Issue 6064 - Put C++ code into a configurable namespace

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"
 
+ABP_NS_USING
+
 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));
 
   DeleteRegExp(id);
   // RegExp has been delete: all is false
   EXPECT_FALSE(TestRegExp(id, u"abcd"_str));
   EXPECT_FALSE(TestRegExp(id, u"1234"_str));
 }