Have you ever created test scenarios or automated checks for your code?

Yes, creating test scenarios and automated checks is an important practice for ensuring code quality.

In C#, frameworks like NUnit or MSTest are often used for this purpose. Here's a simple example of an automated test using NUnit:

using NUnit.Framework;

public class Calculator
{
    public int Add(int a, int b) => a + b;
}

[TestFixture]
public class CalculatorTests
{
    [Test]
    public void Add_WhenCalled_ReturnsSum()
    {
        var calculator = new Calculator();
        int result = calculator.Add(2, 3);
        Assert.AreEqual(5, result);
    }
}

This test allows for automatic verification that the Add method works correctly when code changes are made.