我读过有关单元测试的文章，也听过很多其他人吹嘘它的实用性，并且希望看到它的实际应用。因此，我从我创建的一个简单应用程序中选择了这个基本类。我不知道测试对我有何帮助，我希望你们中的一位能够通过指出可以测试此代码的哪些部分以及这些测试可能是什么样子来帮助我看到它的好处。那么，我将如何为以下代码编写单元测试？

public class Hole : INotifyPropertyChanged
{
    #region Field Definitions
    private double _AbsX;
    private double _AbsY;
    private double _CanvasX { get; set; }
    private double _CanvasY { get; set; }
    private bool _Visible;
    private double _HoleDia = 20;
    private HoleTypes _HoleType;
    private int _HoleNumber;
    private double _StrokeThickness = 1;
    private Brush _StrokeColor = new SolidColorBrush(Colors.Black);
    private HolePattern _ParentPattern;
    #endregion

    public enum HoleTypes { Drilled, Tapped, CounterBored, CounterSunk };
    public Ellipse HoleEntity = new Ellipse();
    public Ellipse HoleDecorator = new Ellipse();
    public TextBlock HoleLabel = new TextBlock();

    private static DoubleCollection HiddenLinePattern = 
               new DoubleCollection(new double[] { 5, 5 });

    public int HoleNumber
    {
        get
         {
            return _HoleNumber;
         }
        set
        {
            _HoleNumber = value;
            HoleLabel.Text = value.ToString();
            NotifyPropertyChanged("HoleNumber");
        }
    }
    public double HoleLabelX { get; set; }
    public double HoleLabelY { get; set; }
    public string AbsXDisplay { get; set; }
    public string AbsYDisplay { get; set; }

    public event PropertyChangedEventHandler PropertyChanged;
    //public event MouseEventHandler MouseActivity;

    // Constructor
    public Hole()
    {
        //_HoleDia = 20.0;
        _Visible = true;
        //this.ParentPattern = WhoIsTheParent;
        HoleEntity.Tag = this;
        HoleEntity.Width = _HoleDia;
        HoleEntity.Height = _HoleDia;

        HoleDecorator.Tag = this;
        HoleDecorator.Width = 0;
        HoleDecorator.Height = 0;


        //HoleLabel.Text = x.ToString();
        HoleLabel.TextAlignment = TextAlignment.Center;
        HoleLabel.Foreground = new SolidColorBrush(Colors.White);
        HoleLabel.FontSize = 12;

        this.StrokeThickness = _StrokeThickness;
        this.StrokeColor = _StrokeColor;
        //HoleEntity.Stroke = Brushes.Black;
        //HoleDecorator.Stroke = HoleEntity.Stroke;
        //HoleDecorator.StrokeThickness = HoleEntity.StrokeThickness;
        //HiddenLinePattern=DoubleCollection(new double[]{5, 5});
    }

    public void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, 
                       new PropertyChangedEventArgs(info));
        }
    }

    #region Properties
    public HolePattern ParentPattern
    {
        get
        {
            return _ParentPattern;
        }
        set
        {
            _ParentPattern = value;
        }
    }

    public bool Visible
    {
        get { return _Visible; }
        set
        {
            _Visible = value;
            HoleEntity.Visibility = value ? 
             Visibility.Visible : 
             Visibility.Collapsed;
            HoleDecorator.Visibility = HoleEntity.Visibility;
            SetCoordDisplayValues();
            NotifyPropertyChanged("Visible");
        }
    }

    public double AbsX
    {
        get { return _AbsX; }
        set
        {
            _AbsX = value;
            SetCoordDisplayValues();
            NotifyPropertyChanged("AbsX");
        }
    }

    public double AbsY
    {
        get { return _AbsY; }
        set
        {
            _AbsY = value;
            SetCoordDisplayValues();
            NotifyPropertyChanged("AbsY");
        }
    }

    private void SetCoordDisplayValues()
    {
        AbsXDisplay = HoleEntity.Visibility == 
        Visibility.Visible ? String.Format("{0:f4}", _AbsX) : "";
        AbsYDisplay = HoleEntity.Visibility == 
        Visibility.Visible ? String.Format("{0:f4}", _AbsY) : "";
        NotifyPropertyChanged("AbsXDisplay");
        NotifyPropertyChanged("AbsYDisplay");
    }

