New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

tools/poly_borders/poly_borders_tests/tools.cpp

@@ -0,0 +1,47 @@
+#include "poly_borders/poly_borders_tests/tools.hpp"
+
+#include "poly_borders/borders_data.hpp"
+
+#include "generator/borders.hpp"
+
+#include "geometry/region2d.hpp"
+
+#include "base/file_name_utils.hpp"
+
+#include <string>
+#include <vector>
+
+using namespace platform::tests_support;
+
+namespace
+{
+std::vector<m2::RegionD> ConvertFromPointsVector(
+    std::vector<std::vector<m2::PointD>> const & polygons)
+{
+  std::vector<m2::RegionD> res;
+  res.reserve(polygons.size());
+  for (auto const & polygon : polygons)
+    res.emplace_back(polygon);
+
+  return res;
+}
+}  // namespace
+
+namespace poly_borders
+{
+std::shared_ptr<ScopedFile> CreatePolyBorderFileByPolygon(
+    std::string const & relativeDirPath, std::string const & name,
+    std::vector<std::vector<m2::PointD>> const & polygons)
+{
+  std::string path = base::JoinPath(relativeDirPath, name + BordersData::kBorderExtension);
+
+  auto file = std::make_shared<ScopedFile>(path, ScopedFile::Mode::Create);
+
+  auto const targetDir = base::GetDirectory(file->GetFullPath());
+
+  auto const regions = ConvertFromPointsVector(polygons);
+  borders::DumpBorderToPolyFile(targetDir, name, regions);
+
+  return file;
+}
+}  // namespace poly_borders