Issue 5183 - Provide async interface for FileSystem

test/Prefs.cpp

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 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
@@ skipping 122 matching lines @@
     ResetJsEngine();
     auto filterEngine = CreateFilterEngine();
     ASSERT_EQ("filters.ini", filterEngine->GetPref("patternsfile").AsString());
     ASSERT_EQ(48, filterEngine->GetPref("patternsbackupinterval").AsInt());
     ASSERT_FALSE(filterEngine->GetPref("subscriptions_autoupdate").AsBool());
   }
 }
 
 TEST_F(PrefsTest, UnknownPrefs)
 {
-  using IOBuffer = AdblockPlus::FileSystem::IOBuffer;
+  using IOBuffer = AdblockPlus::IFileSystem::IOBuffer;
   std::string content = "{\"foobar\":2, \"patternsbackupinterval\": 12}";
   fileSystem->prefsContents = IOBuffer(content.cbegin(), content.cend());
   auto filterEngine = CreateFilterEngine();
   ASSERT_TRUE(filterEngine->GetPref("foobar").IsUndefined());
   ASSERT_EQ(12, filterEngine->GetPref("patternsbackupinterval").AsInt());
 }
 
 TEST_F(PrefsTest, SyntaxFailure)
 {
-  using IOBuffer = AdblockPlus::FileSystem::IOBuffer;
+  using IOBuffer = AdblockPlus::IFileSystem::IOBuffer;
   std::string content = "{\"patternsbackupinterval\": 6, \"foo\"}";
   fileSystem->prefsContents = IOBuffer(content.cbegin(), content.cend());
   auto filterEngine = CreateFilterEngine();
 
   ASSERT_EQ(24, filterEngine->GetPref("patternsbackupinterval").AsInt());
 }
 
 TEST_F(PrefsTest, PreconfiguredPrefsPreconfigured)
 {
   AdblockPlus::FilterEngine::Prefs preconfiguredPrefs;
@@ skipping 45 matching lines @@
   {
     ResetJsEngine();
     AdblockPlus::FilterEngine::Prefs preconfiguredPrefs;
     preconfiguredPrefs.emplace("suppress_first_run_page", jsEngine->NewValue(true));
     auto filterEngine = CreateFilterEngine(preconfiguredPrefs);
 
     ASSERT_TRUE(filterEngine->GetPref("suppress_first_run_page").IsBool());
     ASSERT_FALSE(filterEngine->GetPref("suppress_first_run_page").AsBool());
   }
 }