FluentAssertions Should().BeEquivalentTo() 失败，列表包含 运行-time 指定类型，派生自相同的接口
FluentAssertions Should().BeEquivalentTo() fails with Lists containing run-time specified types deriving from identical interface
我有以下测试说明了我试图实现的一个简单示例（两个等效列表的比较）：
[Fact]
public void Test()
{
// Arrange
var list1 = new List<IDomainEvent> { new BusinessCreatedDomainEvent { Name = "Microsoft" } };
var list2 = new List<IDomainEvent> { new BusinessCreatedDomainEvent { Name = "Microsoft" } };
// Act
// Assert
list1.Should().BeEquivalentTo(list2);
}
理想情况下，每个列表应该能够包含从 IDomainEvent 接口派生的任意数量的不同类型的项目。目前测试失败。我怀疑它与 Should().BeEquivalentTo 不适合比较 运行 时间指定的类型有关。我如何配置这个例子，以便测试通过？
目前测试结果为：
[8/14/2018 5:21:26 PM Error] [xUnit.net 00:00:00.7909767] BusinessWrite.UnitTests.Infrastructure.EventStoreUnitTests.Test [FAIL]
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7922005] System.InvalidOperationException : No members were found for comparison. Please specify some members to include in the comparison or choose a more meaningful assertion.
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7932461] Stack Trace:
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7941986] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Equivalency\GenericEnumerableEquivalencyStep.cs(74,0): at FluentAssertions.Equivalency.GenericEnumerableEquivalencyStep.Handle(IEquivalencyValidationContext context, IEquivalencyValidator parent, IEquivalencyAssertionOptions config)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7945426] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Equivalency\EquivalencyValidator.cs(85,0): at FluentAssertions.Equivalency.EquivalencyValidator.AssertEqualityUsing(IEquivalencyValidationContext context)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7946187] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Equivalency\EquivalencyValidator.cs(38,0): at FluentAssertions.Equivalency.EquivalencyValidator.AssertEquality(EquivalencyValidationContext context)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7946610] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Collections\CollectionAssertions.cs(394,0): at FluentAssertions.Collections.CollectionAssertions`2.BeEquivalentTo[TExpectation](IEnumerable`1 expectation, Func`2 config, String because, Object[] becauseArgs)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7947629] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Collections\CollectionAssertions.cs(331,0): at FluentAssertions.Collections.CollectionAssertions`2.BeEquivalentTo[TExpectation](IEnumerable`1 expectation, String because, Object[] becauseArgs)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7948569] C:\Users\Christian\source\repos\unify\src\Services\Business\BusinessWrite\BusinessWrite.UnitTests\Infrastructure\EventStoreUnitTests.cs(43,0): at BusinessWrite.UnitTests.Infrastructure.EventStoreUnitTests.Test()
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.8058517] Finished: BusinessWrite.UnitTests
我怀疑接口 IDomainEvent 没有任何 public 属性。
这解释了您看到的异常，因为 BeEquivalentTo() 中的逻辑使用 IDomainEvent 上的属性，因为列表的类型为 List<IDomainEvent>.
要使用 BusinessCreatedDomainEvent 上的属性比较两个列表，您可以改用
list1.Should().BeEquivalentTo(list2, options => options.RespectingRuntimeTypes());
By default, Fluent Assertions respects an object’s or member’s declared (compile-time) type when selecting members to process during a recursive comparison. That is to say if the subject is a OrderDto but the variable it is assigned to has type Dto only the members defined by the latter class would be considered when comparing the object to the order variable. This behavior can be configured and you can choose to use run-time types if you prefer:
我有以下测试说明了我试图实现的一个简单示例（两个等效列表的比较）：
[Fact]
public void Test()
{
// Arrange
var list1 = new List<IDomainEvent> { new BusinessCreatedDomainEvent { Name = "Microsoft" } };
var list2 = new List<IDomainEvent> { new BusinessCreatedDomainEvent { Name = "Microsoft" } };
// Act
// Assert
list1.Should().BeEquivalentTo(list2);
}
理想情况下，每个列表应该能够包含从 IDomainEvent 接口派生的任意数量的不同类型的项目。目前测试失败。我怀疑它与 Should().BeEquivalentTo 不适合比较 运行 时间指定的类型有关。我如何配置这个例子，以便测试通过？
目前测试结果为：
[8/14/2018 5:21:26 PM Error] [xUnit.net 00:00:00.7909767] BusinessWrite.UnitTests.Infrastructure.EventStoreUnitTests.Test [FAIL]
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7922005] System.InvalidOperationException : No members were found for comparison. Please specify some members to include in the comparison or choose a more meaningful assertion.
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7932461] Stack Trace:
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7941986] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Equivalency\GenericEnumerableEquivalencyStep.cs(74,0): at FluentAssertions.Equivalency.GenericEnumerableEquivalencyStep.Handle(IEquivalencyValidationContext context, IEquivalencyValidator parent, IEquivalencyAssertionOptions config)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7945426] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Equivalency\EquivalencyValidator.cs(85,0): at FluentAssertions.Equivalency.EquivalencyValidator.AssertEqualityUsing(IEquivalencyValidationContext context)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7946187] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Equivalency\EquivalencyValidator.cs(38,0): at FluentAssertions.Equivalency.EquivalencyValidator.AssertEquality(EquivalencyValidationContext context)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7946610] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Collections\CollectionAssertions.cs(394,0): at FluentAssertions.Collections.CollectionAssertions`2.BeEquivalentTo[TExpectation](IEnumerable`1 expectation, Func`2 config, String because, Object[] becauseArgs)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7947629] C:\projects\fluentassertions-vf06b\Src\FluentAssertions\Collections\CollectionAssertions.cs(331,0): at FluentAssertions.Collections.CollectionAssertions`2.BeEquivalentTo[TExpectation](IEnumerable`1 expectation, String because, Object[] becauseArgs)
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.7948569] C:\Users\Christian\source\repos\unify\src\Services\Business\BusinessWrite\BusinessWrite.UnitTests\Infrastructure\EventStoreUnitTests.cs(43,0): at BusinessWrite.UnitTests.Infrastructure.EventStoreUnitTests.Test()
[8/14/2018 5:21:26 PM Informational] [xUnit.net 00:00:00.8058517] Finished: BusinessWrite.UnitTests
我怀疑接口 IDomainEvent 没有任何 public 属性。
这解释了您看到的异常，因为 BeEquivalentTo() 中的逻辑使用 IDomainEvent 上的属性，因为列表的类型为 List<IDomainEvent>.
要使用 BusinessCreatedDomainEvent 上的属性比较两个列表，您可以改用
list1.Should().BeEquivalentTo(list2, options => options.RespectingRuntimeTypes());
By default, Fluent Assertions respects an object’s or member’s declared (compile-time) type when selecting members to process during a recursive comparison. That is to say if the subject is a OrderDto but the variable it is assigned to has type Dto only the members defined by the latter class would be considered when comparing the object to the order variable. This behavior can be configured and you can choose to use run-time types if you prefer: