单元测试升压文件系统create_directories

Question

我想单元测试boost文件系统函数create_directories（）的失败情况，即当create_directory失败时。有人可以提供任何建议如何做到这一点？另一个要求是代码需要跨平台。

Answer 1

你可以尝试创建一个路径的目录到文件：

#include <fstream> 
#include <iostream> 
#include "boost/filesystem/path.hpp" 
#include "boost/filesystem/operations.hpp" 

namespace bfs = boost::filesystem; 

int main() { 
    // Create test dir 
    boost::system::error_code ec; 
    bfs::path test_root(bfs::unique_path(
     bfs::temp_directory_path(ec)/"%%%%-%%%%-%%%%")); 
    if (!bfs::create_directory(test_root, ec) || ec) { 
    std::cout << "Failed creating " << test_root << ": " << ec.message() << '\n'; 
    return -1; 
    } 

    // Create file in test dir 
    bfs::path test_file(test_root/"file"); 
    std::ofstream file_out(test_file.c_str()); 
    file_out.close(); 
    if (!bfs::exists(test_file, ec)) { 
    std::cout << "Failed creating " << test_file << ": " << ec.message() << '\n'; 
    return -2; 
    } 

    // Try to create directory in test_file - should fail 
    bfs::path invalid_dir(test_file/"dir"); 
    if (bfs::create_directory(invalid_dir, ec)) { 
    std::cout << "Succeeded creating invalid dir " << invalid_dir << '\n'; 
    return -3; 
    } 

    // Try to create nested directory in test_file - should fail 
    bfs::path nested_invalid_dir(invalid_dir/"nested_dir"); 
    if (bfs::create_directories(nested_invalid_dir, ec)) { 
    std::cout << "Succeeded creating nested invalid dir " << invalid_dir << '\n'; 
    return -4; 
    } 

    // Clean up 
    bfs::remove_all(test_root); 
    return 0; 
}