text: /*
   * Copyright (c) 2021, Itamar S. <itamar8910@gmail.com>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include <AK/LexicalPath.h>
  #include <LibCore/DirIterator.h>
  #include <LibCore/File.h>
  #include <LibCpp/Parser.h>
  #include <LibTest/TestCase.h>
  #include <fcntl.h>
  #include <stdio.h>
  #include <string.h>
  #include <unistd.h>
  
  constexpr char TESTS_ROOT_DIR[] = "/home/anon/cpp-tests/preprocessor";
  
  static String read_all(const String& path)
  {
      auto result = Core::File::open(path, Core::OpenMode::ReadOnly);
      VERIFY(!result.is_error());
      auto content = result.value()->read_all();
      return { reinterpret_cast<const char*>(content.data()), content.size() };
  }
  
  TEST_CASE(test_regression)
  {
      Core::DirIterator directory_iterator(TESTS_ROOT_DIR, Core::DirIterator::Flags::SkipDots);
  
      while (directory_iterator.has_next()) {
          auto file_path = directory_iterator.next_full_path();
  
          auto path = LexicalPath { file_path };
          if (!path.has_extension(".cpp"))
              continue;
  
          outln("Checking {}...", path.basename());
  
          auto ast_file_path = String::formatted("{}.txt", file_path.substring(0, file_path.length() - sizeof(".cpp") + 1));
  
          auto source = read_all(file_path);
          auto target = read_all(ast_file_path);
  
          StringView source_view(source);
          Cpp::Preprocessor preprocessor(file_path, source_view);
  
          auto target_lines = target.split_view('\n');
          auto tokens = preprocessor.process_and_lex();
  
          EXPECT_EQ(tokens.size(), target_lines.size());
          for (size_t i = 0; i < tokens.size(); ++i) {
              EXPECT_EQ(tokens[i].to_string(), target_lines[i]);
          }
      }
  }
  