Added test for empty files

tests/fineftp_test/src/fineftp_stresstest.cpp

@@ -101,6 +101,85 @@ TEST(FineFTPTest, SimpleUploadDownload) {
 }
 #endif
 
+#if 1
+TEST(FineFTPTest, EmptyFile)
+{
+  const auto test_working_dir = std::filesystem::current_path();
+  const auto ftp_root_dir     = test_working_dir / "ftp_root";
+  const auto local_root_dir   = test_working_dir / "local_root";
+
+  if (std::filesystem::exists(ftp_root_dir))
+    std::filesystem::remove_all(ftp_root_dir);
+
+  if (std::filesystem::exists(local_root_dir))
+    std::filesystem::remove_all(local_root_dir);
+
+  // Make sure that we start clean, so no old dir exists
+  ASSERT_FALSE(std::filesystem::exists(ftp_root_dir));
+  ASSERT_FALSE(std::filesystem::exists(local_root_dir));
+
+  std::filesystem::create_directory(ftp_root_dir);
+  std::filesystem::create_directory(local_root_dir);
+
+  // Make sure that we were able to create the dir
+  ASSERT_TRUE(std::filesystem::is_directory(ftp_root_dir));
+  ASSERT_TRUE(std::filesystem::is_directory(local_root_dir));
+
+  fineftp::FtpServer server(2121);
+  server.start(1);
+
+  server.addUserAnonymous(ftp_root_dir.string(), fineftp::Permission::All);
+
+  // Create an empty file in the local root dir
+  auto local_file = local_root_dir / "empty_file.txt";
+  std::ofstream ofs(local_file.string());
+  ofs.close();
+
+  // Make sure that the file exists
+  ASSERT_TRUE(std::filesystem::exists(local_file));
+  ASSERT_TRUE(std::filesystem::is_regular_file(local_file));
+
+  // Upload the file to the FTP server using curl
+  {
+    const std::string curl_command = "curl -S -s -T \"" + local_file.string() + "\" \"ftp://localhost:2121/\"";
+    const auto curl_result = std::system(curl_command.c_str());
+
+    // Make sure that the upload was successful
+    ASSERT_EQ(curl_result, 0);
+
+    // Make sure that the file exists in the FTP root dir
+    auto ftp_file = ftp_root_dir / "empty_file.txt";
+    ASSERT_TRUE(std::filesystem::exists(ftp_file));
+    ASSERT_TRUE(std::filesystem::is_regular_file(ftp_file));
+
+    // Make sure that the file is empty
+    std::ifstream ifs(ftp_file.string());
+    const std::string content((std::istreambuf_iterator<char>(ifs)), (std::istreambuf_iterator<char>()));
+    ASSERT_TRUE(content.empty());
+  }
+
+  // Download the file again
+  {
+    const std::string curl_command_download = "curl -S -s -o \"" + local_root_dir.string() + "/empty_file_download.txt\" \"ftp://localhost:2121/empty_file.txt\"";
+    const auto curl_result = std::system(curl_command_download.c_str());
+    ASSERT_EQ(curl_result, 0);
+
+    // Make sure that the files are identical
+    auto local_file_download = local_root_dir / "empty_file_download.txt";
+
+    ASSERT_TRUE(std::filesystem::exists(local_file_download));
+    ASSERT_TRUE(std::filesystem::is_regular_file(local_file_download));
+
+    std::ifstream ifs(local_file_download.string());
+    const std::string content((std::istreambuf_iterator<char>(ifs)), (std::istreambuf_iterator<char>()));
+    ASSERT_TRUE(content.empty());
+  }
+
+
+  // Stop the server
+}
+#endif
+
 #if 1
 TEST(FineFTPTest, BigFilesMultipleClients)
 {