How to combine conditions for multiple subproperties when using NUnit Assert?

Question

I'm asserting the content of a resulting array and I want to make sure the contained object respects all my specifications. The object has two different nested objects.

I'm unable to assert the content of the nested objects in a single command.

This is what I got

Assert.That(sut.FutureInstances, Has.Exactly(1).InstanceOf<CourseInstanceSummary>().With
    .Property(nameof(CourseInstanceSummary.Id)).EqualTo(courseInstance.Id).And
    .Property(nameof(CourseInstanceSummary.StartDate)).EqualTo(courseInstance.StartDate).And
    .Property(nameof(CourseInstanceSummary.TrainingMode)).EqualTo(courseInstance.TrainingMode).And
    .Property(nameof(CourseInstanceSummary.TotalSeats)).EqualTo(courseInstance.TotalSeats).And
    .Property(nameof(CourseInstanceSummary.Participants)).EqualTo(courseInstance.Participants).And
    .Property(nameof(CourseInstanceSummary.Room)).With
        .Property(nameof(CourseInstanceSummary.RoomSummary.Id)).EqualTo(courseInstance.Room!.Id).And
        .Property(nameof(CourseInstanceSummary.RoomSummary.Name)).EqualTo(courseInstance.Room!.Name)
);

Assert.That(sut.FutureInstances, Has.Exactly(1).InstanceOf<CourseInstanceSummary>().With
    .Property(nameof(CourseInstanceSummary.Id)).EqualTo(courseInstance.Id).And
    .Property(nameof(CourseInstanceSummary.StartDate)).EqualTo(courseInstance.StartDate).And
    .Property(nameof(CourseInstanceSummary.TrainingMode)).EqualTo(courseInstance.TrainingMode).And
    .Property(nameof(CourseInstanceSummary.TotalSeats)).EqualTo(courseInstance.TotalSeats).And
    .Property(nameof(CourseInstanceSummary.Participants)).EqualTo(courseInstance.Participants).And
    .Property(nameof(CourseInstanceSummary.Site)).With
        .Property(nameof(CourseInstanceSummary.SiteItem.Id)).EqualTo(courseInstance.Site!.Id).And
        .Property(nameof(CourseInstanceSummary.SiteItem.Name)).EqualTo(courseInstance.Site!.Name)
);

The two asserts are looking at the same object, so it would be cool if I could unify them.

Answer 1

You can try

NUnit.Framework.Constraints.Constraint roomConstraint = Has.Property(nameof(CourseInstanceSummary.Room)).With
    .Property(nameof(CourseInstanceSummary.RoomSummary.Id)).EqualTo(courseInstance.Room!.Id).And
    .Property(nameof(CourseInstanceSummary.RoomSummary.Name)).EqualTo(courseInstance.Room!.Name);

NUnit.Framework.Constraints.Constraint siteConstraint = Has.Property(nameof(CourseInstanceSummary.Site)).With
    .Property(nameof(CourseInstanceSummary.SiteItem.Id)).EqualTo(courseInstance.Site!.Id).And
    .Property(nameof(CourseInstanceSummary.SiteItem.Name)).EqualTo(courseInstance.Site!.Name)

then

Assert.That(sut.FutureInstances, Has.Exactly(1).InstanceOf<CourseInstanceSummary>().With
.Property(nameof(CourseInstanceSummary.Id)).EqualTo(courseInstance.Id).And
.Property(nameof(CourseInstanceSummary.StartDate)).EqualTo(courseInstance.StartDate).And
.Property(nameof(CourseInstanceSummary.TrainingMode)).EqualTo(courseInstance.TrainingMode).And
.Property(nameof(CourseInstanceSummary.TotalSeats)).EqualTo(courseInstance.TotalSeats).And
.Property(nameof(CourseInstanceSummary.Participants)).EqualTo(courseInstance.Participants).And
.Matches(roomConstraint).And
.Matches(siteConstraint)
);