Thanks for your comment Weq.
NSubstitute, AutoFixture and FluentAssertions are all excellent tools – especially FluentAssertions which I will be writing a blog about soon. I used Moq here as it is generally well known and I didn’t want to confuse or detract from the main article.

I would usually use bespoke builders over autofixture though as I find them more specific and they allow me to quickly (and legibly) create expected classes for comparison against returned classes in a test. I use FluentAssertions to make the comparison.

Darren

NSubstitute
AutoFixture
FluentAssertions

var id = testparam;
var customer = new Fixture().Create();
var mockRepo = Substitute.For();
mockRepo.GetById(id).Returns(customer)

var sut = new Sut(mockRepo);
var result = sut.Action();

result.Should.Be(customer, “the customer should be located”);