[2019BUAA软工]第0次代码作业

Visual Studio 单元测试的简单应用

写在前面

  笔者根据作业的介绍以及Visual Studio 2017 文档的相关说明，进行了Visual Studio 单元测试的简单应用。

Tips	Link
课程链接	2019春季计算机学院软件工程（罗杰）（北京航空航天大学）
实验作业链接	[2019BUAA软工助教]第0次代码作业
实验成果连接	GitHub
参考文献	Visual Studio 2017 文档

---

单元测试代码

  单元测试从以下三方面展开：

1. 四则运算正确性；
2. 四则运算组合后计算的正确性；
3. 要求范围内所有整数运算的正确性；

#include "stdafx.h"
#include "CppUnitTest.h"
#include "../Calculator/Calculator.h"

using namespace Microsoft::VisualStudio::CppUnitTestFramework;

namespace CalculatorUnitTest
{		
	TEST_CLASS(Test)
	{
	public:
		Calculator* calc;

		TEST_METHOD_INITIALIZE(initCal) 
		{
			calc = new Calculator();
		}

		TEST_METHOD_CLEANUP(CleanCal)
		{
			delete calc;
			calc = NULL;
		}

		/*
			简单测试
		*/

		TEST_METHOD(SimpleADD)
		{
			string ret = calc->Solve("11+22");
			Assert::AreEqual(ret, (string)"11+22=33");
		}

		TEST_METHOD(SimpleSUB)
		{
			string ret = calc->Solve("77-33");
			Assert::AreEqual(ret, (string)"77-33=44");
		}

		TEST_METHOD(SimpleMUL)
		{
			string ret = calc->Solve("55*66");
			Assert::AreEqual(ret, (string)"55*66=3630");
		}

		TEST_METHOD(SimpleDIV)
		{
			string ret = calc->Solve("99/33");
			Assert::AreEqual(ret, (string)"99/33=3");
		}

		/*
			组合测试
		*/

		TEST_METHOD(ADD_ADD)
		{
			string ret = calc->Solve("22+33+11");
			Assert::AreEqual(ret, (string)"22+33+11=66");
		}

		TEST_METHOD(ADD_SUB)
		{
			string ret = calc->Solve("22+33-11");
			Assert::AreEqual(ret, (string)"22+33-11=44");
		}

		TEST_METHOD(ADD_MUL)
		{
			string ret = calc->Solve("22+33*11");
			Assert::AreEqual(ret, (string)"22+33*11=385");
		}

		TEST_METHOD(ADD_DIV)
		{
			string ret = calc->Solve("22+33/11");
			Assert::AreEqual(ret, (string)"22+33/11=25");
		}

		TEST_METHOD(SUB_ADD)
		{
			string ret = calc->Solve("99-66+77");
			Assert::AreEqual(ret, (string)"99-66+77=110");
		}

		TEST_METHOD(SUB_SUB)
		{
			string ret = calc->Solve("99-22-55");
			Assert::AreEqual(ret, (string)"99-22-55=22");
		}

		TEST_METHOD(SUB_MUL)
		{
			string ret = calc->Solve("77-6*11");
			Assert::AreEqual(ret, (string)"77-6*11=11");
		}

		TEST_METHOD(SUB_DIV)
		{
			string ret = calc->Solve("77-88/2");
			Assert::AreEqual(ret, (string)"77-88/2=33");
		}

		TEST_METHOD(MUL_ADD)
		{
			string ret = calc->Solve("22*33+11");
			Assert::AreEqual(ret, (string)"22*33+11=737");
		}

		TEST_METHOD(MUL_SUB)
		{
			string ret = calc->Solve("22*33-11");
			Assert::AreEqual(ret, (string)"22*33-11=715");
		}

		TEST_METHOD(MUL_MUL)
		{
			string ret = calc->Solve("22*33*99");
			Assert::AreEqual(ret, (string)"22*33*99=71874");
		}

		TEST_METHOD(MUL_DIV)
		{
			string ret = calc->Solve("22*33/11");
			Assert::AreEqual(ret, (string)"22*33/11=66");
		}

		TEST_METHOD(DIV_ADD)
		{
			string ret = calc->Solve("99/9+11");
			Assert::AreEqual(ret, (string)"99/9+11=22");
		}

		TEST_METHOD(DIV_SUB)
		{
			string ret = calc->Solve("99/9-10");
			Assert::AreEqual(ret, (string)"99/9-10=1");
		}

		TEST_METHOD(DIV_MUL)
		{
			string ret = calc->Solve("99/9*22");
			Assert::AreEqual(ret, (string)"99/9*22=242");
		}

		TEST_METHOD(DIV_DIV)
		{
			string ret = calc->Solve("99/9/11");
			Assert::AreEqual(ret, (string)"99/9/11=1");
		}

		/*
			运算数长度
		*/
		TEST_METHOD(Length_1)
		{
			string ret = calc->Solve("9/3*2+8");
			Assert::AreEqual(ret, (string)"9/3*2+8=14");
		}

		TEST_METHOD(Length_2)
		{
			string ret = calc->Solve("90/3*22+8");
			Assert::AreEqual(ret, (string)"90/3*22+8=668");
		}

		TEST_METHOD(Length_3)
		{
			string ret = calc->Solve("90/30*2+89");
			Assert::AreEqual(ret, (string)"90/30*2+89=95");
		}
	};

}

---

Bug修复

  经过调试，对源程序的以下三个部分进行修复。

string Calculator::Solve(string formula) {
	vector<string>* tempStack = new vector<string>();
	stack<char>* operatorStack = new stack<char>();
	int len = formula.length();
	int k = 0;
	for (int j = -1; j < len - 1; j++) {
		char formulaChar = formula[j + 1];
		if (j == len - 2 || formulaChar == '+' || formulaChar == '-' ||
			formulaChar == '*' || formulaChar == '/') {
			if (j == len - 2) {
				tempStack->push_back(formula.substr(k));
			}
			else {
				if (k <= j) {	// 判断条件错误：k < j ===> k <= j
					/*
						substr 使用错误:
						tempStack->push_back(formula.substr(k, j + 1));
					*/
					/*----------修改后----------*/
					tempStack->push_back(formula.substr(k, j - k + 1)); 
					/*--------------------------*/
				}
				if (operatorStack->empty()) {
					operatorStack->push(formulaChar);
				}
				else {
					char stackChar = operatorStack->top();
					if ((stackChar == '+' || stackChar == '-')
						&& (formulaChar == '*' || formulaChar == '/')) {
						operatorStack->push(formulaChar);
					}
					else {
						/*
							to_string 使用错误:
							tempStack->push_back(to_string(operatorStack->top()));	
						*/
						/*----------修改后----------*/
						string tempOp(1, operatorStack->top());
						tempStack->push_back(tempOp);
						/*--------------------------*/
						operatorStack->pop();
						operatorStack->push(formulaChar);
					}
				}
			}
			k = j + 2;
		}
	}
// 以下略。

• 错误一导致一位数计算时无法将字符串中的数字截取插入临时栈(tempStack)。
• 错误二导致截取数字时截取到错误的长度的子串。
• 错误三会将运算符转换为相应的ASCII码，导致插入临时栈的为数字字符串而非运算符字符串。