    public double CanvasX
    {
        get { return _CanvasX; }
        set
        {
            if (value == _CanvasX) { return; }
            _CanvasX = value;
            UpdateEntities();
            NotifyPropertyChanged("CanvasX");
        }
    }

    public double CanvasY
    {
        get { return _CanvasY; }
        set
        {
            if (value == _CanvasY) { return; }
            _CanvasY = value;
            UpdateEntities();
            NotifyPropertyChanged("CanvasY");
        }
    }

    public HoleTypes HoleType
    {
        get { return _HoleType; }
        set
        {
            if (value != _HoleType)
            {
                _HoleType = value;
                UpdateHoleType();
                NotifyPropertyChanged("HoleType");
            }
        }
    }

    public double HoleDia
    {
        get { return _HoleDia; }
        set
        {
            if (value != _HoleDia)
            {
                _HoleDia = value;
                HoleEntity.Width = value;
                HoleEntity.Height = value;
                UpdateHoleType(); 
                NotifyPropertyChanged("HoleDia");
            }
        }
    }

    public double StrokeThickness
    {
        get { return _StrokeThickness; }
        //Setting this StrokeThickness will also set Decorator
        set
        {
            _StrokeThickness = value;
            this.HoleEntity.StrokeThickness = value;
            this.HoleDecorator.StrokeThickness = value;
            NotifyPropertyChanged("StrokeThickness");
        }
    }

    public Brush StrokeColor
    {
        get { return _StrokeColor; }
        //Setting this StrokeThickness will also set Decorator
        set
        {
            _StrokeColor = value;
            this.HoleEntity.Stroke = value;
            this.HoleDecorator.Stroke = value;
            NotifyPropertyChanged("StrokeColor");
        }
    }

    #endregion

    #region Methods

    private void UpdateEntities()
    {
        //-- Update Margins for graph positioning
        HoleEntity.Margin = new Thickness
        (CanvasX - HoleDia / 2, CanvasY - HoleDia / 2, 0, 0);
        HoleDecorator.Margin = new Thickness
        (CanvasX - HoleDecorator.Width / 2, 
         CanvasY - HoleDecorator.Width / 2, 0, 0);
        HoleLabel.Margin = new Thickness
        ((CanvasX * 1.0) - HoleLabel.FontSize * .3, 
         (CanvasY * 1.0) - HoleLabel.FontSize * .6, 0, 0);
    }

    private void UpdateHoleType()
    {
        switch (this.HoleType)
        {
            case HoleTypes.Drilled: //Drilled only
                HoleDecorator.Visibility = Visibility.Collapsed;
                break;
            case HoleTypes.Tapped: // Drilled & Tapped
                HoleDecorator.Visibility = (this.Visible == true) ? 
                Visibility.Visible : Visibility.Collapsed;
                HoleDecorator.Width = HoleEntity.Width * 1.2;
                HoleDecorator.Height = HoleDecorator.Width;
                HoleDecorator.StrokeDashArray = 
                LinePatterns.HiddenLinePattern(1);
                break;
            case HoleTypes.CounterBored: // Drilled & CounterBored
                HoleDecorator.Visibility = (this.Visible == true) ? 
                Visibility.Visible : Visibility.Collapsed;
                HoleDecorator.Width = HoleEntity.Width * 1.5;
                HoleDecorator.Height = HoleDecorator.Width;
                HoleDecorator.StrokeDashArray = null;
                break;
            case HoleTypes.CounterSunk: // Drilled & CounterSunk
                HoleDecorator.Visibility = (this.Visible == true) ? 
                Visibility.Visible : Visibility.Collapsed;
                HoleDecorator.Width = HoleEntity.Width * 1.8;
                HoleDecorator.Height = HoleDecorator.Width;
                HoleDecorator.StrokeDashArray = null;
                break;
        }
        UpdateEntities();
    }

    #endregion

}

最佳答案

单元测试示例:

• 验证是否使用正确的事件参数触发了 PropertyChanged 事件。 在测试中使用反射来迭代所有设置值的属性并检查事件。

通常这是通过测试框架完成的，例如 NUnit .

(有点有趣，因为您会注意到 ParentPattern 属性不会触发事件。)

关于c# - 练习示例测试 C# 代码，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/616414/