dotnet-testing-nsubstitute-mocking

What problem does it solve?

This skill teaches how to use NSubstitute to create and manage test doubles (mocks, stubs, spies) to isolate dependencies, control behavior, and verify interactions in unit tests.

Core Features & Use Cases

• Substitute.For: create interface or class substitutes for isolation.
• Returns/Received/Throws: configure return values, verify calls, and throw exceptions.
• Test Double Patterns: dummy, stub, fake, spy, and mock exemplified with representative examples.
• Use Case: validate a service's behavior without real dependencies in a xUnit-based project.

Quick Start

Install the required NuGet packages in your test project (NSubstitute, xUnit, Microsoft.Extensions.Logging) and adapt the examples to your domain models.