Improve error reporting in tests

#include <fmt/format.h>

#include <fmt/chrono.h>

#include <thread>

#include <chrono>

#include <string_view>

#include <fstream>

using namespace std::literals;

using namespace std::chrono_literals;

std::ostream&

operator<<(std::ostream& os, const cargo::error_code& ec) {

    os << ec.name();

    return os;

}

CATCH_REGISTER_ENUM(cargo::transfer_state, cargo::transfer_state::pending,

                    cargo::transfer_state::running,

                    cargo::transfer_state::completed,

                    cargo::transfer_state::failed);

struct scoped_file {

    explicit scoped_file(std::filesystem::path filepath)

        : m_filepath(std::move(filepath)) {}