Update minijail tests with real mocks and packaging testing deps

src/platform/minijail/minijail_testrunner.cc

Index: src/platform/minijail/minijail_testrunner.cc
diff --git a/src/platform/minijail/minijail_testrunner.cc b/src/platform/minijail/minijail_testrunner.cc
index 7aa22c3477f72e399e8c8ee1302eeb6610aa6dec..e0e598bc28a3ea657ebcb907cf191b96743476d7 100644
--- a/src/platform/minijail/minijail_testrunner.cc
+++ b/src/platform/minijail/minijail_testrunner.cc
@@ -2,9 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
 int main(int argc, char **argv) {
   ::testing::InitGoogleTest(&argc, argv);
+  ::testing::GTEST_FLAG(throw_on_failure) = true;
+  ::testing::InitGoogleMock(&argc, argv);
   return RUN_ALL_TESTS();
 }