Question

您好，我想知道如何对以下方法进行单元测试：

 public float calcNP()
    {

        int rowcount = dataGridView1.Rows.Count;

        int[] colB = new int[rowcount];
        float[] NP = new float[rowcount];
        float avgNP = 0;
        for (int i = 0; i < rowcount; i++)
        {
            colB[i] = Convert.ToInt32(dataGridView1.Rows[i].Cells[5].Value);


        }

        float min = colB.Min();
        float max = colB.Max();
        float a = 1, b = 10;

        for (int i = 0; i < rowcount; i++)
        {
            NP[i] = (a + (colB[i] - min) * (b - a)) / (max - min);
            avgNP = NP[i] + avgNP;



        }

        avgNP = (avgNP / rowcount) * 100;
        return avgNP;
    }

以及以下

  public float calcIFact()
    {

        float ftp = calcFTP();
        float NP = calcNP();
        float IntFact = NP / ftp;

        return IntFact;


    }

和这个

public float calcFTP()
    {

        float ftp = 0;

        if (chkFTP.Checked == true)
        {
            //  ftp =(float)Convert.ToDouble(txtFTP.Text)/100;
            ftp = (float)Convert.ToDouble(txtFTP.Text);

        }

        if (chkFTP.Checked == false)
        {
            int rowcount = dataGridView1.Rows.Count;

            int[] colB = new int[rowcount];


            for (int i = 0; i < rowcount; i++)
            {
                colB[i] = Convert.ToInt32(dataGridView1.Rows[i].Cells[5].Value);


            }
            //  ftp = colB.Max() / 100;

            ftp = colB.Max();
        }

如果有人能给我一些很棒的例子。

基本上只需要一些简单的计算测试

Answer 1

我们告诉你这样做：

// New method, not depending on a gridview. Testable.
public float calcNP_pure(int[] colB)
{
    float[] NP = new float[colB.Length];
    float avgNP = 0;

    float min = colB.Min();
    float max = colB.Max();
    float a = 1, b = 10;

    for (int i = 0; i < rowcount; i++)
    {
        NP[i] = (a + (colB[i] - min) * (b - a)) / (max - min);
        avgNP = NP[i] + avgNP;
    }

    avgNP = (avgNP / rowcount) * 100;
    return avgNP;
}

// Not testable
public float calcNP()
{
    int rowcount = dataGridView1.Rows.Count;
    int[] colB = new int[rowcount];
    for (int i = 0; i < rowcount; i++)
    {
        colB[i] = Convert.ToInt32(dataGridView1.Rows[i].Cells[5].Value);
    }
    return calcNP_pure(colB);
}

这个新方法也应该进入一个新类，而不是坐在表单或其他UI元素上。最佳实践是针对接口进行编程并将所需的依赖项注入对象：

public interface INpCalculator
{
    float CalcNP(int[] values);
}

public class NpCalculator : INpCalculator
{
    public float CalcNP(int[] values)
    {
        ...
        return ...;
    }
}   

public partial class Form1 : Form
{
    private INpCalculator _npCalculator;

    public Form1(INpCalculator npCalculator)
    {
        InitializeComponent();
        _npCalculator = npCalculator;
    }

    private float CalcNP()
    {
        int[] colB = dataGridView1.Rows
            .Cast<DataGridViewRow>()
            .Select(row => row.Cells[5].Value)
            .ToArray();
        return _npCalculator.CalcNP(colB);
    }
}

现在计算器是可测试的，无需打开任何形式：

[TestMethod]
public void TestNpCalculator()
{
    // Arrange
    var sut = new NpCalculator();
    var values = new int[] { 12, 7, 15, 3 };

    // Act
    float result = sut.CalcNP(values);


    // Assert
    Assert.AreEqual(123.456f, result);
}

顺便说一句：sut代表＆＃34;正在测试的系统＆＃34;。

Answer 2

在该方法的当前状态下，您的单元测试将需要手动创建datagrid对象并根据您的测试场景填充值。正如Daniel所建议的那样，你的方法“public float calcNP（）”不应该使用数据网格，而是你可以将一个整数数组传递给方法（只传递你将在计算中使用的值）

单元测试这些方法？

2 个答案: