逻辑覆盖法是设计白盒测试用例的主要方法之一,通过对程序逻辑结构的遍历实现程序的覆

题库2022-08-02  49

问题 逻辑覆盖法是设计白盒测试用例的主要方法之一,通过对程序逻辑结构的遍历实现程序的覆盖。针对以下由C语言编写的程序,按要求回答问题。int XOR(char * filename,unsigned long key){    FILE * input = NULL , *output =NULL;   //i    char * outfilename = NULL;    int len = strlen(filename);    unsigned char buffer;    if( (filename[len-2] == '.')&& (filename[len-1] == 'c') ) { //2,3    outfilename = new char[len+1];  //4    strcpy(outfilename, filename);    outfilename[len-2] = '\0';    }    else{   //5    outfilename = new char[len+5];    strcpy(outfilename, filename);    strncat(outfilename,".c",2);    }    input =fopen(filename,"rb");    if( input == NULL) {   //6    cout << "Error opening file " << filename << endl;  //7    delete [] outfilename;    outfilename = NULL;    return 1;    }    output =fopen(outfilename,"wb");    if( output == NULL ) {   //8    cout << "Error creating output file " << outfilename << endl;  //9    delete [] outfilename;    outfilename = NULL;    return 1;    }    while( ! feof(input) ) {  //10    if(fread(&buffer,sizeof(unsigned char),1,input) != 1 ) {   //11    if( ! feof(input) ) {   //12    delete [] outfilename;  //13    outfilename = NULL;    fclose(input);    fclose(output);    return 1;    }    }    else{   //14    buffer ^= key;    fwrite(&buffer,sizeof(unsigned char),1,output);    }    }    fclose(input);   //15    fclose(output);    delete [] outfilename;    return 0;    }请给出满足100%DC(判定覆盖)所需的逻辑条件。

选项

答案

解析 本题考查白盒测试技术的应用。1.本问题考查白盒测试用例设计方法:判定覆盖法。判定覆盖指设计足够的测试用例,使得被测程序中每个判定表达式至少获得一次"真"值和"假"值,从而使程序的每一个分支至少都通过一次。本题中程序有6个判定,所以满足判定覆盖一共需要12个逻辑条件。
转载请注明原文地址:https://tihaiku.com/congyezige/2416156.html

最新回复(0)