Send test name to server

Merge from Widevine repo of http://go/wvgerrit/59700

This CL sets the environment variable MODEL_NAME to be the current
unit test.  When running on a test platform, this environment variable
is used in the license request as model_name.

test: unit tests.
bug: 38004627

Change-Id: I347c5cec35942d68285cc01615b976097f37d214

libwvdrmengine/cdm/core/test/test_base.cpp

@@ -7,11 +7,12 @@
 #include "test_base.h"
 
 #include <getopt.h>
-
 #include <openssl/aes.h>
 #include <openssl/bio.h>
 #include <openssl/cmac.h>
-#include <openssl/err.h>
+#include <stdlib.h>
+
+#include <sstream>
 
 #include "cdm_engine.h"
 #include "crypto_session.h"
@@ -204,9 +205,19 @@ void WvCdmTestBase::SetUp() {
   ::testing::Test::SetUp();
   Properties::set_provisioning_messages_are_binary(binary_provisioning_);
   Properties::Init();
+  // Log the current test name, to help with debugging when the log and stdout
+  // are not the same.
   const ::testing::TestInfo* const test_info =
       ::testing::UnitTest::GetInstance()->current_test_info();
   LOGD("Running test %s.%s", test_info->test_case_name(), test_info->name());
+  // Some test environments allow the model name of the device to be set
+  // dynamically using an environment variable.  The model name will show up in
+  // the license server logs as the part of the device idenfication as
+  // "model_name".
+  std::stringstream ss;
+  ss << test_info->test_case_name() << "." << test_info->name();
+  int overwrite = 1;  // Set value even if already set.
+  setenv("MODEL_NAME", ss.str().c_str(), overwrite);
   CryptoSession::SetCryptoSessionFactory(new TestCryptoSessionFactory());
   // TODO(fredgc): Add a test version of DeviceFiles.
 }