Two Ways to Count the Number of Times a Mocked Method is Called With Moq

Two approaches for counting how many times a mocked method is called using the Moq library in C#. The first uses Moq's built-in `Verify` method with `Times.Exactly()`, which is purpose-built for this scenario. The second uses the `Callback` method to manually increment a counter and then assert its value. Both approaches support `It.IsAny<>` for flexible parameter matching.