for (PackageInfo packageInfo : packageInfos) {
String packageName = packageInfo.packageName;
if (blacklistedCerts.contains(computePackageCertDigest(packageInfo.signatures[0]))) {
blacklistedInstalledPackages.add(packageName);
}
}
assertTrue(String.format("Packages with a blacklisted signature:\n%s", new Object[]{TextUtils.join("\n", blacklistedInstalledPackages)}), blacklistedInstalledPackages.isEmpty());
}
}code 比较清晰，每个package 中的signature 经过compute 之后，确认是否是dynamic 文件中规定的属于黑名单，如果是，那就会assert失败。
结论：
这个case 是因为package 的签名是默认签名，也就是dynamic 里面规定的 cert_digests 的value，导致了assert fail。
GTS 要求系统必须要签名，但key 不能是Default key。
更多GTS 测试的case 见：