C# 如何在FluentAssertions的集合断言中重用自定义对象断言
我已经看完了页面,但我仍然无法理解如何为对象集合创建一个C# 如何在FluentAssertions的集合断言中重用自定义对象断言,c#,automated-tests,fluent-assertions,C#,Automated Tests,Fluent Assertions,我已经看完了页面,但我仍然无法理解如何为对象集合创建一个Should().beequivalento()比较方法,如果我已经为一个对象实现了Should().beequivalento(),同时为同一个集合保留所有其他断言方法 以下是一个简化的示例: 我要检查的类: public class CalculationResult { public DateTime Date { get; set; } public int Id { get; set; } public b
Should().beequivalento()
比较方法,如果我已经为一个对象实现了Should().beequivalento()
,同时为同一个集合保留所有其他断言方法
以下是一个简化的示例:
我要检查的类:
public class CalculationResult
{
public DateTime Date { get; set; }
public int Id { get; set; }
public bool CalcState { get; set; }
public double Result { get; set; }
}
类I转换Specflow测试套件中的表行
public class CalcResultBdd
{
public DateTime Date { get; set; }
public double Result { get; set; }
}
类对类比较类为:
public class CalculationResultAssertions : ReferenceTypeAssertions<CalculationResult, CalculationResultAssertions>
{
public CalculationResultAssertions(CalculationResult instance)
{
Subject = instance;
}
protected override string Identifier => "CalculationResult";
[CustomAssertion]
public AndConstraint<CalculationResultAssertions> BeEquivalentTo(
CalcResultBdd expectedResult,
double precision = 0.001,
string because = "",
params object[] becauseArgs)
{
Execute.Assertion.
BecauseOf(because, becauseArgs).
ForCondition(expectedResult != null).
FailWith("You cannot assert that calculation result is correct if you do not pass a proper object").
Then.
ForCondition(precision >= 0).
FailWith("You cannot compare double values if you provide negative precision").
Then.
Given(() => Subject).
ForCondition(s => s.CalcState).
FailWith("Expected CalcState to be \"true\"").
Then.
ForCondition(s => s.Date == expectedResult.Date).
FailWith(
"Expected Date to be {0}{reason}, but found {1}",
_ => expectedResult.Date.ToString("yyyy-MM-dd"),
s => s.Date.ToString("yyyy-MM-dd")).
Then.
ForCondition(s => Math.Abs(s.Result - expectedResult.Result) <= precision).
FailWith(
"Expected Result to be {0} with precision {1}{reason}, but found {2}",
_ => expectedResult.Result,
_ => precision,
s => s.Result);
return new AndConstraint<CalculationResultAssertions>(this);
}
}
如果我运行以下命令,而不重新定义列表的beequivalento
列出实际结果=/*在此处获取结果*/
actualResults.Should().BeeEquivalentTo(新的CalcResultBdd[]{/*此处的预期结果*/})
FluentAssertions将使用内置结构比较,而不是自定义比较。我是否可以更改代码中的某些内容,以便Fluent断言使用自定义比较?如果我没有弄错的话,BeEquivalentTo
扩展方法是通用的,也将取代您的方法 我想你是对的。FluentAssertions库不会从库外部查找自定义比较实现(Be
,或beequivalento
)。或者我完全错过了在库中注册自定义实现的方法,没有注册任何东西的概念。这一切都依赖于编译器选择正确的重载。
public static class AssertionExtensions
{
public static CalculationResultAssertions Should(this CalculationResult instance)
{
return new CalculationResultAssertions(instance);
}
}
List<CalculationResult> actualResults = /* getting results here */
actualResults.Should().BeEquivalentTo(new CalcResultBdd[] { /* expected results here */ })