c# - Fluent Assertions - Overriding comparison in ShouldBeEquivalentTo() -

i have following dto:

public class dto {     public datetime date { get; set; } } 

and i'm trying override comparison of property using syntax per fa wiki:

public void override_test() {     // arrange     var actual = new dto { date = datetime.now };     var expected = new dto { date = datetime.now };      // act      // assert     actual.shouldbeequivalentto(expected, options =>          options.using<datetime>(x => x.subject.should().becloseto(datetime.now))); } 

but test not compile. error:

cannot implicitly convert type 'fluentassertions.equivalency.equivalencyassertionoptions<fluentassertions.shouldbeequivalentto.override.dto>.restriction<system.datetime>' 'fluentassertions.equivalency.equivalencyassertionoptions<fluentassertions.shouldbeequivalentto.override.dto>' 

can advise correct syntax?

you have tell fa when use using construction using whentypeis<datetime>(). in other words:

actual.shouldbeequivalentto(expected, options =>      options.using<datetime>(x => x.subject.should().becloseto(datetime.now)).whentypeis<datetime>()); 

however, suggest not rely on datetime.now much. instead, consider using ayende rahien has proposed in this article.