Moq and NSubstitute

.NET libraries for creating mocks.

What is NSubstitute?

NSubstitute is a .NET library for creating mocks from interfaces.

var email = Substitute.For<IEmailSender>();
new OrderService(email).Place(order);
email.Received(1).Send(Arg.Any<Message>());

Level: Journeyman · More C# terms at this level

Updated October 15, 2026