c# - c# 中的单元测试，来自 .csv 文件的数据

Question

我的测试函数如下:

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Collections;

namespace ex4
{
    [TestClass]
    public class UnitTest1
    {

        public double result = 0.0;
        computation co = new computation();

        public void valuereq()
        {

            Stream myStream = null;


            var openFileDialog1 = new OpenFileDialog();
            openFileDialog1.InitialDirectory = @"C:\Users\Hassan Qamar\Desktop\share market research paper\experiment folder";

            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    if ((myStream = openFileDialog1.OpenFile()) != null)
                    {
                        using (myStream)
                        {
                            string path = openFileDialog1.FileName;
                            var readstream = new StreamReader(myStream);
                            readstream.Close();
                            string[] datatoprint = File.ReadAllLines(@path);

                            result = co.LaggedCorrelation(datatoprint);
                            Console.WriteLine(result);

                        }
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
                }
            }
      }




        [TestMethod]
        public void TestMethod1()
        {                  
           Assert.AreEqual(9.8,result,0.5);                  
        }

    }
}

我正在从 .csv 文件中提取值并将其传递给计算。预期结果应为 9.6 左右。但是在测试时它在 assert 函数中显示 0 。

计算类如下:

using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Collections;

namespace ex4
{
    public class computation
    {
        Form1 f = new Form1();
        public double output;

        public double LaggedCorrelation(string[] datatoprint)
        {
            List<double> laggedCorrelation = new List<double>();
            int cond = 0;

            double n = datatoprint.Length - 1;//removing header row
            double xsum = 0.0, ysum = 0.0, x = 0.0, y = 0.0, xy = 0.0, xsquare = 0.0, ysquare = 0.0;
            //  while (cond < 2)
            //  {
            //   double output = 0.0; 
            double numerator = 0.0, denominator = 0.0;


            foreach (var l in datatoprint.Skip(1))
            {
                string[] s = l.Split(',');
                x = Convert.ToDouble(s[cond]); y = Convert.ToDouble(s[cond +1]);
                xsum += x; ysum += y;
                xy += x * y;
                xsquare += x * x; ysquare += y * y;
            }

            cond++;

            numerator = (n * (xy)) - (xsum * ysum);
            denominator = (Math.Sqrt(n * xsquare - xsum * xsum)) * (Math.Sqrt(n * ysquare - ysum * ysum));
            output = numerator / denominator;
            laggedCorrelation.Add(output);



            return output;
        }
    }
}

计算函数给出了 2 个给定股票之间的滞后相关性。当我在没有测试的情况下工作时，我得到了测试函数中要求的值。输出保持为 0。

Answer 1

您没有在测试方法中调用 valuereq() 方法。所以它采用初始值，即您在顶部分配的 0 public double result = 0.0;

无论如何，试试这个

 [TestMethod]
    public void TestMethod1()
    {   
       valuereq(); 
       Assert.AreEqual(9.8,result,0.5);                  
    }

顺便说一句，您不必重写 TestClass 中的实际方法，您所要做的就是创建一个包含您的实际方法的实际类的对象，并在您的 TestMethod 中调用它。

编辑:Assert.AreEqual 方法应采用两个参数结果和您的预期结果，在您的情况下为 9.6。所以它必须是 Assert.AreEqual(9.6,result); 才能让你的单元测试通过。