Issue 6221 - Add native tests.

test/compiled/RegExp.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "gtest/gtest.h"
 #include "compiled/String.h"
 
 TEST(TestRegexp, RegExp)
 {
   auto id = GenerateRegExp(u"[0-9]*"_str, false);
   EXPECT_EQ(id, 0);
   EXPECT_FALSE(TestRegExp(id, u"abcd"_str));
   EXPECT_TRUE(TestRegExp(id, u"1234"_str));

[sergei, 2018/01/29 13:38:44]

I think, formally we should delete the regular expression at the end.

[hub, 2018/01/29 16:57:46]

Done.

+
+  DeleteRegExp(id);
+  // RegExp has been delete: all is false
+  EXPECT_FALSE(TestRegExp(id, u"abcd"_str));

[sergei, 2018/01/30 13:05:37]

I'm not sure that it should work this way, but OK, I guess it will be changes
later anyway.

+  EXPECT_FALSE(TestRegExp(id, u"1234"_str));
 }