Learn how to write effective C# unit tests with mocking for a real-world application in this 26-minute video tutorial. Explore the process of creating order mocks, implementing service mocking, and testing checkout dependencies. Dive into property testing, order placement, and creating order references. Discover techniques for sending email requests, handling full order cards, and crafting email messages. Embrace test-driven development principles while testing with email and interfaces. Master the art of injecting services to create robust and maintainable unit tests for your C# projects.