如何在Autofixture中使用RandomRangedNumberCustomization來確保參數在一定範圍內？

Question

我已經表明一類，它有兩個參數：

public double X { get; private set; } 

    public double Y { get; private set; } 

    public Point(double x, double y) 
    { 
     if (x > 90 || x < -90) 
      throw new ArgumentOutOfRangeException("latitude"); 

     if (y > 180 || y < -180) 
      throw new ArgumentOutOfRangeException("longitude"); 

     X = x; 
     Y = y; 
    } 

相應的屬性在構造函數中設置，所以我需要告訴AutoFixture創建與範圍內的參數點類作爲中後衛的規定條款。我設法弄亂了RandomRangedNumberCustomization類的用法。我做了以下內容：

 var xRange = new RangedNumberRequest(typeof(double), -90.0, 90.0); 
     var yRange = new RangedNumberRequest(typeof (double), -180.0, 180.0); 
     var dummyContext = new DelegatingSpecimenContext(); 
     var generator = new RandomRangedNumberGenerator(); 
     var x = (double)generator.Create(latitudeRange, dummyContext); 
     var y = (double) generator.Create(longitudeRange, dummyContext); 

將在我的範圍內產生的數字，所以我可以創造一個點，並在這些生成的數字飼料，但我錯過在定製方面的東西。任何幫助和/或指導將不勝感激。

謝謝！

Answer 1

由尼科斯Baxevanis建議的解決方案

除此之外，這裏的另一種選擇。你可以實現一個約定，一直負責處理Point在一個特定的方式x和y參數：

public class PointCustomization : ICustomization 
{ 
    public void Customize(IFixture fixture) 
    { 
     fixture.Customizations.Add(new XBuilder()); 
     fixture.Customizations.Add(new YBuilder()); 
    } 

    private class XBuilder : ISpecimenBuilder 
    { 
     public object Create(object request, ISpecimenContext context) 
     { 
      var pi = request as ParameterInfo; 
      if (pi == null || 
       pi.Name != "x" || 
       pi.Member.DeclaringType != typeof(Point)) 
       return new NoSpecimen(request); 

      return context.Resolve(
       new RangedNumberRequest(typeof(double), -90d, 90d)); 
     } 
    } 

    private class YBuilder : ISpecimenBuilder 
    { 
     public object Create(object request, ISpecimenContext context) 
     { 
      var pi = request as ParameterInfo; 
      if (pi == null || 
       pi.Name != "y" || 
       pi.Member.DeclaringType != typeof(Point)) 
       return new NoSpecimen(request); 

      return context.Resolve(
       new RangedNumberRequest(typeof(double), -180d, 180d)); 
     } 
    } 
} 

（有空間在上面的代碼重構）

鑑於PointCustomization，這個測試通過：

[Fact] 
public void CreatePointDoesNotThrow() 
{ 
    var fixture = new Fixture().Customize(new PointCustomization()); 
    var e = Record.Exception(() => fixture.Create<Point>()); 
    Assert.Null(e); 
} 

Answer 2

應該有幾種自定義AutoFixture的方法。 - 這裏是他們幾個：

隨着數據註釋

public class Point 
{ 
    public double X { get; private set; } 
    public double Y { get; private set; } 

    public Point(
     [Range(-90, 90)]double x, 
     [Range(-180, 180)]double y) 
    { 
     if (x > 90 || x < -90) 
      throw new ArgumentOutOfRangeException("latitude"); 

     if (y > 180 || y < -180) 
      throw new ArgumentOutOfRangeException("longitude"); 

     this.X = x; 
     this.Y = y; 
    } 
} 

[Fact] 
public void CreatePointDoesNotThrow() 
{ 
    var fixture = new Fixture(); 
    Assert.DoesNotThrow(() => fixture.Create<Point>()); // Passes. 
} 

搭配發電機

public class Point 
{ 
    public double X { get; private set; } 
    public double Y { get; private set; } 

    public Point(double x, double y) 
    { 
     if (x > 90 || x < -90) 
      throw new ArgumentOutOfRangeException("latitude"); 

     if (y > 180 || y < -180) 
      throw new ArgumentOutOfRangeException("longitude"); 

     this.X = x; 
     this.Y = y; 
    } 
} 

[Fact] 
public void CreatePointDoesNotThrow() 
{ 
    var fixture = new Fixture(); 
    var x = new Generator<int>(fixture).First(pt => pt > -90 && pt < 90); 
    var y = new Generator<int>(fixture).First(pt => pt > -180 && pt < 180); 
    fixture.Customize<Point>(c => c 
     .FromFactory(() => new Point(x, y))); 

    Assert.DoesNotThrow(() => fixture.Create<Point>()); // Passes. 
}