NUnit: Assert collection has item with specific property value

Question

I'm using NUnit to assert that a service is properly added to the IServiceCollection in ASP.Net core.

I'm trying to make sure the servicecollection has one ServiceDescriptor with ServiceType of type MyClass . How would I rewrite this assertion in NUnit syntax?

IServiceCollection collection = ...;
Assert.NotNull(collection.SingleOrDefault(sd => sd.ServiceType == typeof(MyService)));

I assume it would look something like this:

Assert.That(collection, Has.One.?????);

Answer 1

You want

Assert.That(collection, Has.One.With.Property("ServiceType").EqualTo(typeof(MyService)));

The "With" is optional but seems to make it read better.