Issue 5610 - Deal with a '/' base path

test/DefaultFileSystem.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 <memory>
 #include <sstream>
 #include <AdblockPlus.h>
 #include <gtest/gtest.h>
 #include "../src/DefaultFileSystem.h"
 #include "BaseJsTest.h"
 
 using AdblockPlus::IFileSystem;
 using AdblockPlus::FileSystemPtr;
 using AdblockPlus::SchedulerTask;
 
@@ skipping 38 matching lines @@
       ASSERT_EQ(1u, fileSystemTasks.size());
       (*fileSystemTasks.begin())();
       fileSystemTasks.pop_front();
     }
 
     std::list<SchedulerTask> fileSystemTasks;
     FileSystemPtr fileSystem;
   };
 }
 
+#ifdef _WIN32
+#define SLASH_STRING "\\"
+#else
+#define SLASH_STRING "/"
+#endif
+
+TEST(DefaultFileSystemBasePathTest, BasePathAndResolveTest)
+{
+  class TestFSSync : public DefaultFileSystemSync
+  {
+  public:
+    explicit TestFSSync(const std::string& basePath)
+      : DefaultFileSystemSync(basePath)
+      {
+      }
+    const std::string& base() const
+      {
+        return basePath;
+      }
+  };
+
+  {
+    auto fs = std::unique_ptr<TestFSSync>(new TestFSSync(""));
+    EXPECT_EQ("", fs->base());
+    std::string fullPath = fs->Resolve("bar" SLASH_STRING "baz.txt");
+    EXPECT_EQ("bar" SLASH_STRING "baz.txt", fullPath);
+  }
+  {
+    auto fs = std::unique_ptr<TestFSSync>(new TestFSSync(SLASH_STRING));
+    EXPECT_EQ(SLASH_STRING, fs->base());
+    std::string fullPath = fs->Resolve("bar" SLASH_STRING "baz.txt");
+    EXPECT_EQ(SLASH_STRING "bar" SLASH_STRING "baz.txt", fullPath);
+  }
+  {
+    auto fs = std::unique_ptr<TestFSSync>(
+      new TestFSSync(SLASH_STRING "foo" SLASH_STRING));
+    EXPECT_EQ(SLASH_STRING "foo", fs->base());
+    std::string fullPath = fs->Resolve("bar" SLASH_STRING "baz.txt");
+    EXPECT_EQ(SLASH_STRING "foo" SLASH_STRING "bar" SLASH_STRING "baz.txt",
+              fullPath);
+  }
+  {
+    auto fs = std::unique_ptr<TestFSSync>(
+      new TestFSSync(SLASH_STRING "foo"));
+    EXPECT_EQ(SLASH_STRING "foo", fs->base());
+    std::string fullPath = fs->Resolve("bar" SLASH_STRING "baz.txt");
+    EXPECT_EQ(SLASH_STRING "foo" SLASH_STRING "bar" SLASH_STRING "baz.txt",
+              fullPath);
+  }
+}
+
 TEST_F(DefaultFileSystemTest, WriteReadRemove)
 {
   WriteString("foo");
 
   bool hasReadRun = false;
   fileSystem->Read(testFileName,
     [this, &hasReadRun](IFileSystem::IOBuffer&& content, const std::string& error)
   {
     EXPECT_TRUE(error.empty());
     EXPECT_EQ("foo", std::string(content.cbegin(), content.cend()));
@@ skipping 94 matching lines @@
   fileSystem->Stat(newTestFileName, [&hasStatRemovedFileRun](const IFileSystem::StatResult& result, const std::string& error)
   {
     EXPECT_TRUE(error.empty());
     ASSERT_FALSE(result.exists);
     hasStatRemovedFileRun = true;
   });
   EXPECT_FALSE(hasStatRemovedFileRun);
   PumpTask();
   EXPECT_TRUE(hasStatRemovedFileRun);
 }