提供 FluentAssertions 的扩展

Question

因为我有一些角度，所以我想检查角度模数 360\xc2\xb0：

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    double angle = 0;\n    double expectedAngle = 360;\n    angle.Should().BeApproximatelyModulus360(expectedAngle, 0.01);\n

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我已经按照教程编写了 Fluent Assertions 框架的扩展：https ://fluentassertions.com/extensibility/

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public static class DoubleExtensions\n{\n  public static DoubleAssertions Should(this double d)\n  {\n    return new DoubleAssertions(d);\n  }\n}\n\n\npublic class DoubleAssertions : NumericAssertions<double>\n{\n  public DoubleAssertions(double d) : base(d)\n  {\n  }\n  public AndConstraint<DoubleAssertions> BeApproximatelyModulus360(\n      double targetValue, double precision, string because = "", params object[] becauseArgs)\n  {\n    Execute.Assertion\n        .Given(() => Subject)\n        .ForCondition(v => MathHelper.AreCloseEnoughModulus360(targetValue, (double)v, precision))\n        .FailWith($"Expected value {Subject}] should be approximatively {targetValue} with {precision} modulus 360");\n    return new AndConstraint<DoubleAssertions>(this);\n}\n

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当我使用这两个命名空间时：

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using FluentAssertions;\nusing MyProjectAssertions;\n

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因为我也使用：

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 aDouble.Should().BeApproximately(1, 0.001);\n

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我收到以下编译错误：\nAmbiguous call between \'FluentAssertions.AssertionExtensions.Should(double)\' and \'MyProjectAssertions.DoubleExtensions.Should(double)\'

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如何更改我的代码以扩展标准 NumericAssertions （或其他合适的类）以使我的BeApproximatelyModulus360下一个符合标准BeApproximately？

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谢谢

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Answer 1

如果您想直接访问对象上的扩展方法double，而不是DoubleAssertion对象上的扩展方法，为什么还要引入甚至创建新类型的复杂性DoubleAssertion。相反，直接为 定义扩展方法NumericAssertions<double>。

  public static class DoubleAssertionsExtensions
    {
        public static AndConstraint<NumericAssertions<double>> BeApproximatelyModulus360(this NumericAssertions<double> parent,
            double targetValue, double precision, string because = "", params object[] becauseArgs)
        {
            Execute.Assertion
                .Given(() => parent.Subject)
                .ForCondition(v => MathHelper.AreCloseEnoughModulus360(targetValue, (double)v, precision))
                .FailWith(
                    $"Expected value {parent.Subject}] should be approximatively {targetValue} with {precision} modulus 360");
            return new AndConstraint<NumericAssertions<double>>(parent);
        }
    }

然后你可以一起使用它们。

 public class Test
    {
        public Test()
        {
            double aDouble = 4;

            aDouble.Should().BeApproximately(1, 0.001);
            aDouble.Should().BeApproximatelyModulus360(0, 0.1);

        }
    }