Common test main

Merge from Widevine repo of http://go/wvgerrit/56521

This CL adds a common main routine for integration tests.  It sets a
default test configuration for the provisioning and license server
urls and certificates, and allows the user to set them on the command
line.

Test: current unit tests still pass.
Bug: 72354901 Fix Generic Crypto tests.
Change-Id: I604a3d9e15d50da5041794624c4571c0dcb091f5

libwvdrmengine/cdm/core/test/test_base.h

@@ -10,18 +10,32 @@
 #include "config_test_env.h"
 #include "crypto_session.h"
 #include "metrics_collections.h"
+#include "string_conversions.h"
 
 namespace wvcdm {
 // This is the base class for Widevine CDM integration tests.  It's main use is
 // to configure OEMCrypto to use a test keybox.
 class WvCdmTestBase : public ::testing::Test {
  public:
-  WvCdmTestBase() {}
+  WvCdmTestBase() : config_(default_config_) {}
   virtual ~WvCdmTestBase() {}
   virtual void SetUp();
+  virtual std::string binary_key_id() const { return a2bs_hex(config_.key_id()); }
 
+  // Returns true if the test program should continue, if false, the caller
+  // should exit.  This should be called by main() to allow the user to pass in
+  // command line switches.
+  static bool Initialize(int argc, char **argv);
   // Install a test keybox, if appropriate.
   static void InstallTestRootOfTrust();
+
+  // The default test configuration.  This is influenced by command line
+  // arguments before any tests are created.
+  static ConfigTestEnv default_config_;
+
+  // Configuration for an individual test.  This is initialized to be the
+  // default configuration, but can be modified by the test itself.
+  ConfigTestEnv config_;
 };
 
 class TestCryptoSession  : public CryptoSession {