C# and .NET Core Test-Driven Development

Callbacks

Using the Callback method of Moq, you can specify the callback to be invoked before and after a method is called. There are some test scenarios that might not be easily tested using the simple mock expectations. In such complex scenarios, you can use a callback to execute specific actions when the mock objects are called. The Callback method accepts an action parameter, which will be executed based on whether the callback is set up before or after the method invocation. The action can be an expression to be evaluated or another method to be called.

For example, you can have a callback set up to change the data after a specific method has been called. This feature allows you to create tests that offer more flexibility while simplifying ...